Felix, Did you get any answers to this posting - I have just happened across it while doing a mail search. I have done some work on X-10 with the PIC, (shades of "explosion rocks mid west..." coming back here) what kinda ideas are you after - I may be able to help. Paul Fletcher. > felix centeno wrote: > > Hi, I'm design a home appliance like X-10 but using 250 khz and > sending 9 bit > in digital form (NRZ) using a 16F84, and detecting zero crossing to > sent and > recive data thru 120 V AC power line, has somebody ideas to share ? >