Recommended · for beginners
Arduino Tutorial #10: Arduino to Arduino I2C
Why people recommend it
Offered as a tutorial on linking two Arduinos as master and slave, though viewers question the way it shares power between the boards.
Watch for: Check the power wiring before copying it
In their words
I saw this youtube video which very briefly mentions doing this by make the connections:
xeuari on arduino.stackexchange.com, Feb 2016. CC BY-SA.
