That means that if you install MegaCore via Boards Manager, or have an old manually installed version, you will only be able to use the extra pins with Tools > Pinout > AVR pinout selected (and note that pinout has different pin mapping than what is marked on the Mega's silkscreen. By using this board, the Arduino mega projected can be designed. DS3231 Module has higher precision than DS1370. UART/Serial: UART is a communication method that uses two wires and transmits bytes of data. It is much slower than SPI, but uses only two pins. To get date and time, we needs to use a Real-Time Clock (RTC) module such as DS3231, DS1370. I2C: This protocol is also for connecting to external items. However, they can not provide the date and time (seconds, minutes, hours, day, date, month, and year). All analog pins of this board can be used as digital I/O pins. Arduino itself has some time-related functions such as millis(), micros(). Arduino Comparison Chart: Boards & Modules. This applies to Arduino Uno and Arduino MEGA 2560 boards. As a result, it is possible to directly drive or switch a buzzer that draws up to 30mA. In fact it is possible to draw more than 20mA from a pin. Arduino give the maximum current draw of a digital output pin as 20mA. These pins can be classified into different categories like digital pins, analog pins, power pins, and communication pins. Here you will find all of the technical documentation and support files for the Arduino Mega 2560 Revision 3. Arduino Uno and MEGA 2560 Pin Current Limits. Every pin of this board comes by a particular function which is allied with it. The Arduino Mega pin diagram consists of a grid of pins, each labeled with a unique number and a corresponding function. There are pin mappings to Atmega8 and Atmega 168/328 as well. Yes, you could modify the variant file, but this work has already been done for us by MCUdude in their excellent MegaCore, so it's much better to not duplicate work that is already I should have mentioned that, although the work has been done to support all pins of the ATmega2560 in both the pinout options for the ATmega2560, this work for the "Arduino MEGA pinout" was done after the time of the last MegaCore release. The pin configuration of this Arduino mega 2560 board is shown below. Below is the pin mapping for the Atmega2560. If you want to use extra pins, you can rewrite the Arduino header file, add the extra pins to be used in the Arduino header file, and ensure that they do not conflict with the original used pins. Green have the same function and position as the Arduino UNO R3. The compiler in this case is avr-gcc, though each hardware package can use its own compiler tool. As per diagra of Arduino Mega 2560 Reference Design diagram: INT0 : Digital Pin-21 INT1 : Pin-22 INT2 : Pin-23 Inspired by Nicks UNO pinout I did a similar one for the Arduino Mega2560 R3. The default compiler* (that is, the Arduino IDE)
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