Newsgroups: comp.robotics
Path: brunix!news.Brown.EDU!noc.near.net!howland.reston.ans.net!gatech!taco!eos.ncsu.edu!rmlegran
From: rmlegran@eos.ncsu.edu (RICHARD MARK LEGRAND)
Subject: RC servo control dilemma 
Message-ID: <1993Sep28.221037.6975@ncsu.edu>
Sender: news@ncsu.edu (USENET News System)
Organization: North Carolina State University
Date: Tue, 28 Sep 1993 22:10:37 GMT
Lines: 26

I think this is a FAQ, but it doesn't appear in the FAQ list.  I would
like to control an RC servo (the one's by Futaba and the like) via a
parallel digital signal (4 bits will do).  

All I know at this point is that the RC servos require a pulse width 
modulated signal with a variable duty cycle.  I'm pretty sure that 
such a signal can be generated using a 555 pulse generating circuit, 
but I'm unsure how to control the duty cycle (and hence control the 
servo) with a digital input.  

With or without the 555, if anyone knows how to do this with low 
hardware overhead, please let me know.

Thank you,

Richard LeGrand
North Carolina State University
Center for Robotics and Intelligent Machines 

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