Debbie Hynes wrote :

> in the meantime, i'll adapt that excellent 555 design till
> i get the hang of using a PIC to generate 38kHz bursts.

Well that's *realy* easy.

I just setup the PWM module to produce the basic
36/38/whatever carrier. I then just flipped a bit somewhere
(I don't recal right now, could have been the TRIS bit...)
to enable/disable the PWM module.
Simple as that. When disabling/enabling the PWM, I synced
to the TMR2 overflow flag, so I always got a nice clean
carrier out without any half-cycles. The timing of the bits
was done in the TMR2 overflow ISR. Just counting up and
enabling/disabling when appropriate. 98% of the time the
PIC was just idling and waiting for the hardware do the work...

Now, since you insist on using that ol' F84, you might
have to do it the hard way...

Jan-Erik.

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