Intermittent digital signal when PWMs are used

[EricVanWyk]

Originally Posted by Alan Anderson

That wouldn't explain why disconnecting the PWM outputs makes it better, would it? The missing BAT light in particular hints strongly at a faulty "upstream" power connection.

Hmm... Good point. I think I misread something, and I think I agree with you.

The PWM power is powered by the 6V rail, which is independent of the 5V rail. However, the PWM signal is powered by the 5V rail... but there is enough output impedance so that hard shorting every single PWM signal to ground wouldn't be enough to short the 5V rail. I had forgotten about those resistors!


EDIT: Scratch that last theory.

This sounds like you are fantom powering the DSC from the cRIO. I (now) strongly agree with Alan that your connection to the battery is bad.