I have an oil boiler with a defect temperature sensor. The sensor is just a piece of bend wire, and it is now in 2 pieces. The sensor is probably custom made and the manufacturer does not exist any more. I guess the electrical resistance in the wire changes with temperature.
My question is if it is possible to replace the damaged sensor with a digital variable resistor controlled by my Arduino. Then I can use a K type or J type thermocouple, which I have, to read the temperature in the boiler and send this signal to the Arduino. Then the Arduino can "translate" this signal and control the digital resistor connected to the electrical circuit in the boiler.
I guess I need an IC for the K type Thermocouple and a digital variable resistor replacing the damaged sensor. Do I need any more parts? Any thoughts on how or if this will work? I have an Arduino Duemilanove, if it matters.