ADC readings doesn't match voltage reading
Posted: Thu Nov 19, 2015 7:42 pmHi guys!
Im a software developer, making my first baby steps in the HW world
learning as I go.
Trying to connect a Thermistor to the ADC input, with strange issues... My Thermistor is 10K, I used a voltage devider with the Thermistor as R2 and 110K Ohms as R1 (3.3V). The Thermistor is -20 to 100C, assuming its 10K at 25C I figuered its 100K at -20. Anyway, The problem is that I get different ADC readings then the actual voltage.
For example, I get 0.297 on my volt meter (room temp, around 23-24C) but the raw ADC value is 240 (out of 1024), this does not make sense... its should be around 300~
Any help is appreciated
Im a software developer, making my first baby steps in the HW world
learning as I go.Trying to connect a Thermistor to the ADC input, with strange issues... My Thermistor is 10K, I used a voltage devider with the Thermistor as R2 and 110K Ohms as R1 (3.3V). The Thermistor is -20 to 100C, assuming its 10K at 25C I figuered its 100K at -20. Anyway, The problem is that I get different ADC readings then the actual voltage.
For example, I get 0.297 on my volt meter (room temp, around 23-24C) but the raw ADC value is 240 (out of 1024), this does not make sense... its should be around 300~
Any help is appreciated