how to compare to analog signal.... pic184f331

hi friends ,

i want to compare to analog dc signal & want 2 change the duty cycle of PWM according to the error signal... how can i do that??

if someone having C code... plz help me....

You setup the A/D, run the conversion, get the numbers out of ADRESH & L, scale them with a multiply instruction, offset them them with an add or subtract, then load them into the PWM registers.

Usually. If a linear relationship won't do it, you may have to write a big lookup table. If the whole thing needs to be a PID loop, that's even more fun. Start with the basic linear function, though.