Robin2:
An Arduino Mega2560 - look up the Arduino product page.That wasn't really why I pressed Reply, however ...
It must be blindingly obvious to all that you don't need three Arduinos to add two numbers. So it would probably be useful if you explain what your project is really about.
...R
ahahah yes I would not need three Arduino, one would be probably enough.
BUT, since it is an art project/experiment, I need three physical hardwares interconnected.
A and B would interact between them only through C.
A C B (just to visualize)