I have 3x Rainbowduinos V2 and 3x Rainbowduinos V3
I have a project where I want three of the Rainbowduinos to work together as a simple 8x24 RGB matrix.
On the wiki pages for both V2 & V3, it says “can be easily cascaded to use i2c”.
My question is how to use 2-3 boards with i2c? Physically is easy - just chain them together.
Is there any example working code (an arduino sketch) anywhere in the world for this?
All I see so far is rumors about i2c being hard because you don’t have interrupts available - that doesn’t sound like easy.