Hi Richard, all. I have replaced the 1M pull downs on the doors with 100K pull downs. I also pulled up the R1 1K resistor that feeds the 1.25V to the A/D unit. The trace for the door runs onder this 1206 resistor, so I thought there may be a bridge under it. Well, there *may* have been. When I ripped it up I found some un-melted solder paste there... Well, I put another 1K resistor back there and I'm hoping this resolves it. I followed the discussion not so long ago about solder paste, and, since then I have not use ot for hand-soldering (I did a 'toaster-oven' project a while back that I used the paste for, and it makes life quite easy (or so I thought) even when hand-soldering. Well, if the problem goes away I will attribute it to the solder paste. If not, well, back to square one. I'll run it overnight and see in the morning. Attached is a small pic of the circuit (because I am quite happy with the etching process, etc. Hmmm, not attached, but posted here: http://www.flickr.com/photos/gus_goose/2623093614 Rolf Richard Prosser wrote: > Rolf, > > I'd also suggest stronger pulldowns than 1Meg on the door switches > (and capacitors), To minimise power consumption, maybe retain the 1Meg > resistors, but add 10ks to a "spare" pin and activate these only when > taking a reading. You should be able to figure out a way to use pin 5 > as the pulldown pin as it's only used once for code setting. (I > think). > > I was going to suggest swapping the connections from the "good" & > "bad" doors, but since the problem remains with neither attached, it > seems more a software or pcb problem than external hardware. > > Since it always (?) works OK for the first few hours, I'd suspect a > software, rather than hardware issue. > > Getting the memory banking wrong can lead to all sorts of strange > problems and I wouldn't have been surprised if your problem is now > fixed (But obviously not however, based on your latest email). > Possibly another, similar error somewhere? > > Richard P > > > > > 2008/6/30 Rolf : > >> Thanks... >> -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist