![]() Find great deals on eBay for Arduino Mega 2560 R3 in Miscellaneous Gadgets. No drivers needed for Linux or Mac (inf file for Windows is needed. Arduino Compatible Mega 2560 Atmega2560 Mega2560 R3 Board + USB Cable. The board i got in the mail shipped from Shenzen, China and is labeled 'designed in italy'. (in short it doesn't even work WITH ARDUINO SOFTWARE). The Mega 2560 is a microcontroller board based on the. 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. The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available in the. The ATmega16U2/8U2 is loaded with a DFU bootloader, which can be activated by: • On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2. • On 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 (Windows) or the (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 for more information. The power pins are as follows: • Vin. 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. 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. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA. 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. In addition, some pins have specialized functions: • Serial: 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. • External 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 function for details. • PWM: 2 to 13 and 44 to 46. Provide 8-bit PWM output with the function. • SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS). These pins support SPI communication using the. 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. 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. • TWI: 20 (SDA) and 21 (SCL). Support TWI communication using the. Note that these pins are not in the same location as the TWI pins on the old Duemilanove or Diecimila Arduino boards. See also the mapping Arduino Mega 2560 PIN diagram. The 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 function. There are a couple of other pins on the board: • AREF. Reference voltage for the analog inputs. Used with analogReference(). Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board. Communication The 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.
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