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Topic: "Sniffing" into a Boiler's LED panel (Central Heating) (Read 1 time) previous topic - next topic


Hi guys!

I've built aesp8266 thermostat to control my heating system. Everthing seems to be working fine for the moment  :)

What I want to accomplish is "sniff" or intercept the boiler status from the front panel's status LEDs, to see if this heater is actually turned on, on a MQTT Dashboard.

A very nasty way would be to connect some wires from the boiler's leds to some GPIO pins. But I'm not quite sure about that approach. i believe I would have to use some type of buffer, optoisolator, etc.
(I could also place a LDR, o phototransistor in from of the boiler's LED, but I dont want to physically block the visual feedback)

How could I accomplish this?
Any ideas?

Appreciate your help,


Can you put another temp sensor on the boiler water output pipe to detect when the boiler runs ( pipe hot )

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