The Arduino Leonardo is a microcontroller board based on the ATmega32u4 (datasheet). It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board; these are detailed on the Getting started with the Arduino Leonardo.
Related Boards
If you are interested in boards with similar functionality, at Arduino you can find:
From the Tutorials section you can find examples from libraries and built-in sketches as well other useful information to expand your knowledge of the Arduino hardware and software.
Need Help?
Check the Arduino Forum for questions about the Arduino Language, or how to make your own Projects with Arduino. Need any help with your board please get in touch with the official Arduino User Support as explained in our Contact Us page.
Warranty
You can find here your board warranty information.
Technical Specifications
Microcontroller
ATmega32u4
Operating Voltage
5V
Input Voltage (Recommended)
7-12V
Input Voltage (limits)
6-20V
Digital I/O Pins
20
PWM Channels
7
Analog Input Channels
12
DC Current per I/O Pin
40 mA
DC Current for 3.3V Pin
50 mA
Flash Memory
32 KB (ATmega32u4) of which 4 KB used by bootloader
SRAM
2.5 KB (ATmega32u4)
EEPROM
1 KB (ATmega32u4)
Clock Speed
16 MHz
Lengh
68.6 mm
Width
53.3 mm
Weight
20 g
Documentation
OSH: Schematics
The Arduino Leonardo is open-source hardware! You can build your own board using the following files:
The Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. The power pins are as follows:
VIN. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.
3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.
GND. Ground pins.
IOREF. The voltage at which the i/o pins of the board are operating (i.e. VCC for the board). This is 5V on the Leonardo.
Memory
The ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).
Input and Output
Each of the 20 digital i/o pins on the Leonardo can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:
Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using theATmega32U4 hardware serial capability. Note that on the Leonardo, the Serial class refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use the Serial1 class.
TWI: 2 (SDA) and 3 (SCL). Support TWI communication using the Wire library.
External Interrupts: 3 (interrupt 0), 2 (interrupt 1), 0 (interrupt 2), 1 (interrupt 3) and 7 (interrupt 4). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.
PWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output with the analogWrite() function.
SPI: on the ICSP header. These pins support SPI communication using the SPI library. Note that the SPI pins are not connected to any of the digital I/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Leonardo's 6-pin ICSP header, the shield will not work.
LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
Analog Inputs: A0-A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function.
There are a couple of other pins on the board:
AREF. Reference voltage for the analog inputs. Used with analogReference().
Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.
The Leonardo has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). The 32U4 also allows for serial (CDC) communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB 2.0 device, using standard USB COM drivers. On Windows, a .inf file is required. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer (but not for serial communication on pins 0 and 1). A SoftwareSerial library allows for serial communication on any of the Leonardo's digital pins. The ATmega32U4 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the documentation for details. For SPI communication, use the SPI library. The Leonardo appears as a generic keyboard and mouse, and can be programmed to control these input devices using the Keyboard and Mouse classes.
Programming
The Leonardo can be programmed with the Arduino software (download). Select "Arduino Leonardo from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials. The ATmega32U4 on the Arduino Leonardo comes preburned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol. You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using Arduino ISP or similar; see these instructions for details.
Automatic (Software) Reset and Bootloader Initiation
Rather than requiring a physical press of the reset button before an upload, the Leonardo is designed in a way that allows it to be reset by software running on a connected computer. The reset is triggered when the Leonardo's virtual (CDC) serial / COM port is opened at 1200 baud and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial / COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Leonardo. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader. Because of the way the Leonardo handles reset it's best to let the Arduino software try to initiate the reset before uploading, especially if you are in the habit of pressing the reset button before uploading on other boards. If the software can't reset the board you can always start the bootloader by pressing the reset button on the board.
USB Overcurrent Protection
The Leonardo has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
Physical Characteristics
The maximum length and width of the Leonardo PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.
