Thanks for all the help - I will look into doing it with PWM - The crystal I plan on using is 20MHZ (just to make sure - the crystals decoupling? caps should be around 22pf right?)
One other thing which may be a tad off topic -
I know I should go off the data sheet of the IR LEDs but I was wondering if either of you knew if the PIC would be strong enough to drive two IR LEDs in series or if they should be driven separately - one on each PWM pin or if I would need to use a transistor to drive them. The maximum current the PIC is supposed to source/sink per pin is 25mA but I was curious as to if it would be enough.
I am not looking to have it pick up obstacles at a real long range maybe 3 - 6 inches tops.
Thanks again for the help
edit: thanks for the links mister e
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