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i2c communication between an Arduino Uno and an Arduino Mega 2560 - 10/18/2012
I've never worked with i2c before, except to connect an i2c LCD.  In this video, I get an Arduino Mega 2560 and an Arduino Uno to talk to eachother over an i2c bus. The Arduino Mega 2560 is set up as the master device.  I connect pin 20 (SDA) to a negative power rail on the breadboard, and pin 21 (SCL) to a positive rail.  On the Arduino Uno, I have A4(SDA) connected to the negative power

i2c communication between an Arduino Uno and an Arduino Mega 2560



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