Newsgroups: comp.robotics
Path: brunix!cat.cis.Brown.EDU!agate!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ah991
From: ah991@FreeNet.Carleton.CA (Herman Van Den Bergen)
Subject: Re: Problem with PW driver from PC
Message-ID: <Cv7vC1.G7D@freenet.carleton.ca>
Sender: news@freenet.carleton.ca (Usenet News Admin)
Reply-To: ah991@FreeNet.Carleton.CA (Herman Van Den Bergen)
Organization: The National Capital FreeNet
References: <33iegl$q7r@io.salford.ac.uk>  
Date: Sat, 27 Aug 1994 23:16:48 GMT
Lines: 19


In a previous article, j.w.d.boucher@aeromech.salford.ac.uk (J.W.D.Boucher) says:

>At the moment Im trying to drive some small precision position servos 
>using a pulse width modulated signal from a PC.  Im using a Digital 

Just an idea, if you don't want to tangle with uControllers...
You could design a little hardware around a programable counter,
like the 2240/8240/ICM7240 and the like. Set up the reset count
using the output lines from the parallel port to make it give a
duration with a resolution of 1 in 255. Use a oneshot to make the whole
thing cycle. I believe the RC servos only respond to either the up or
down part of the signal??? So a oneshot could space them nicely...
Don't call me if it does'nt work ;-)
Best regards, Herman

--
*   Herman van den Bergen    Bitnet  : vdbergen@uottawa.bitnet     
*   Compuserve: 71553.64     Internet: vdbergen@acadvm1.uottawa.ca
