Ok so i would use 2 18650s ( 2000mah and 7.4v in series). Lets say the gauge is 20 and i got 2 ft of nickel.
DVDdoug thank you for that but i forgot to include the fact that resistance would change. I will use a potentiometer as a knob to set a temperature on the screen, and the program should match that certain temp to the respective resistance and run a loop to make the chamber reach that resistance(and thus temp). Plus i want the program to also display the "current" temperature, so i need the arduino to read the resistance in real time.
I found this Precision LM4040 Voltage Reference Breakout - 2.048V and 4.096V : ID 2200 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits Can i use this voltage sensor as a reference and hook it up to the same battery? Ive also seen actual voltage sensors, same thing, can i hook em up to the same batteries and still get voltage readings? Thanks