Thanks for all your help. Based on your answers I added a try & catch on the AnalogRead and that traps the error and keeps the code running so I can retry the read. I am a C (with some C++) programmer so if I was doing this in C I would find the A/D busy flag in a register somewhere and only read when not busy. But I am trying to learn something new so I am learning BoneScript - for better or worse. Pretty sure I will be programming in C soon!
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