My Home Assistant server is monitoring several thermometers I have distributed around the house. I created a select input that allows me to select one of those thermometer and an automation sends via MQTT the temperature of such thermometer.
A ESP8266 board gets that temperature and configure the DS3502’s wiper to adjust the variable resistor to a value that is equivalent to a thermistor 15K and B=3480.
That allows me to fool the Ecodan with the temperature it’s seeing via CN20 connector.
@Eduardo_G.D this last piece of info is awesome. I will try to fool Ecodan between my boiler and hot tub. Can you share the code for the ESP of how exactly it gets the temperature and sets the DS3502’s
Also can you please share the link to the DS3502. Thanks