Trying to accurately measure the temperature of a heat sink using the KL25 FRDM board with an attached daughter card. The thermistor is a 10K series from Vishay and so I bias it to 3v and use a pull down resistor recommended by Vishay. I need to measure within a few degrees of accuracy from 70deg C to 100deg C. The problem is the ADC bounces all over the place. I have tried averaging, throwing out an errant reading, etc. but I still do not have a stable solution. I capture 16 bits from the ADC then throw out the least 4 bits. I even tried to look at just 8 bits of accuracy. Is there something I am missing?
Also I only need to capture 32 steps along that range.