Nick, My only experience with sensors is for pressure type. In my experience there was a circuit that sensed a depth and there were precision resistors that would set the minimum depth and the other would set the span. I looked in the "programming and customizing microcontrollers" book I'm reading and the digital thermometer experiment. Based on this and my experience with thermistors in sonars, there is usually an external circuit to calibrate the variations in actual components. Also, I'd be curious to know if the measured voltage with a DMM (usually around 10megaohms/volt sensitivity) is supposed to be the same as the in-circuit voltage of your device which surely would have a higher current drain? The PICmicro book warns about the thermistor being too close to a warm microcontroller also. Regards, Mike/ke6cvh ----- Original Message ----- From: "Nick Veys" To: Sent: Wednesday, July 25, 2001 2:40 AM Subject: [EE]: LM35 Woes > Greetings :) I'm having trouble with some LM35 Centigrade temperature > sensors... I'm simply trying to read them w/a multimeter and getting > annoying values. The Vss and Gnd are 5.12 and 0 respectively, and when > I go to read the Vout, I get between .667 - .733 V. Meaning my room is > a toasty 66.7-73.3C. Quite warm! This is happening with 3 separate > sensors! Not sure what my problem is... Any tips? Perhaps I'm reading > this totally wrong? > > nick@veys.com | www.veys.com/nick > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu