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FlyingLotus1983
I've created a custom motion controller for my new RepRap based [...]
What's the point of reinventing the wheel?
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FlyingLotus1983
I'm finally getting it running, and it seems like when the motors are enabled, I'm hearing this weird repeating pattern of pwm noises. I'm watching the stepper signals on a scope, they'll do the PWM and then just go to the +12V rail for a sec and then back to PWMing. Here's a cellphone video that demonstrates the problem:
[www.youtube.com]
Sounds much like stepper driver chips overheating. As you probably know, their load is highest with the stepper not turning. Reducing motor current on the trimpot should help.