Robotics, Motor Controllers (post 2)

Archiver

Hey,

Thanks for the advice. But I'm still confused. I'm using the BS2P
(40 pin model) and I was told that all Stamps are mono-tasking, that
you can only control one pin at a time. So if i use PWM on a
certain pin doesn't that mean I can only control one motor at a
time. I was hoping that I could send a signal to the H-bridge for a
short time (say 0.1 seconds or shorter) and it would continue at
that speed until I send another signal to it. But if a have PWM
doesn't that mean that I have to have the command to control that
pin for the entire duration of having the motor on?

Thanks
James

Archiver

At 09:17 AM 10/4/03 +0000, ensignkim113 wrote:
>Hey,
>
>Thanks for the advice. But I'm still confused. I'm using the BS2P
>(40 pin model) and I was told that all Stamps are mono-tasking, that
>you can only control one pin at a time. So if i use PWM on a
>certain pin doesn't that mean I can only control one motor at a
>time. I was hoping that I could send a signal to the H-bridge for a
>short time (say 0.1 seconds or shorter) and it would continue at
>that speed until I send another signal to it. But if a have PWM
>doesn't that mean that I have to have the command to control that
>pin for the entire duration of having the motor on?
>
>Thanks
>James
Hi James -

Multiple PWM can be achieved in a couple of different way, but all off-Stamp.
One option is the PWMPAL which Parallax offers here on their web site:
http://www.parallax.com/detail.asp?product_id=28020

The other alternative is the PAK-5 Processor which Al WIlliams offers here:
http://www.al-williams.com/pak5.htm

The PWMPAL offers 4 channels of PWM, and the PAK-5 offers 8 channels of PWM.

Regards,

Bruce Bates





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