{"id":8939342135613,"title":"Arduino Leonardo without Headers","handle":"arduino-leonardo","description":"\u003cmeta charset=\"UTF-8\"\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel active\" id=\"product-details-information-tab-0\" data-action=\"pushable\" data-id=\"product-details-information-0\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\" itemprop=\"description\"\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-0\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ch1 style=\"text-align: center;\" data-mce-fragment=\"1\"\u003eArduino Leonardo without Headers\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Arduino Leonardo is a microcontroller board based on the ATmega32u4 (\u003ca href=\"http:\/\/www.atmel.com\/devices\/atmega32u4.aspx\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/www.atmel.com\/devices\/atmega32u4.aspx\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e). It has 20 digital input\/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial \/ COM port. It also has other implications for the behavior of the board; these are detailed on the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" target=\"_blank\"\u003eGetting started with the Arduino Leonardo.\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eRelated Boards\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIf you are interested in boards with similar functionality, at Arduino you can find:\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ca data-tabindex-counter=\"1\" data-tabindex-value=\"none\" href=\"https:\/\/store.arduino.cc\/products\/arduino-leonardo-with-headers\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/store.arduino.cc\/products\/arduino-leonardo-with-headers\" target=\"_blank\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eArduino Leonardo with Headers\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ca data-tabindex-counter=\"1\" data-tabindex-value=\"none\" href=\"https:\/\/store.arduino.cc\/products\/arduino-micro\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/store.arduino.cc\/products\/arduino-micro\" target=\"_blank\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eArduino Micro\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eGetting started\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFind inspiration for your projects with Leonardo board from our tutorial platform \u003ca href=\"https:\/\/create.arduino.cc\/projecthub?by=part\u0026amp;part_id=21297\u0026amp;sort=popular\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/create.arduino.cc\/projecthub?by=part\u0026amp;part_id=21297\u0026amp;sort=popular\" target=\"_blank\"\u003eProject Hub.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe \u003ca href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" target=\"_blank\"\u003eGetting started with the Arduino Leonardo\u003c\/a\u003epage contains all the information you need to configure your board, use the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\"\u003eArduino Software (IDE)\u003c\/a\u003e, and start tinkering with coding and electronics.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFrom the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage?from=Main.Tutorials\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage?from=Main.Tutorials\" target=\"_blank\"\u003eTutorials\u003c\/a\u003e section you can find examples from libraries and built-in sketches as well other useful information to expand your knowledge of the Arduino hardware and software.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eNeed Help?\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCheck the Arduino Forum for questions about the \u003ca href=\"https:\/\/forum.arduino.cc\/index.php?board=4.0\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/forum.arduino.cc\/index.php?board=4.0\" target=\"_blank\"\u003eArduino Language\u003c\/a\u003e, or how to make your own \u003ca href=\"https:\/\/forum.arduino.cc\/index.php?board=3.0\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/forum.arduino.cc\/index.php?board=3.0\" target=\"_blank\"\u003eProjects with Arduino\u003c\/a\u003e. Need any help with your board please get in touch with the official Arduino User Support as explained in our \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/ContactUs\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/ContactUs\" target=\"_blank\"\u003eContact Us\u003c\/a\u003e page.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou can find \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/warranty\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/warranty\" target=\"_blank\"\u003ehere\u003c\/a\u003e your board warranty information.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel\" id=\"product-details-information-tab-1\" data-action=\"pushable\" data-id=\"product-details-information-1\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\"\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003e \u003c\/h2\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-1\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ctable style=\"width: 70%;\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eMicrocontroller\u003c\/td\u003e\n\u003ctd style=\"width: 70%;\"\u003eATmega32u4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eInput Voltage (Recommended)\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e7-12V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eInput Voltage (limits)\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e6-20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eDigital I\/O Pins\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003ePWM Channels\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eAnalog Input Channels\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eDC Current per I\/O Pin\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e40 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eDC Current for 3.3V Pin\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e50 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eFlash Memory\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e32 KB (ATmega32u4) of which 4 KB used by bootloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eSRAM\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e2.5 KB (ATmega32u4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eEEPROM\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e1 KB (ATmega32u4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eClock Speed\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e16 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eLengh\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e68.