Newsgroups: comp.robotics
From: Leon@lfheller.demon.co.uk (Leon Heller)
Path: cantaloupe.srv.cs.cmu.edu!das-news2.harvard.edu!news2.near.net!howland.reston.ans.net!cs.utexas.edu!news.sprintlink.net!peernews.demon.co.uk!lfheller.demon.co.uk!Leon
Subject: Servo stability problem
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Date: Tue, 14 Feb 1995 22:34:19 +0000
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Many years ago I played about with a model control servo that I
interfaced to my TRS-80, without any problems. I've just attempted
to do the same thing using my PC, controlling the servo (a Hitec
HS-300) with the printer port. I've got a 68HC11 board I'll be
using eventually. For starters, I'm just sending the servo a fixed
1.2 ms or so pulse every 20 ms, which should be OK, but the servo
sometimes becomes unstable, and just oscillates, when I power it
up and send it the pulses. It stabilises if I hold it, however. I'm
using a stabilised 5 V supply, whereas the servo is rated at 6 V,
according to the box, but I don't think this matters too much.

Has anyone got any suggestions?

Leon
-- 
Leon Heller                       | "Do not adjust your mind, there is
G1HSM                             |  a fault in reality": on a wall
Email: leon@lfheller.demon.co.uk  |  many years ago in Oxford.
Phone: +44 (01734) 266679         |
