I have two thermal sensors from a wireless (433 mhz) thermometer system that I would like to an Arduino Uno. There are no external markings and it is sealed in a stainless steel tube. (Sealed is good, because I want to use it under water.)
I know that the sensors work on the old thermometer system, which has a battery operated base station and two remotes. I can hold the sensor and see the temperature rise on the wireless system as expected. When I connect the same sensor to my Arduino Uno (A1 or A2 or A3) I read a voltage, but no change when I hold it in my hand. I tried Pinmode(input) and pinmode( input_pullup. I have tried 5v and 3.3v drawn directly from the board.
1 - Any thoughts on how I can change the circuit to be able to see a change? Resister?
2- Any thoughts on how I can calibrate the value (that I hope to see) into a usable value for degrees?