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PICList Thread
'Control a Motor'
1997\05\01@075836 by Osama ALASSIRY

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What would the easiest way to control the speed of a small motor (from a
R/C car) using a PIC16c84?
I tried using PWM but it's too complicated (and I need the timer for
something else)

thanks,
_____________________________________________________
Osama ALASSIRY  spam_OUTosamaTakeThisOuTspamqatar.net.qa .....osamaKILLspamspam@spam@alassiry.com
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1997\05\01@100533 by wft

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Osama ALASSIRY wrote:
>
> What would the easiest way to control the speed of a small motor (from a
> R/C car) using a PIC16c84?
> I tried using PWM but it's too complicated (and I need the timer for
> something else)
>
> thanks,
> _____________________________________________________
> Osama ALASSIRY  osamaspamKILLspamqatar.net.qa .....osamaKILLspamspam.....alassiry.com
>                               http://www.alassiry.com

Without tying up lots of I/O pins or adding more chips, you are stuck
with PWM.  PWM can be done programmatically as well as in PWM hardware.
Depends on what else you have going on in the PIC.

If you are willing to add chips, you can use a serial interfaced DAC
with a driver after it.  This will use at least two I/O pins.

Gus Calabrese
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1997\05\01@162706 by David W. Duley

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In a message dated 97-05-01 16:07:33 EDT, you write:

<<
What would the easiest way to control the speed of a small motor (from a
R/C car) using a PIC16c84?
I tried using PWM but it's too complicated (and I need the timer for
something else)

thanks, >>
I am not sure that I agree.  I use PWM on the 16C84 all the time.  It was
quite easy.  I use a simple interupt routine.  On one version I even handle
RS232 and control the PWM using a simple serial command set.
I am controlling airflow, pumps and even an H bridge to give me a
bi-directional Dc motor.
What else do you want to use the RTC for?  Could you also handle this
function inside the interupt routine?

Dave Duley
V.P. DreiTek Inc.

1997\05\01@194618 by rrose

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> Without tying up lots of I/O pins or adding more chips, you are stuck
> with PWM.  PWM can be done programmatically as well as in PWM hardware.
> Depends on what else you have going on in the PIC.
>
> If you are willing to add chips, you can use a serial interfaced DAC
> with a driver after it.  This will use at least two I/O pins.

Gus,

Do you care to recommend/identify some drivers?

TIA,



Richard Rosenheim
KILLspamrroseKILLspamspamaccessnv.com

1997\05\02@035900 by Osama ALASSIRY

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What PWM frequency are you working at? What freq. is acceptable to drive
such a motor?
----
From: David W. Duley <RemoveMEDREITEKTakeThisOuTspamAOL.COM>
To: spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU
Date: 2 May 1997 5:44 AM
Subject: Re: Control a Motor

>I am not sure that I agree.  I use PWM on the 16C84 all the time.  It was
>quite easy.  I use a simple interupt routine.  On one version I even
handle
>RS232 and control the PWM using a simple serial command set.
>I am controlling airflow, pumps and even an H bridge to give me a
>bi-directional Dc motor.
>What else do you want to use the RTC for?  Could you also handle this
>function inside the interupt routine?
>
>Dave Duley
>V.P. DreiTek Inc.
>

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