Friday, November 10, 2006

Driving a Stepper Motor

Set up to drive a stepper motor I took out of a HP printer. I used a Parallax Boe-Bot Basic Stamp and a Darlington Driver 8-Channel ULN2803 DIP. The LEDs are to visually confirm that the input sequence is correct. Rather than activate one coil at a time, It is energizing 2 at a time per the nmb data sheet.

I did try sequencially running 1 coil at a time and it didn't work, it did twitch though. After using the nmb sequence it ran fine, but did get pretty hot, uncomfortable to touch. Maybee it is supposed to just run very short duration or maybee something in my setup is wrong.

Sunday, November 05, 2006

Cylon Eye Sweep

Fairly easy to implement, easy to program. 16 LED's don't quite fit though.