I'm working on my home monitoring system and already succeed with electricity consumption measurement and got closer to water system.
Measuring water consumption is almost solved, but as we are using boiler almost 365 days a year I would like to measure water temperature in a tank as well to have more info on it.
As the tank itself is tightly isolated I've got an idea to intrude into boiler and use it's temperature sensor.
Water heater has electronic (buttons) control (model ARISTON VELIS 50)
Under the hood it looks like this (2 tanks)
And temperature sensor for this model is the following
As it seen on the picture the left thermostat has 3 wires which I suppose are:
whereas the right tank has kinda 4 wires going out the same place.
- if its possible to know how to read the temperature data from 3 wires sensor or how to know the "protocol" its using for data transmission?
- is it possible to intercept this data not interfering with the boiler board?
Maybe there are some traditional/known approaches for such kind of tasks or this is regular temperature sensor, but I don't have a clue what to start with bec. organizing a workspace under the boiler not knowing what to do is quite uncomfortable.
Unfortunately I don't have an oscilloscope to read raw signal, but I have both Arduino and RaspberryPi3 and multimiter in my arsenal.