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eWidth\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e53.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e20 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel\" id=\"product-details-information-tab-2\" data-action=\"pushable\" data-id=\"product-details-information-2\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\"\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003e \u003c\/h2\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003eDocumentation\u003c\/h2\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-2\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eOSH: Schematics\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Arduino Leonardo is open-source hardware! You can build your own board using the following files:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca class=\"resource eagle\" data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/content.arduino.cc\/assets\/Leonardo-reference.zip\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/content.arduino.cc\/assets\/Leonardo-reference.zip\"\u003eEagle Files\u003c\/a\u003e in .ZIP\u003c\/li\u003e\n\u003cli\u003e\n\u003ca class=\"resource schematics\" data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/content.arduino.cc\/assets\/Leonardo_Rev3d_sch.pdf\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/content.arduino.cc\/assets\/Leonardo_Rev3d_sch.pdf\"\u003eSchematics\u003c\/a\u003e in .PDF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePinout Diagram\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.png\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.png\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDownload the full pinout diagram as PDF \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.pdf\" tabindex=\"-1\" data-mce-fragment=\"1\" target=\"_blank\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.pdf\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel\" id=\"product-details-information-tab-3\" data-action=\"pushable\" data-id=\"product-details-information-3\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\"\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003eFAQ\u003c\/h2\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-3\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePower\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. \u003cbr data-mce-fragment=\"1\"\u003eExternal (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. \u003cbr data-mce-fragment=\"1\"\u003eThe power pins are as follows: \u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eVIN. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eGND. Ground pins.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eIOREF. The voltage at which the i\/o pins of the board are operating (i.e. VCC for the board). This is 5V on the Leonardo.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eMemory\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"http:\/\/www.arduino.cc\/en\/Reference\/EEPROM\" tabindex=\"-1\" data-mce-fragment=\"1\" target=\"_blank\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/www.arduino.cc\/en\/Reference\/EEPROM\"\u003eEEPROM library\u003c\/a\u003e). \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eInput and Output\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEach of the 20 digital i\/o pins on the Leonardo can be used as an input or output, using \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/PinMode\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/PinMode\" target=\"_blank\"\u003epinMode()\u003c\/a\u003e, \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalWrite\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalWrite\" target=\"_blank\"\u003edigitalWrite()\u003c\/a\u003e, and \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalRead\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalRead\" target=\"_blank\"\u003edigitalRead()\u003c\/a\u003e functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSerial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using theATmega32U4 hardware serial capability. Note that on the Leonardo, the Serial class refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use the Serial1 class.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eTWI: 2 (SDA) and 3 (SCL). Support TWI communication using the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" target=\"_blank\"\u003eWire library\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eExternal Interrupts: 3 (interrupt 0), 2 (interrupt 1), 0 (interrupt 2), 1 (interrupt 3) and 7 (interrupt 4). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AttachInterrupt\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AttachInterrupt\" target=\"_blank\"\u003eattachInterrupt()\u003c\/a\u003e function for details.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003ePWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output with the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogWrite\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogWrite\" target=\"_blank\"\u003eanalogWrite()\u003c\/a\u003e function.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSPI: on the ICSP header. These pins support SPI communication using the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" target=\"_blank\"\u003eSPI library\u003c\/a\u003e. Note that the SPI pins are not connected to any of the digital I\/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Leonardo's 6-pin ICSP header, the shield will not work.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eLED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAnalog Inputs: A0-A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i\/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i\/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\"\u003eanalogReference\u003c\/a\u003e() function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThere are a couple of other pins on the board:\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAREF. Reference voltage for the analog inputs. Used with \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\"\u003eanalogReference\u003c\/a\u003e().\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eReset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSee also the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Hacking\/PinMapping32u4\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Hacking\/PinMapping32u4\" target=\"_blank\"\u003emapping between Arduino pins and ATmega32u4 ports\u003c\/a\u003e. