{"product_id":"arduino-mega-2560-rev3","title":"Arduino Mega 2560 Rev3","description":"\u003cp\u003eThe MEGA 2560 is designed for more complex projects. With 54 digital I\/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eArduino Mega 2560\u003c\/strong\u003e is a microcontroller board based on the \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/Atmel-2549-8-bit-AVR-Microcontroller-ATmega640-1280-1281-2560-2561_datasheet.pdf?15530428479858378689\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eATmega2560\u003c\/a\u003e. It has 54 digital input\/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a 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 Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila.\u003c\/p\u003e\n\u003cp\u003eThe Mega 2560 is an update to the Arduino Mega, which it replaces.\u003c\/p\u003e\n\u003cp\u003eYou can find your board warranty information \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/warranty\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ehere\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\"\u003eGetting Started section\u003c\/a\u003e all the information you need to configure your board, use the Arduino Software (IDE), 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\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/Atmel-2549-8-bit-AVR-Microcontroller-ATmega640-1280-1281-2560-2561_datasheet.pdf?15530428479858378689\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eATmega2560\u003c\/a\u003e\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 (limit)\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\u003e54 (of which 15 provide PWM output)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Input Pins\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Current per I\/O Pin\u003c\/td\u003e\n\u003ctd\u003e20 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\u003e256 KB of which 8 KB used by bootloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSRAM\u003c\/td\u003e\n\u003ctd\u003e8 KB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEEPROM\u003c\/td\u003e\n\u003ctd\u003e4 KB\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\u003eLED_BUILTIN\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e101.52 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\u003e37 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\u003eArduino Mega 2560 is open-source hardware! You can build your own board using the follwing files:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.arduino.cc\/en\/uploads\/Main\/arduino-mega2560_R3-ref-design.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-mega2560_R3-sch.pdf?3431021438501163751\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSchematics\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/dimensioniMega.dxf?2235728668963052798\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eBoard Size\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProgramming\u003c\/h2\u003e\n\u003cp\u003eThe Mega 2560 board can be programmed with the \u003ca href=\"https:\/\/www.arduino.cc\/en\/Main\/Software\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eArduino Software (IDE)\u003c\/a\u003e. 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.\u003c\/p\u003e\n\u003cp\u003eThe ATmega2560 on the Mega 2560 comes preprogrammed with a \u003ca href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Bootloader?from=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 original STK500 protocol (\u003ca href=\"http:\/\/www.atmel.com\/Images\/doc2525.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ereference\u003c\/a\u003e, \u003ca href=\"http:\/\/www.atmel.com\/dyn\/resources\/prod_documents\/avr061.zip\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eC header files\u003c\/a\u003e).\u003c\/p\u003e\n\u003cp\u003eYou 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 these \u003ca href=\"https:\/\/www.arduino.cc\/en\/Hacking\/Programmer\" target=\"_blank\" rel=\"noopener noreferrer\"\u003einstructions for details\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eThe ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available in the \u003ca href=\"https:\/\/github.com\/arduino\/Arduino\/tree\/master\/hardware\/arduino\/avr\/firmwares\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eArduino repository\u003c\/a\u003e. The ATmega16U2\/8U2 is loaded with a DFU bootloader, which can be activated by:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOn Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2.