>   I have never used a hardware PWM port on the PIC before and am wondering if that is a more
>   efficient way to go than to generate the 38khz in software.  I have been looking specifically
>   at the PIC16F628.  I have 2 questions for the group. 1) Do you recommend using the hardware PWM
>   for the modulation to simplify coding and 2) What is the "appropriate" way of turning the
>   38khz on and off?  

1) unless you have something else for the chip to do, I would suggest 
generating the carrier in software. It is pretty trivial, just 
blink-a-led but a bit faster.

2) how about setting the I/O pin to input?

-- 

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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