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eCommunication\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). The 32U4 also allows for serial (CDC) communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB 2.0 device, using standard USB COM drivers. \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"http:\/\/arduino.cc\/en\/Guide\/Windows#toc4\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/arduino.cc\/en\/Guide\/Windows#toc4\" target=\"_blank\"\u003eOn Windows, a .inf file is required\u003c\/a\u003e. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer (but not for serial communication on pins 0 and 1). A \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"http:\/\/www.arduino.cc\/en\/Reference\/SoftwareSerial\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/www.arduino.cc\/en\/Reference\/SoftwareSerial\" target=\"_blank\"\u003eSoftwareSerial library\u003c\/a\u003e allows for serial communication on any of the Leonardo's digital pins. The ATmega32U4 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" target=\"_blank\"\u003edocumentation\u003c\/a\u003e for details. For SPI communication, use the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" target=\"_blank\"\u003eSPI library\u003c\/a\u003e. The Leonardo appears as a generic keyboard and mouse, and can be programmed to control these input devices using the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/MouseKeyboard\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/MouseKeyboard\" target=\"_blank\"\u003eKeyboard and Mouse\u003c\/a\u003e classes. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eProgramming\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo can be programmed with the Arduino software (\u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\"\u003edownload\u003c\/a\u003e). Select \"Arduino Leonardo from the Tools \u0026gt; Board menu (according to the microcontroller on your board). For details, see the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/HomePage\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/HomePage\" target=\"_blank\"\u003ereference\u003c\/a\u003e and \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage\" target=\"_blank\"\u003etutorials\u003c\/a\u003e. The ATmega32U4 on the Arduino Leonardo comes preburned with a \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/Bootloader\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/Bootloader\" target=\"_blank\"\u003ebootloader\u003c\/a\u003e that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol. You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Main\/ArduinoISP\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/ArduinoISP\" target=\"_blank\"\u003eArduino ISP\u003c\/a\u003e or similar; see \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Programmer\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Programmer\" target=\"_blank\"\u003ethese instructions\u003c\/a\u003e for details. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eAutomatic (Software) Reset and Bootloader Initiation\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eRather than requiring a physical press of the reset button before an upload, the Leonardo is designed in a way that allows it to be reset by software running on a connected computer. The reset is triggered when the Leonardo's virtual (CDC) serial \/ COM port is opened at 1200 baud and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial \/ COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Leonardo. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader. \u003cbr data-mce-fragment=\"1\"\u003eBecause of the way the Leonardo handles reset it's best to let the Arduino software try to initiate the reset before uploading, especially if you are in the habit of pressing the reset button before uploading on other boards. If the software can't reset the board you can always start the bootloader by pressing the reset button on the board. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eUSB Overcurrent Protection\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePhysical Characteristics\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe maximum length and width of the Leonardo PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16\"), not an even multiple of the 100 mil spacing of the other pins.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","published_at":"2023-11-26T08:52:40+05:30","created_at":"2023-11-26T08:44:36+05:30","vendor":"ThinkRobotics","type":"","tags":["A000052","ARD-BRD","ARD1","ARDNO","Arduino","ATMEGA32U4","espressif","leonardo","microcontroller"],"price":209999,"price_min":209999,"price_max":209999,"available":true,"price_varies":false,"compare_at_price":599999,"compare_at_price_min":599999,"compare_at_price_max":599999,"compare_at_price_varies":false,"variants":[{"id":47434952180029,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"ARD1028","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"Arduino Leonardo without Headers","public_title":null,"options":["Default Title"],"price":209999,"weight":100,"compare_at_price":599999,"inventory_management":"shopify","barcode":"47434952180029","requires_selling_plan":false,"selling_plan_allocations":[]}],"images":["\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_01.iso.jpg?v=1700968898","\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_00.default.jpg?v=1700968898","\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_04.back.jpg?v=1700968898","\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_03.front.jpg?v=1700968898"],"featured_image":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_01.iso.jpg?v=1700968898","options":["Title"],"media":[{"alt":null,"id":35757300580669,"position":1,"preview_image":{"aspect_ratio":1.333,"height":750,"width":1000,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_01.iso.jpg?v=1700968898"},"aspect_ratio":1.333,"height":750,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_01.iso.jpg?v=1700968898","width":1000},{"alt":null,"id":35757300613437,"position":2,"preview_image":{"aspect_ratio":1.333,"height":750,"width":1000,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_00.default.jpg?v=1700968898"},"aspect_ratio":1.333,"height":750,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_00.default.jpg?v=1700968898","width":1000},{"alt":null,"id":35757300515133,"position":3,"preview_image":{"aspect_ratio":1.333,"height":750,"width":1000,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_04.back.jpg?v=1700968898"},"aspect_ratio":1.333,"height":750,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_04.back.jpg?v=1700968898","width":1000},{"alt":null,"id":35757300547901,"position":4,"preview_image":{"aspect_ratio":1.333,"height":750,"width":1000,"src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_03.front.jpg?v=1700968898"},"aspect_ratio":1.333,"height":750,"media_type":"image","src":"\/\/thinkrobotics.com\/cdn\/shop\/files\/A000052_03.front.jpg?v=1700968898","width":1000}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003cmeta