SDA SCL I2C TWI Pins on the Arduino

This post details where the SDA SCL pins used for I2C/TWI are available on Arduino’s.

I2C TWI pins on the Arduino

The SDA and SCL pins are the used for communication using the I2C/TWI protocols. These allow multiple devices to communicate the Arduino on a standard interface.

Most Arduino’s only have one set of these pins however the Due has two.

Board I2C / TWI pins
Uno, Ethernet A4 (SDA), A5 (SCL)
Mega2560 20 (SDA), 21 (SCL)
Leonardo 2 (SDA), 3 (SCL)
Due 20 (SDA), 21 (SCL), SDA1SCL1

For more information, you can read the Arduino page on the Wire library.

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