I have a solar water heater for my pool. It has two temperature sensors attached to a control unit. The control unit has access to AC power - and the pump used to pump the water through the solar cells is connected to this controller.
The controller reads the pool temperature, then the roof sensor, and then if there is enough of a difference and the pool has not reached max temperature it will start the pump to heat the water. It’s basically identical to this unit: http://www.ebay.com.au/itm/PoolMasterpro2-Solar-Pool-Heating-System-Pump-Digital-Controller-Aquasun2-Dontek/121501974324?epid=1190483235&hash=item1c4a14ff34%3Ag%3A5IcAAOSw44BYR84z
I want to read the two sensors whilst leaving them connected to this unit. Essentially piggy backing these connections and hooking them to an esp32 or esp8266, then publishing them over MQTT.
I want to know - is it feasible to connect the sensors to my own device? IS there some principle I’m not aware of that makes me reveal my n00b status?