Den 2008-01-16 19:18:49 skrev Timothy Weber : >> o I have used analog 10mV/C TO92 sensors (LM35?) for simple straight analog cirquitry. >True. At the end of a cable going through some other machinery that was > possibly noisy, I felt better with a digital sensor - if the checksum is > bad, you know there was a transmission error; there's no such failsafe > with analog or PWM output. Right. The trick with analog voltage sensor however is to use four wires; two GND connected only at LM35. One for power, and one for signal reference. More precisely, use three wires + screen; and use screen as GND power. (the other wires in th ecable are positive supply, and output voltage) -- Morgan Olsson -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist