I'm using an ESP32 and a NTC food probe I want to read temperature for my BBQ.. I did look at few web page about NTC probe, it but I'm lost. I did played with ADC back in 1980 so let say that the theories are lost is the memories
I want to read the resitance value of an NTC food probe. Idealy, I would like to read it using a knonw max value, the smalless the better. The actual reading is about 250 k at 0'C and around 12.5k at 100' C
Can I set an external reference voltage?
If not, what is the reference voltage of the ESP32 ADC
Should I use an OP-AMP to interface the probe tp the ESP pin. If I recall, I did use that back whan I was in college
What would be the electronic circuit to hook-up the probe?
If attached directly to a pin, should I use any protection to prevent any problem to the processor?
Any help or bit of information trully appreciated
P.S. excuse my English.