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'servo'
2000\05\17@002659 by Greg Hartung

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Hi all...
  I am trying to control a servo with an 16F877.  Scope shows 1.5ms
@5v, 18.5ms @0v.  Servo just jitters its way clockwise (and accelerates)
til it hits the stop and keeps on jittering.  I have a separate 6v ps
for the servo.  Signal wire has a 4.7k pullup.  I have tried various
values from .5ms-2ms for the pulse and 17-20ms for the pause.  Same
results.  Thought perhaps the batteries should have a common ground.  If
I do that, tho, the scope shows 1.5ms @5v, 18.5ms @2v and the servo
doesn't do anything.
  Any thoughts?

2000\05\17@005531 by David VanHorn

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>values from .5ms-2ms for the pulse and 17-20ms for the pause.  Same
>results.  Thought perhaps the batteries should have a common ground.  If
>I do that, tho, the scope shows 1.5ms @5v, 18.5ms @2v and the servo
>doesn't do anything.
>   Any thoughts?

The servo power supply absolutely MUST have a common ground with the
controller.
Your observations tell me that the pullup is not needed.
Try a 1k series resistor between the micro and the servo.

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2000\05\17@085220 by Soon Lee

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Hi

anyone got program for controling 8 servo at one time

thanks

2000\05\17@090433 by Dale Botkin

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On Wed, 17 May 2000, Soon Lee wrote:

> Hi
>
> anyone got program for controling 8 servo at one time
>
> thanks
>

Yes...  check the PICLIST file upload section on the archive site.  I
uploaded servotst.zip, which is set up for four but very easily modified
for eight servos.  The timing is also easy to modify for higher
resolution, especially if you use a higher frequency xtal.  Source is in C
and asm.

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

2000\05\17@110549 by Albert Noah

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Check this site out. All schematics and software available for free.
Controls 8 servos.

http://www.rentron.com/SerialServo.htm

-----Original Message-----
From: Soon Lee <spam_OUTpslnTakeThisOuTspamCYBERWAY.COM.SG>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Wednesday, May 17, 2000 10:39 AM
Subject: servo


Hi

anyone got program for controling 8 servo at one time

thanks

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