charset=\"UTF-8\"\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel active\" id=\"product-details-information-tab-0\" data-action=\"pushable\" data-id=\"product-details-information-0\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\" itemprop=\"description\"\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-0\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ch1 style=\"text-align: center;\" data-mce-fragment=\"1\"\u003eArduino Leonardo without Headers\u003c\/h1\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Arduino Leonardo is a microcontroller board based on the ATmega32u4 (\u003ca href=\"http:\/\/www.atmel.com\/devices\/atmega32u4.aspx\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/www.atmel.com\/devices\/atmega32u4.aspx\" target=\"_blank\"\u003edatasheet\u003c\/a\u003e). It has 20 digital input\/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial \/ COM port. It also has other implications for the behavior of the board; these are detailed on the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" target=\"_blank\"\u003eGetting started with the Arduino Leonardo.\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eRelated Boards\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eIf you are interested in boards with similar functionality, at Arduino you can find:\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ca data-tabindex-counter=\"1\" data-tabindex-value=\"none\" href=\"https:\/\/store.arduino.cc\/products\/arduino-leonardo-with-headers\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/store.arduino.cc\/products\/arduino-leonardo-with-headers\" target=\"_blank\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eArduino Leonardo with Headers\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003ca data-tabindex-counter=\"1\" data-tabindex-value=\"none\" href=\"https:\/\/store.arduino.cc\/products\/arduino-micro\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/store.arduino.cc\/products\/arduino-micro\" target=\"_blank\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eArduino Micro\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eGetting started\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFind inspiration for your projects with Leonardo board from our tutorial platform \u003ca href=\"https:\/\/create.arduino.cc\/projecthub?by=part\u0026amp;part_id=21297\u0026amp;sort=popular\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/create.arduino.cc\/projecthub?by=part\u0026amp;part_id=21297\u0026amp;sort=popular\" target=\"_blank\"\u003eProject Hub.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe \u003ca href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Guide\/ArduinoLeonardoMicro\" target=\"_blank\"\u003eGetting started with the Arduino Leonardo\u003c\/a\u003epage contains all the information you need to configure your board, use the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\"\u003eArduino Software (IDE)\u003c\/a\u003e, and start tinkering with coding and electronics.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eFrom the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage?from=Main.Tutorials\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage?from=Main.Tutorials\" target=\"_blank\"\u003eTutorials\u003c\/a\u003e section you can find examples from libraries and built-in sketches as well other useful information to expand your knowledge of the Arduino hardware and software.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eNeed Help?\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCheck the Arduino Forum for questions about the \u003ca href=\"https:\/\/forum.arduino.cc\/index.php?board=4.0\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/forum.arduino.cc\/index.php?board=4.0\" target=\"_blank\"\u003eArduino Language\u003c\/a\u003e, or how to make your own \u003ca href=\"https:\/\/forum.arduino.cc\/index.php?board=3.0\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/forum.arduino.cc\/index.php?board=3.0\" target=\"_blank\"\u003eProjects with Arduino\u003c\/a\u003e. Need any help with your board please get in touch with the official Arduino User Support as explained in our \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/ContactUs\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/ContactUs\" target=\"_blank\"\u003eContact Us\u003c\/a\u003e page.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eYou can find \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/warranty\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/warranty\" target=\"_blank\"\u003ehere\u003c\/a\u003e your board warranty information.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel\" id=\"product-details-information-tab-1\" data-action=\"pushable\" data-id=\"product-details-information-1\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\"\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003e \u003c\/h2\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-1\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ctable style=\"width: 70%;\"\u003e\n\u003ctbody data-mce-fragment=\"1\"\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eMicrocontroller\u003c\/td\u003e\n\u003ctd style=\"width: 70%;\"\u003eATmega32u4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eInput Voltage (Recommended)\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e7-12V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eInput Voltage (limits)\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e6-20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eDigital I\/O Pins\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003ePWM Channels\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eAnalog Input Channels\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eDC Current per I\/O Pin\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e40 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eDC Current for 3.3V Pin\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e50 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eFlash Memory\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e32 KB (ATmega32u4) of which 4 KB used by bootloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eSRAM\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e2.5 KB (ATmega32u4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eEEPROM\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e1 KB (ATmega32u4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eClock Speed\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e16 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eLengh\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e68.