On Fri, 4 May 2001, Dave Dilatush wrote: > Bob wrote... > > >I don't know what your talking about (Willis), about using a light > >bulb to sense load output (sounds pretty "Rube Goldberg'ish" to me). > > "Rube Goldberg'ish"??? Jeepers creepers, Bob, that circuit has only > THREE flippin' parts in it, and they're all passives!!! What's to not > understand? > > Alright, let's make it simpler: I'm going to knock it down to TWO > parts for you. Hang on to your hat, and read slowly and carefully. A "zero" part solution (the way you're counting parts) would be to glue the pic directly to the heat source and configure it to run in "RC" mode. The internal RC oscillator has a strong, but repeatable temperature coefficient - you only need to calibrate it. Not too practical perhaps, but it is fewer parts! -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.