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Re: E4P encoder
Check the encoder A and B wires with a digital multimeter. You should see them transition between 0V and 5V as you touch the encoder. It doesn't take much to get the voltage to change, since there are 360 pulses per revolution.
If you don't get any changes on either the A or B, double check that you are getting a bright red light in the encoder. Check the spacing between the disc and the red light, it can't be too close or too far. Then check if you haven't accidentally ripped the connector traces our of the encoder. The white plastic connector on the encoder PCB is fragile, and can only take so many connects and disconnects... if not done very carefully.
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