Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!amdahl!pacbell!att!mcdchg!mcdphx!citek.UUCP!hbg6
From: hbg6@citek.UUCP (John Schuch)
Newsgroups: sci.electronics
Subject: Re: Stepper Motor Help
Message-ID: <12557@mcdphx.phx.mcd.mot.com>
Date: 2 Mar 90 18:42:13 GMT
References: <AZvKRje00WBLQ1zFUy@andrew.cmu.edu>
Sender: listen@mcdphx.phx.mcd.mot.com
Reply-To: hbg6@citek.UUCP (John Schuch)
Organization: Motorola Microcomputer Division, Tempe, Az.
Lines: 21

In article <AZvKRje00WBLQ1zFUy@andrew.cmu.edu> tf0z+@andrew.cmu.edu (Todd Andrew Ferrante) writes:
>I have a number of small stepper motors I want to use for a robotics


Look up the Motorola part SAA1042 ( or SAA1042A ). It is a stepper motor
driver ic. It drives two coils with no common lead and provides inputs
for CW/CCW rotation direction, full/half step, and a clock input which
determines speed of rotation. There is also some bias nonsense but the
data sheet will explain that. It directly drives steppers from 5 to 12 Vdc.
The 1042A can drive 24Vdc motors.

I've set one up to run off of an XT serial port using a simple serial
to parallel converter published in one of the trade mags. The parallel
output lines go to the CW/CCW, full/half, and clock inputs. This lets
me control two steppers via one serial port. I move the motor one step
by fliping the clock bit. At 9600 baud the motor moves fast enough for
my needs.

If you can't find the data sheet, Email me and I'll see what I can do.

John