Robo-Tank 3rd Generation Hardware

[Rob F]

Glad to hear you solved the uploading, and I'm not sure what to think about the boards not communicating. A few months ago I changed the circuit and haven't had an issue and now the way it's setup is there are 3 communication lines between display and controller, when the controller turns on it checks each line and uses the first one that works. This means it's scanning all 3 lines and each are down which is a surprise because each line has independent components so if one goes down they all can't. That's why I'm think it's the cable but I'm guessing you tried a few types? Can you check the voltage on the Tx1/Rx1, Tx2/Rx2, and Tx3/Rx3 pins on the top of the controller board, they're all marked so you should see them.

Also I attached a couple sketches to load on display and controller which tests everything, press the "run test" on the display a few times to see what you get.