I made a PCB. I have 12 V supplied to VMOT. A1 and B1 are both 12V. It's wired like the diagram.
Fault pin is 4 V which is odd. 5 V is supplied to the Arduino. The 5 V output is about 4 V which is odd.
The program runs perfectly fine on a previous version of the PCB. I adjust the potentiometer, and the noise persists. Any suggestions?
I also ran it at 24 V (VMOT). I've had the PCB double checked by someone else, and we both tested voltages. Everything looks good except for the fault pin.