Hi guys,
I want to share with you my workaround integration of my old wired thermostat Computherm Q7 with Home Assistant.
The thermostat was unused(because it’s wired one and I have another one with RF) and I want to transform it into a “smart one”.
After few weeks of thinking how to make it WIFI/RF but without putting it on the wall(keep it on the table) and low power consumption I found a solution that is in testing right now and seems to work after few days.
The solution I choose is Bluetooth BLE anti-lost device (1$ on Aliexpress) and bluetooth_le_tracker from HA.
The anti-lost device I had in house works with 3v battery cell but the challenge was that the device need to be powered on by pressing a button for few seconds.
But if you keep it too much it just power on 1 second and power off so the idea to solder the push button always on fail.
From my basic Knowledge in electronics I know that an electrolytic capacitor placed in series with a consumer behaves like a push button until it charges. Somehow simulates a short for a period, it depends on how big this capacitor is.
This was my idea for the moment maybe there is another way to make this st17h26 ic auto power on. (maybe someone had another idea)
The best capacitor for my need after several test is 22uF 63v.
So I took + and - from the thermostat battery and the + I passed it from the thermostat relay used for 220v to start the heater.
I remove the buzzer from the BLE anti-lose device because it was just annoying.
After few test I saw it in my Home assistant as iTag ble device.
So the idea is to use it as a trigger for a ESP8266 wifi relay that will stay next to the heater(gas one in my case) and when iTag is “Home” will trigger the relay and when “Away” will close the relay.
What do you thing about this?
Could be a way to integrate some old device like this thermostat or like a PIR sensor, smoke sensor, wired interphone into HA?
