@Maximilian-Gerhardt Hi Maximillian, There is an issue with the Python code that causes reads to not return correct results (http://community.onion.io/topic/2347/issues-with-controleverything-ad7999/6). ControlEverything recommended to try the C code. I'll give your fix'ed up code a try tonight! Tx Bas

I put the whole code in a loop to let it run continuously. With nothing connected, the most common result I get is 16. Don't understand what the divide by 16 (2 bytes?) does. But big coincidence that is my most common reading? If I put 2x 1.5V cell on, the reading only goes up to 33 or so Bas