\u003c\/li\u003e\n\u003cli\u003eOn Rev2 or later boards: there is a resistor that pulling the 8U2\/16U2 HWB line to ground, making it easier to put into DFU mode. You can then use \u003ca href=\"http:\/\/www.atmel.com\/dyn\/products\/tools_card.asp?tool_id=3886\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eAtmel's FLIP software\u003c\/a\u003e (Windows) or the \u003ca href=\"http:\/\/dfu-programmer.sourceforge.net\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDFU programmer\u003c\/a\u003e (Mac OS X and Linux) to load a new firmware. Or you can use the ISP header with an external programmer (overwriting the DFU bootloader). See \u003ca href=\"http:\/\/www.arduino.cc\/cgi-bin\/yabb2\/YaBB.pl?num=1285962838\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ethis user-contributed tutorial\u003c\/a\u003e for more information.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWarnings\u003c\/h2\u003e\n\u003cp\u003eThe Mega 2560 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\u003ePower\u003c\/h2\u003e\n\u003cp\u003eThe Mega 2560 can be powered via the USB connection or with an external power supply. The power source is selected automatically.\u003c\/p\u003e\n\u003cp\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.\u003c\/p\u003e\n\u003cp\u003eThe board can operate on an external supply of 6 to 20 volts. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.\u003c\/p\u003e\n\u003cp\u003eThe power pins are as follows:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVin. The input voltage to the 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\u003e5V. This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.\u003c\/li\u003e\n\u003cli\u003e3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.\u003c\/li\u003e\n\u003cli\u003eGND. Ground pins.\u003c\/li\u003e\n\u003cli\u003eIOREF. This pin on the board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMemory\u003c\/h2\u003e\n\u003cp\u003eThe ATmega2560 has 256 KB of flash memory for storing code (of which 8 KB is used for the bootloader), 8 KB of SRAM and 4 KB of EEPROM (which can be read and written with the \u003ca href=\"https:\/\/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\u003eSee the mapping between Arduino pins and Atmega2560 ports \u003ca href=\"https:\/\/www.arduino.cc\/en\/Hacking\/PinMapping2560\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ehere\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eEach of the 54 digital pins on the Mega 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 20 mA as recommended operating condition and has an internal pull-up resistor (disconnected by default) of 20-50 k ohm. A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller.\u003c\/p\u003e\n\u003cp\u003eIn addition, some pins have specialized functions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSerial: 0 (RX) and 1 (TX); Serial 1: 19 (RX) and 18 (TX); Serial 2: 17 (RX) and 16 (TX); Serial 3: 15 (RX) and 14 (TX). Used to receive (RX) and transmit (TX) TTL serial data. Pins 0 and 1 are also connected to the corresponding pins of the ATmega16U2 USB-to-TTL Serial chip.\u003c\/li\u003e\n\u003cli\u003eExternal Interrupts: 2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2). These pins can be configured to trigger an interrupt on a low level, a rising or falling edge, or a change in level. 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: 2 to 13 and 44 to 46. 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: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS). 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. The SPI pins are also broken out on the ICSP header, which is physically compatible with the Arduino \/Genuino Uno and the old Duemilanove and Diecimila Arduino boards.\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\u003eTWI: 20 (SDA) and 21 (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. Note that these pins are not in the same location as the TWI pins on the old Duemilanove or Diecimila Arduino boards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSee also the mapping Arduino Mega 2560 PIN diagram.\u003c\/p\u003e\n\u003cp\u003eThe Mega 2560 has 16 analog inputs, each of which provide 10 bits of resolution (i.e. 1024 different values). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/AnalogReference\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eanalogReference()\u003c\/a\u003e function.\u003cbr\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 analogReference().\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\u003ch2\u003eCommunication\u003c\/h2\u003e\n\u003cp\u003eThe Mega 2560 board has a number of facilities for communicating with a computer, another board, or other microcontrollers. The ATmega2560 provides four hardware UARTs for TTL (5V) serial communication. An ATmega16U2 (ATmega 8U2 on the revision 1 and revision 2 boards) on the board channels one of these over USB and provides a virtual com port to software on the computer (Windows machines will need a .inf file, but OSX and Linux machines will recognize the board as a COM port automatically. The Arduino Software (IDE) includes a serial monitor which allows simple textual data to be sent to and from the board. The RX and TX LEDs on the board will flash when data is being transmitted via the ATmega8U2\/ATmega16U2 chip and USB connection to the computer (but not for serial communication on pins 0 and 1).