Astro DIY

EQ3-2 Stepper Motor Controller Mk 2

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EQ3-2 Stepper Motor Controller Mk 2
Doug: PIC based (running at 20MHz) bi-polar stepper motor controller driver for the EQ3-2 RA axis. Currently drives a 408 step mini-stepper see subsequent photo that is not really up to the job. Working on a mk 4 gearbox for a beefier motor. Timer resolution for purposes of step resolution is 100us. Runs off 9V-15V although motor runs hot. Basic functions include fwd/rev/stop and double speed. The default dead time (when no current flowing) is 63ms out of the 103ms step, but there is the ability through the switches to go to 100ms but it clobbers the batteries (8 AAs) as current with the Mk 3 motor approaches an amp.
Posted by Doug on January 14, 2010 Full Size|