I second the thermistor vote. I've been using some US Sensors parts for high accuracy and interchangability (0.1c) applications recently with great success. These puppies cost about USD5.0. But your specs can be done for about a buck; including the passives. :) -marc On 5/21/08, Spehro Pefhany wrote: > At 09:35 PM 5/20/2008, you wrote: >>I need a low cost (in qty) way to sense room temperature. I tagged this >>as [PIC] as I'm looking for a solution which is low-cost when >>considering interfacing to the PIC processor. >> >>Right now I'm bit banging a DS18S20 (had a library) on a PIC18F part for >>development purposes, but this is a bit pricey and sometimes hard to find. >> >>My goals are as follows: >> >>1) 3.3V (this is a biggy-it seems some of the more popular sensors need >> 5V+) >> >>2) Cheap and easily obtainable. Mouser stocking it is a plus. >> >>3) No calibration required to obtain accuracy within a few degrees >>(solder and be done). >> >>4) Ok to use about any resource on the PIC. I have ADC ins and spare >>I/O pins available. The SPI interface is somewhat tied up with a couple >>of other devices which are fairly high-bandwidth, but I could do a SPI >>sensor if need be. I2C not so much, although I guess I could bit-bang >>i2c as well. >> >>5) Through hole packaging. No SMD-only parts. >> >>6) -40*F to well over 120*F. The idea is to monitor likely temperature >>ranges for outdoor enclosures. >> >>Ideas? >> >>-forrest > > Thermistor. Just like just about every consumer thermometer in the world, > probably billions by now. > > Best regards, > > Spehro Pefhany --"it's the network..." "The Journey is the > reward" > speff@interlog.com Info for manufacturers: http://www.trexon.com > Embedded software/hardware/analog Info for designers: http://www.speff.com > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- Sent from Gmail for mobile | mobile.google.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist