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After further tests and searching on this forum, I believe I've got a fix in adding a pinMode(A14, INPUT) line in the setup code.

Not sure why this would fix the problem, but it appears to work.

Hello,

I appear to be having a problem with analogueRead using T4.1

I have a simple setup, a potentiometer wired to 3.3v and Gnd, with the sweeper pin connected to A14.
I am reading the analog...

Thanks for the response. I did not think about using an opto isolator. At least this will ensure there is no interaction when the power is off.

I've not used one before, off to google to learn...

Hello all,

This is my first post on this forum and my first time using a Teensy. I have been using Arduino Micro and Mega for a while now.

I am working on a hobby project which requires a...