Compared to Arduino Mega, we shrunk the volume of Arduino Mega by at least 30 and made it 100 compatible with Seeed. It features ATmega2560 processor which brings a large number of I/O pins, as much as 70 digital I/O, 16 analog inputs, 14 PWM, and 4 hardware serial ports. Seeeduino Mega is a powerful micro-controller derived from Arduino Mega.
The Arduino Mega 2560 has 15 pins which can be used for PWM output. For details, see the reference and tutorials.Arduino PWM introduction. PINOUT DIAGRAMThe Mega 2560 board can be programmed with the Arduino Software (IDE).
Arduino Mega Pinout Pwm Mac OS X And Linux
You can then use Atmel’s FLIP software (Windows) or the DFU programmer (Mac OS X and Linux) to load a new firmware. 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. On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2. The ATmega16U2/8U2 is loaded with a DFU bootloader, which can be activated by: Normally you do this with the analogWrite() command, however, you can access the Atmel.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.The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available in the Arduino repository. It communicates using the original STK500 protocol ( reference, C header files).The Arduino Mega 2560 has 15 pins which can be used for PWM output.
The adapter can be connected by plugging a 2.1mm center-positive plug into the board’s power jack. The power source is selected automatically.External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. PowerThe Mega 2560 can be powered via the USB connection or with an external power supply. 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. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. See this user-contributed tutorial for more information.The Mega 2560 has a resettable polyfuse that protects your computer’s USB ports from shorts and overcurrent.
This pin outputs a regulated 5V from the regulator on the board. You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. 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). The recommended range is 7 to 12 volts. If using more than 12V, the voltage regulator may overheat and damage the board. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may become unstable.
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.The 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 EEPROM library).See the mapping between Arduino pins and Atmega2560 ports:Each of the 54 digital pins on the Mega can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. This pin on the board provides the voltage reference with which the microcontroller operates. Maximum current draw is 50 mA. A 3.3 volt supply generated by the on-board regulator. Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board.
External Interrupts: 2 (interrupt 0), 3 (interrupt 1), 18 (interrupt 5), 19 (interrupt 4), 20 (interrupt 3), and 21 (interrupt 2). Pins 0 and 1 are also connected to the corresponding pins of the ATmega16U2 USB-to-TTL Serial chip. Used to receive (RX) and transmit (TX) TTL serial data. 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). A maximum of 40mA is the value that must not be exceeded to avoid permanent damage to the microcontroller.In addition, some pins have specialized functions:
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. Support TWI communication using the Wire library. TWI: 20 (SDA) and 21 (SCL). When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off. There is a built-in LED connected to digital pin 13. 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.
The ATmega2560 provides four hardware UARTs for TTL (5V) serial communication. Typically used to add a reset button to shields which block the one on the board.The Mega 2560 board has a number of facilities for communicating with a computer, another board, or other microcontrollers. Bring this line LOW to reset the microcontroller. Used with analogReference(). Reference voltage for the analog inputs.
For SPI communication, use the SPI library. The Arduino Software (IDE) includes a Wire library to simplify use of the TWI bus see the documentation for details. 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).A SoftwareSerial library allows for serial communication on any of the Mega 2560’s digital pins.The Mega 2560 also supports TWI and SPI communication. The Arduino Software (IDE) includes a serial monitor which allows simple textual data to be sent to and from the board. Inf file, but OSX and Linux machines will recognize the board as a COM port automatically.
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. 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.The Mega 2560 is designed to be compatible with most shields designed for the Uno and the older Diecimila or Duemilanove Arduino boards. Three screw holes allow the board to be attached to a surface or case.
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. Automatic (Software) ResetRather 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. 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). SPI is available through the ICSP header on both the Mega 2560 and Duemilanove / Diecimila boards.
While it is programmed to ignore malformed data (i.e. For the following half-second or so, the bootloader is running on the ATMega2560. 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). 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.This setup has other implications. The Arduino Software (IDE) uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment.
The pads on either side of the trace can be soldered together to re-enable it. 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.The Mega 2560 board contains a trace that can be cut to disable the auto-reset.
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