Arduino Uno vs Mega

What are differences between Arduino Uno and Mega from application point of view? Is Arduino Uno code can run on Arduino Mega?



In detail:


  • SPI interface: SPI pins (MOSI, MISO, SCK, SS) are different between Arduino Uno and Mega. Howerver, SPI code of Uno can run on Mega without modification if SPI device connect to Arduino Mega via ICSP header. For example, Ethernet Shield code that works on Uno will work on Mega.
  • I2C interface:
    • If you connect I2C device to pin A4 and A5 of Uno, you need to change the wiring when you switch to Arduino Mega
    • If you connect I2C device to pin 18 and 19 of Uno, you do not need to do any modification (pin 18 (SDA) and 19 (SCL) on UNO have the same position with pin 20 (SDA) and 21(SCL) on Mega)

This anwser does not go in depth the differences between Uno and Mega. It is unnecessary from application point of view.

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