Xref: utzoo sci.astro:11045 comp.sys.ibm.pc.hardware:4113
Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!att!cbnewsl!jfbn
From: jfbn@cbnewsl.att.com (james.f.burnell)
Newsgroups: sci.astro,comp.sys.ibm.pc.hardware
Subject: Re: Device Drivers for Astro Photography
Summary: Stepper Motor Driver
Message-ID: <1990Dec28.231739.7008@cbnewsl.att.com>
Date: 28 Dec 90 23:17:39 GMT
References: <22158@ttidca.TTI.COM>
Followup-To: sci.astro
Distribution: na
Organization: AT&T Bell Laboratories
Lines: 23

In article <22158@ttidca.TTI.COM>, troeger@sequoia.tti.com (Jeff Troeger) writes:
> fuzzes up my pictures. Can you recommend any application notes in 
> the data books or text books on writing device drivers for stepper
> motors (pulse duration, waveforms, etc.)? I know the manufacturer's
> data books are full of them, but I can't remember where. 
> 
> I know how to do the analog circuitry, how to design the ring counters,
> and how to get the bits in the ports to switch the transistors. I
> just don't remember what the wave forms are s'posed to look like, 
> and how often they change.

Motorola makes a really nice stepper motor driver chip, the MC3479. The Linear
and Interface data book shows the stepper waveforms. I was given a crate of
about 30 really nice stepper motors a couple of years ago, and recently I
started playing with them with the intent of designing a 2-axis stepper motor
drive for a telescope. I would be interested in hearing what advice people
offer regarding a stepper drive design. Would anybody who has any thoughts
please post your replies.

Thanks

Jim Burnell
AT&T Bell Labs