I thought I'd see if I could hook up this sensor from a junked humidifier and get some readings but I've hit a snag, as in I can't identify the thing. It connects to a satellite board with the controls and indicators - which goes on to the main board where a microcontroller lives.
I made up this schematic:
The resistor RT does respond to temperature changes. My finger can get it from over 100kΩ down to ~87KΩ.
The humidity sensor only reads open and there are no markings of any kind on it. Is it possibly a 1-wire device? Any way to test and find out? Any opinions on whether there's a future in this?