>Don't know why it's not working for you, but you're smart so I imagine >you'll squash the gremlin. I've got my BFH ready for that event. It appears that the low threshold voltage is jittering, but sometimes it's practically at ZERO, and that makes no sense at all. I can't believe that my little 2 instruction loop is introducing any real latency. A couple of counts, yes, but that's why I am using a 16 bit measurement on the discharge time, and a large-ish 8 bit "1" value. -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.