{"product_id":"arduino-leonardo-1","title":"Arduino Leonardo","description":"\u003cp\u003eThe \u003cstrong\u003eArduino Leonardo\u003c\/strong\u003e is a microcontroller board based on the \u003ca href=\"http:\/\/www.atmel.com\/devices\/atmega32u4.aspx\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eATmega32u4\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eIt 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\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\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e getting started page\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eGetting Started\u003c\/h2\u003e\n\u003cp\u003eYou can find in the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Guide\/HomePage\" target=\"_blank\" rel=\"noopener noreferrer\"\u003e Getting Started section\u003c\/a\u003e all the information you need to configure your board, use the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eArduino Software (IDE)\u003c\/a\u003e, and start tinker with coding and electronics. \u003c\/p\u003e\n\u003ch2\u003eNeed Help?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOn the Software \u003ca href=\"https:\/\/forum.arduino.cc\/index.php?board=63.0\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eon the Arduino Forum\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eOn Projects \u003ca href=\"https:\/\/forum.arduino.cc\/index.php?board=3.0\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eon the Arduino Forum\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eOn the Product itself through \u003ca href=\"https:\/\/store.arduino.cc\/index.php?main_page=contact_us\u0026amp;language=en\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eArduino Customer Support\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTech Specs\u003c\/h2\u003e\n\u003ctable class=\"table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMicrocontroller\u003c\/td\u003e\n\u003ctd\u003eATmega32u4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage (Recommended)\u003c\/td\u003e\n\u003ctd\u003e7-12V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage (limits)\u003c\/td\u003e\n\u003ctd\u003e6-20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital I\/O Pins\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePWM Channels\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Input Channels\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Current per I\/O Pin\u003c\/td\u003e\n\u003ctd\u003e40 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Current for 3.3V Pin\u003c\/td\u003e\n\u003ctd\u003e50 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlash Memory\u003c\/td\u003e\n\u003ctd\u003e32 KB (ATmega32u4) of which 4 KB used by bootloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSRAM\u003c\/td\u003e\n\u003ctd\u003e2.5 KB (ATmega32u4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM\u003c\/td\u003e\n\u003ctd\u003e1 KB (ATmega32u4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClock Speed\u003c\/td\u003e\n\u003ctd\u003e16 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLenght\u003c\/td\u003e\n\u003ctd\u003e68.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e53.3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e20 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOSH: Schematics\u003c\/h2\u003e\n\u003cp\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\u003ca href=\"https:\/\/www.arduino.cc\/en\/uploads\/Main\/arduino-leonardo-reference-design_3b.zip\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eEagle files\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/arduino-leonardo-schematic_3b.pdf?17899648973434998095\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSchematics\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePower\u003c\/h2\u003e\n\u003cp\u003eThe Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. \u003cbr\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\u003eThe power pins are as follows: \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVIN\u003c\/strong\u003e. 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\u003e\n\u003cstrong\u003e5V\u003c\/strong\u003e. 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\u003e\n\u003cstrong\u003e3V3\u003c\/strong\u003e. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGND\u003c\/strong\u003e. Ground pins.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIOREF\u003c\/strong\u003e. 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\u003ch2\u003eMemory\u003c\/h2\u003e\n\u003cp\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 href=\"http:\/\/www.arduino.cc\/en\/Reference\/EEPROM\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eEEPROM library\u003c\/a\u003e). \u003c\/p\u003e\n\u003ch2\u003eInput and Output\u003c\/h2\u003e\n\u003cp\u003eEach of the 20 digital i\/o pins on the Leonardo can be used as an input or output, using \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/PinMode\" target=\"_blank\" rel=\"noopener noreferrer\"\u003epinMode()\u003c\/a\u003e, \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalWrite\" target=\"_blank\" rel=\"noopener noreferrer\"\u003edigitalWrite()\u003c\/a\u003e, and \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/DigitalRead\" target=\"_blank\" rel=\"noopener noreferrer\"\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\u003e\n\u003cli\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\u003eTWI: 2 (SDA) and 3 (SCL). Support TWI communication using the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eWire library\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\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 href=\"https:\/\/www.arduino.cc\/en\/Reference\/AttachInterrupt\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eattachInterrupt()\u003c\/a\u003e function for details.\u003c\/li\u003e\n\u003cli\u003ePWM: 3, 5, 6, 9, 10, 11, and 13. Provide 8-bit PWM output with the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogWrite\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eanalogWrite()\u003c\/a\u003e function.\u003c\/li\u003e\n\u003cli\u003eSPI: on the ICSP header. These pins support SPI communication using the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" target=\"_blank\" rel=\"noopener noreferrer\"\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\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\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 href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eanalogReference\u003c\/a\u003e() function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThere are a couple of other pins on the board:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAREF. Reference voltage for the analog inputs. Used with \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eanalogReference\u003c\/a\u003e().\u003c\/li\u003e\n\u003cli\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\u003eSee also the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Hacking\/PinMapping32u4\" target=\"_blank\" rel=\"noopener noreferrer\"\u003emapping between Arduino pins and ATmega32u4 ports\u003c\/a\u003e. \u003c\/p\u003e\n\u003ch2\u003eCommunication\u003c\/h2\u003e\n\u003cp\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 href=\"http:\/\/arduino.cc\/en\/Guide\/Windows#toc4\" target=\"_blank\" rel=\"noopener noreferrer\"\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 href=\"http:\/\/www.arduino.cc\/en\/Reference\/SoftwareSerial\" target=\"_blank\" rel=\"noopener noreferrer\"\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 href=\"https:\/\/www.arduino.cc\/en\/Reference\/Wire\" target=\"_blank\" rel=\"noopener noreferrer\"\u003edocumentation\u003c\/a\u003e for details. For SPI communication, use the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/SPI\" target=\"_blank\" rel=\"noopener noreferrer\"\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 href=\"https:\/\/www.arduino.cc\/en\/Reference\/MouseKeyboard\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eKeyboard and Mouse\u003c\/a\u003e classes. \u003c\/p\u003e\n\u003ch2\u003eProgramming\u003c\/h2\u003e\n\u003cp\u003eThe Leonardo can be programmed with the Arduino software (\u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\" rel=\"noopener noreferrer\"\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 href=\"https:\/\/www.arduino.cc\/en\/Reference\/HomePage\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ereference\u003c\/a\u003e and \u003ca href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/HomePage\" target=\"_blank\" rel=\"noopener noreferrer\"\u003etutorials\u003c\/a\u003e. The ATmega32U4 on the Arduino Leonardo comes preburned with a \u003ca href=\"https:\/\/www.arduino.cc\/en\/Tutorial\/Bootloader\" target=\"_blank\" rel=\"noopener noreferrer\"\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 href=\"https:\/\/www.arduino.cc\/en\/Main\/ArduinoISP\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eArduino ISP\u003c\/a\u003e or similar; see \u003ca href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Programmer\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ethese instructions\u003c\/a\u003e for details. \u003c\/p\u003e\n\u003ch2\u003eAutomatic (Software) Reset and Bootloader Initiation\u003c\/h2\u003e\n\u003cp\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\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\u003ch2\u003eUSB Overcurrent Protection\u003c\/h2\u003e\n\u003cp\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\u003ch2\u003ePhysical Characteristics\u003c\/h2\u003e\n\u003cp\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","brand":"Arduino","offers":[{"title":"Default Title","offer_id":3092625686538,"sku":"A000057","price":21.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/a000057_front_1_aaad4c8f-2c78-4e26-bb41-779809551760.jpg?v=1530371787","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/arduino-leonardo-1","provider":"Pimoroni Ltd","version":"1.0","type":"link"}