AlainD

50-100cm No idea about AREF. I just temp calibrated the system after assembling. I give 5ms output high (more than enough to fill an external 47nF capacitor, 2ms should be enough) and do 5 measurements with delays of 100microseconds (more than...

Why not setting a output to high to power a voltage divider with a NTC and a fixed resistor? Simple and I have it working. No need for MOSFET's. I take the median of 7 readings to avoid noise.