Stefan Bormann wrote:

> 2. A regulation of the RPM of a small dc motor. I thought of using the
> pwm feature of one ccp module to generate a pwm signal that
> drives the motor (buffered with a transistor) and use the capture
> feature of the other ccp module to measure the RPM with some kind of
> optical sensor.

I haven't worked on such things in twenty years, but I did a DC motor PWM
 control
project in the `70's (using an 8080!).  As I recall, the speed of a DC motor is
approximately proportional to the voltage across its brushes.

From ground, I placed the DC motor, a (lo-ohm hi-watt) resistor, a PNP
 darlington
transistor (with a diode in parallel), and then +12V.  I then placed an ADC
 across the
motor as my feedback.

Lower voltage = lower RPM = Increase the PW, etc.

If approximate RPM feedback is good enough, then this might save you a few
 bucks.

Hope it helps,

Michael

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