This pic was the result of a quick study of linearity and sensitivity vs choice of resistor and just how
good a 10k thermistor (at 25 deg C) would work for sensing at 40 deg F. The thermistor B is about 4000.
The pic is temperature vs 10 bit AD count vs R2 (R2 is the upper resistor you have labeled R1 in your pic).
As R2 increases, the sensitivity goes down a little as the linearity gets better. It's not that different however.
Not sure what you mean there? I just figured he was looking for the typical technique for using thermistors for sensing temperature.
I also had to delete a pic until i fiind the right data that goes with it
Not sure what you mean there? I just figured he was looking for the typical technique for using thermistors for sensing temperature.
I also had to delete a pic until i fiind the right data that goes with it
In any case, the linearity and sensitivity comes into question and here is another pic to add to the data presented so
far for using a thermistor for sensing temperature. This particular application had to sense around 40 degrees F and
needed to be relatively linear within a range of plus and minus 15 degrees F from 40 degrees F.
The red line is perfect linearity, and the blue line is the actual response of the circuit as AD count using a 10 bit ADC.