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Re: Photoeye's not working-Difference between RoboRIO and Digital Side Card?
The VRM is not isolated. If you measure the voltage difference between the VRM ground and the Rio ground you should find it to be very close to zero .
Measure the light sensors input voltage to confirm its powered properly. Then measure the signal voltage to see why the readings from the Rio don't match your expectations. That might reveal what's going on.
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