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eWidth\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e53.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-mce-fragment=\"1\"\u003e\n\u003ctd data-mce-fragment=\"1\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-mce-fragment=\"1\"\u003e20 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel\" id=\"product-details-information-tab-2\" data-action=\"pushable\" data-id=\"product-details-information-2\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\"\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003e \u003c\/h2\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003eDocumentation\u003c\/h2\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-2\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eOSH: Schematics\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Arduino Leonardo is open-source hardware! You can build your own board using the following files:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca class=\"resource eagle\" data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/content.arduino.cc\/assets\/Leonardo-reference.zip\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/content.arduino.cc\/assets\/Leonardo-reference.zip\"\u003eEagle Files\u003c\/a\u003e in .ZIP\u003c\/li\u003e\n\u003cli\u003e\n\u003ca class=\"resource schematics\" data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/content.arduino.cc\/assets\/Leonardo_Rev3d_sch.pdf\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/content.arduino.cc\/assets\/Leonardo_Rev3d_sch.pdf\"\u003eSchematics\u003c\/a\u003e in .PDF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePinout Diagram\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cimg src=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.png\" data-mce-fragment=\"1\" data-mce-src=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.png\"\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDownload the full pinout diagram as PDF \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.pdf\" tabindex=\"-1\" data-mce-fragment=\"1\" target=\"_blank\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/content.arduino.cc\/assets\/Pinout-Leonardo_latest.pdf\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tabpanel\" class=\"product-details-information-tab-content-panel\" id=\"product-details-information-tab-3\" data-action=\"pushable\" data-id=\"product-details-information-3\" data-pusher=\"sc-pushable-xs\" data-mce-fragment=\"1\"\u003e\n\u003ch2 class=\"product-details-information-tab-content-panel-title\" data-mce-fragment=\"1\"\u003eFAQ\u003c\/h2\u003e\n\u003cdiv id=\"product-details-information-tab-content-container-3\" class=\"product-details-information-tab-content-container\" data-type=\"information-content-text\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePower\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. \u003cbr data-mce-fragment=\"1\"\u003eExternal (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. \u003cbr data-mce-fragment=\"1\"\u003eThe power pins are as follows: \u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eVIN. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e5V. The regulated power supply used to power the microcontroller and other components on the board. This can come either from VIN via an on-board regulator, or be supplied by USB or another regulated 5V supply.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eGND. Ground pins.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eIOREF. The voltage at which the i\/o pins of the board are operating (i.e. VCC for the board). This is 5V on the Leonardo.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eMemory\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe ATmega32u4 has 32 KB (with 4 KB used for the bootloader). It also has 2.5 KB of SRAM and 1 KB of EEPROM (which can be read and written with the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"http:\/\/www.arduino.cc\/en\/Reference\/EEPROM\" tabindex=\"-1\" data-mce-fragment=\"1\" target=\"_blank\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/www.arduino.cc\/en\/Reference\/EEPROM\"\u003eEEPROM library\u003c\/a\u003e). \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eInput and Output\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eEach of the 20 digital i\/o pins on the Leonardo can be used as an input or output, using \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/PinMode\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/PinMode\" target=\"_blank\"\u003epinMode()\u003c\/a\u003e, \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalWrite\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalWrite\" target=\"_blank\"\u003edigitalWrite()\u003c\/a\u003e, and \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalRead\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalRead\" target=\"_blank\"\u003edigitalRead()\u003c\/a\u003e functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions:\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSerial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data using theATmega32U4 hardware serial capability. Note that on the Leonardo, the Serial class refers to USB (CDC) communication; for TTL serial on pins 0 and 1, use the Serial1 class.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eTWI: 2 (SDA) and 3 (SCL). Support TWI communication using the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" target=\"_blank\"\u003eWire library\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eExternal Interrupts: 3 (interrupt 0), 2 (interrupt 1), 0 (interrupt 2), 1 (interrupt 3) and 7 (interrupt 4). These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AttachInterrupt\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AttachInterrupt\" target=\"_blank\"\u003eattachInterrupt()\u003c\/a\u003e function for details.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003ePWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output with the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogWrite\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogWrite\" target=\"_blank\"\u003eanalogWrite()\u003c\/a\u003e function.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSPI: on the ICSP header. These pins support SPI communication using the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" target=\"_blank\"\u003eSPI library\u003c\/a\u003e. Note that the SPI pins are not connected to any of the digital I\/O pins as they are on the Uno, They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Leonardo's 6-pin ICSP header, the shield will not work.