Microstepping a stepper motor with the SLA7062

Stepper motors can be made to rotate more smoothly by providing simulated sine waves. The SLA7062 chip uses internal PWM to provide sinusoidal current waveforms to unipolar stepper motors. I have this working fairly well, but the PWM frequency is acoustically apparent and annoying.

Cat feeder improvements (video)

This is just a repost for people who are not subscribed to my youtube channel.

http://benkrasnow.blogspot.com/2009/08/improved-automatic-cat-feeder.html