\u003c\/p\u003e\n\u003cp\u003eA \u003ca href=\"https:\/\/www.arduino.cc\/en\/Reference\/SoftwareSerial\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eSoftwareSerial library\u003c\/a\u003e allows for serial communication on any of the Mega 2560's digital pins.\u003c\/p\u003e\n\u003cp\u003eThe Mega 2560 also supports TWI and SPI communication. The Arduino Software (IDE) includes a Wire library to simplify use of the TWI 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.\u003c\/p\u003e\n\u003ch2\u003ePhysical Characteristics and Shield Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe maximum length and width of the Mega 2560 PCB are 4 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. Three 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\u003cp\u003eThe Mega 2560 is designed to be compatible with most shields designed for the Uno and the older Diecimila or Duemilanove Arduino boards. Digital pins 0 to 13 (and the adjacent AREF and GND pins), analog inputs 0 to 5, the power header, and ICSP header are all in equivalent locations. Furthermore, the main UART (serial port) is located on the same pins (0 and 1), as are external interrupts 0 and 1 (pins 2 and 3 respectively). SPI is available through the ICSP header on both the Mega 2560 and Duemilanove \/ Diecimila boards. Please note that I2C is not located on the same pins on the Mega 2560 board (20 and 21) as the Duemilanove \/ Diecimila boards (analog inputs 4 and 5).\u003c\/p\u003e\n\u003ch2\u003eAutomatic (Software) Reset\u003c\/h2\u003e\n\u003cp\u003eRather then requiring a physical press of the reset button before an upload, the Mega 2560 is designed in a way that allows it to be reset by software running on a connected computer. One of the hardware flow control lines (DTR) of the ATmega8U2 is connected to the reset line of the ATmega2560 via a 100 nanofarad capacitor. When this line is asserted (taken low), the reset line drops long enough to reset the chip. The Arduino Software (IDE) uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment. This means that the bootloader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload.\u003c\/p\u003e\n\u003cp\u003eThis setup has other implications. When the Mega 2560 board is connected to either a computer running Mac OS X or Linux, it resets each time a connection is made to it from software (via USB). For the following half-second or so, the bootloader is running on the ATMega2560. While it is programmed to ignore malformed data (i.e. anything besides an upload of new code), it will intercept the first few bytes of data sent to the board after a connection is opened. If a sketch running on the board receives one-time configuration or other data when it first starts, make sure that the software with which it communicates waits a second after opening the connection and before sending this data.\u003c\/p\u003e\n\u003cp\u003eThe Mega 2560 board contains a trace that can be cut to disable the auto-reset. The pads on either side of the trace can be soldered together to re-enable it. It's labeled \"RESET-EN\". You may also be able to disable the auto-reset by connecting a 110 ohm resistor from 5V to the reset line; see \u003ca href=\"http:\/\/www.arduino.cc\/cgi-bin\/yabb2\/YaBB.pl?num=1213719666\/all\" target=\"_blank\" rel=\"noopener noreferrer\"\u003ethis forum thread\u003c\/a\u003e for details.\u003c\/p\u003e\n\u003ch2\u003eRevisions\u003c\/h2\u003e\n\u003cp\u003eThe Mega 2560 does not use the FTDI USB-to-serial driver chip used in past designs. Instead, it features the ATmega16U2 (ATmega8U2 in the revision 1 and revision 2 Arduino boards) programmed as a USB-to-serial converter.\u003cbr\u003eRevision 2 of the Mega 2560 board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into \u003ca href=\"https:\/\/www.arduino.cc\/en\/Hacking\/DFUProgramming8U2\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDFU mode.\u003c\/a\u003e\u003cbr\u003eRevision 3 of the Arduino board and the current Genuino Mega 2560 have the following improved features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1.0 pinout: SDA and SCL pins - near to the AREF pin - and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the board that uses ATSAM3X8E, that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.\u003c\/li\u003e\n\u003cli\u003eStronger RESET circuit.\u003c\/li\u003e\n\u003cli\u003eAtmega 16U2 replace the 8U2.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Arduino","offers":[{"title":"Default Title","offer_id":3092530462730,"sku":"A000067","price":42.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/a000067_iso_9644e4ad-94dd-427e-9848-0349cb72353d.jpg?v=1530360987","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/arduino-mega-2560-rev3","provider":"Pimoroni Ltd","version":"1.0","type":"link"}