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eLED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAnalog Inputs: A0-A5, A6 - A11 (on digital pins 4, 6, 8, 9, 10, and 12). The Leonardo has 12 analog inputs, labeled A0 through A11, all of which can also be used as digital i\/o. Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i\/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\"\u003eanalogReference\u003c\/a\u003e() function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThere are a couple of other pins on the board:\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eAREF. Reference voltage for the analog inputs. Used with \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\"\u003eanalogReference\u003c\/a\u003e().\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eReset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSee also the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Hacking\/PinMapping32u4\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Hacking\/PinMapping32u4\" target=\"_blank\"\u003emapping between Arduino pins and ATmega32u4 ports\u003c\/a\u003e. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eCommunication\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega32U4 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). The 32U4 also allows for serial (CDC) communication over USB and appears as a virtual com port to software on the computer. The chip also acts as a full speed USB 2.0 device, using standard USB COM drivers. \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"http:\/\/arduino.cc\/en\/Guide\/Windows#toc4\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/arduino.cc\/en\/Guide\/Windows#toc4\" target=\"_blank\"\u003eOn Windows, a .inf file is required\u003c\/a\u003e. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB connection to the computer (but not for serial communication on pins 0 and 1). A \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"http:\/\/www.arduino.cc\/en\/Reference\/SoftwareSerial\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"http:\/\/www.arduino.cc\/en\/Reference\/SoftwareSerial\" target=\"_blank\"\u003eSoftwareSerial library\u003c\/a\u003e allows for serial communication on any of the Leonardo's digital pins. The ATmega32U4 also supports I2C (TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus; see the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" target=\"_blank\"\u003edocumentation\u003c\/a\u003e for details. For SPI communication, use the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" target=\"_blank\"\u003eSPI library\u003c\/a\u003e. The Leonardo appears as a generic keyboard and mouse, and can be programmed to control these input devices using the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/MouseKeyboard\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/MouseKeyboard\" target=\"_blank\"\u003eKeyboard and Mouse\u003c\/a\u003e classes. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eProgramming\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo can be programmed with the Arduino software (\u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\"\u003edownload\u003c\/a\u003e). Select \"Arduino Leonardo from the Tools \u0026gt; Board menu (according to the microcontroller on your board). For details, see the \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Reference\/HomePage\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Reference\/HomePage\" target=\"_blank\"\u003ereference\u003c\/a\u003e and \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage\" target=\"_blank\"\u003etutorials\u003c\/a\u003e. The ATmega32U4 on the Arduino Leonardo comes preburned with a \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/Bootloader\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/Bootloader\" target=\"_blank\"\u003ebootloader\u003c\/a\u003e that allows you to upload new code to it without the use of an external hardware programmer. It communicates using the AVR109 protocol. You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Main\/ArduinoISP\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Main\/ArduinoISP\" target=\"_blank\"\u003eArduino ISP\u003c\/a\u003e or similar; see \u003ca data-tabindex-counter=\"7\" data-tabindex-value=\"none\" href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Programmer\" tabindex=\"-1\" data-mce-fragment=\"1\" data-mce-tabindex=\"-1\" data-mce-href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Programmer\" target=\"_blank\"\u003ethese instructions\u003c\/a\u003e for details. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eAutomatic (Software) Reset and Bootloader Initiation\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eRather than requiring a physical press of the reset button before an upload, the Leonardo is designed in a way that allows it to be reset by software running on a connected computer. The reset is triggered when the Leonardo's virtual (CDC) serial \/ COM port is opened at 1200 baud and then closed. When this happens, the processor will reset, breaking the USB connection to the computer (meaning that the virtual serial \/ COM port will disappear). After the processor resets, the bootloader starts, remaining active for about 8 seconds. The bootloader can also be initiated by pressing the reset button on the Leonardo. Note that when the board first powers up, it will jump straight to the user sketch, if present, rather than initiating the bootloader. \u003cbr data-mce-fragment=\"1\"\u003eBecause of the way the Leonardo handles reset it's best to let the Arduino software try to initiate the reset before uploading, especially if you are in the habit of pressing the reset button before uploading on other boards. If the software can't reset the board you can always start the bootloader by pressing the reset button on the board. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eUSB Overcurrent Protection\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe Leonardo has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed. \u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003e \u003c\/h3\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003ePhysical Characteristics\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe maximum length and width of the Leonardo PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16\"), not an even multiple of the 100 mil spacing of the other pins.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e"}