Re: stepper motor making weird noises...

"Going in random direction" Sound familiar. When I built my first step motor
driver it worked great with some motors but not others. If you're not
already, try both diodes reversed biased across the coils to eliminate the
back EMF and diodes in line with the phase wires forward biased to protect
the driver. I had similar problems and after adding the diodes it worked
great with all step motors I tried after that. I was using a pic16f877 to
control the step motors and interface to a computer through an RS232 port.
Commands where sent to the controller using hyper terminal.



Hope this helps,

Dennis