Newsgroups: comp.robotics
Path: brunix!sgiblab!swrinde!cs.utexas.edu!howland.reston.ans.net!torn!news.unb.ca!csd.unb.ca!michael
From: michael@jupiter.sun.csd.unb.ca (Michael Thompson EE)
Subject: PWM speed controllers
Message-ID: <1994Mar25.143905.27097@jupiter.sun.csd.unb.ca>
Organization: University of New Brunswick, Fredericton, NB, Canada
X-Newsreader: TIN [version 1.1 PL8]
Date: Fri, 25 Mar 1994 14:39:05 GMT
Lines: 29

Has anyone used the Motorola 34060 pulse width modulation chip to 
make a bidirectional electronic speed control for a dc motor? I've 
used it to switch MOSFETS and thus control speed in one direction 
but don't know how to use a PWM i.c. to provide bidirectional control.
Could I use two of them to get two outputs to drive an H-bridge?

Has anyone use the Motorola servo chip for the above purpose? I know I can 
use an 8031 and its timers provide PWM signals to an H-bridge but don't
want to use a microcontroller just for a speed control. Oops, I forgot 
to mention that I want to use the output of a R/C receiver for the control 
signals for the PWM circuit.

Finally, does anyone know of a PC based C compiler that produces INTEL
hex code that could be downloaded into an EPROM? For the Microprocessor 
Design course the students write their monitor program for their 8088
boards in asssembler but we'd like to do it in C instead. 

Thanks for your help!
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Michael G. Thompson
Electrical Engineering Dept.
University of New Brunswick
Fredericton, New Brunswick
Canada  E3B 5A3

mgt@unb.ca

"Even the dead love a parade..."
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