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[DPRG] PWM device/circuit?
Subject: [DPRG] PWM device/circuit?
From: W. P. McGown
bmcgown at bellsouth.net
Date: Mon Jun 11 13:56:09 CDT 2007
The Hermit on the Bayou received this communication from "Eric Sumner" who
said:
>> I am using a Parallax Stamp to perform input processing, motor control (PWM)
>> and a few other chores. I would like to put a device between the stamp and
>> the H-Bridge which would accept a serial input from the stamp that would
>> then be converted to a PWM signal for the H-bridge so I could relieve the
>> stamp of the chore of doing the PWM.
>>
>> Something like the stamp sends a decimal 128 and the PWM signal is 50% duty
>> cycle... A 256 would give a 100 % duty cycle.
>>
>> Any suggestions would be greatly appreciated.
>
> I'd look into using a 555-based PWM circuit, and using a digital
> potentiometer to interface it to your Stamp.
>
> -- Eric
Thanks for the suggestion!! I had thought of the 555 but not coupling it
with a digital pot! Would you have any suggestions as to one that works off
of 5 volts? I am trying real hard not to get to many different power
supplies going here. Right now I only have 5vdc and the motor supply.
Thanks again,
Bill
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