Chris Miller wrote: > I have Pic event timer circuit that needs to operate very close > to a high performance automotive ignition system. I have wire > wrapped my prototype and tested near the ignition system. As > soon as the ignition fires my circuit triggers. How long does the signal last you are trying to receive? What you could do is save the time of the first trigger and a *small* time later test it again - and then again. More if you like. If it is still there... it was a good one. If not it was a spike from the ignition. Brian. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu