HWPWM and 4 motors

[Darrel Taylor]

Hi Nick,

Taylor made to your request, 2 years in advance.

Multiple Slow speed Software PWM
http://www.pbpgroup.com/modules/wfse...p?articleid=12
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[Macgman2000]

The 16F684 is a 1/2 or full bridge driver. It will only output PWM on 2 ports and give steering logic to activate an H-bridge (FWD / REV). Has anyone used it to put out 4 PWM signals? I don't think it is possible per spec sheet.

Best Regards,
Nick

[Darrel Taylor]

You are correct!

You can only get 2 PWM's from it.

The ECCP does have several outputs. But, they can not be configured to output different frequencies or PWM dutycycles.
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[fanie]

If you want more PWM's have a look at the 18F2431 - sports up to 4 PWM's with complimentary outputs...

[Darrel Taylor]

Now that's a Cool chip.

I can't believe I haven't seen it before.

Wow, all those PWM's, and Capture channels.
Built in Quadrature Encoder Interface.
Super Fast A/D.

And everything else a good 18F would have.

Geez, where have I been..

Thanks fanie!
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[mister_e]

I have to agree it's a nice PIC even if it's hundred times too big for a so simple task.

Sorry to be a pest but, the Darrel's Link or the interrupt based routine is still the cheapest solution and will learn you something.