> > > Now a thermistor, it simply generates a voltage > as a divider with a source impedance of course. As the temperature > changes, the voltage that > is > generated across it changes, and the resolution > of what you can measure is going to be dependent on the source voltage as > well > as the ADC resolution. > What value is the fixed resistor in the divider circuit? It's been a few years but I seem to recall a homework question about picking the best fixed resistor to optimize the output delta of the thermistor. As memory serves, the optimum choice was a less than intuitive solution. -Denny --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .