> > If the duty cycle needs to be controlled, using a timer interrupt as
> > Jinx suggested may simply things.
> 
> Of course, but still more complicated than using the CCP module.

Until / unless Philip gets a PIC with PWM he doesn't have that option

Philip - sample away lad

> In your opinion, would this be easy enough for a beginner to do in
> assembly, or should I just stick with one of the C variants?

The timer foundation would be fairly straightforward in assembly. It
will get more involved if this sensor you're trying to emulate has fine
variability and you have to be extra-careful with code timing. Get
something working in what ever language you feel comfortable with,
then play around

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