replace room thermostat by SONOFF

[JimmyH1969]

Hi group,

I have the idea to replace the room thermostat by a SONOFF Wifi switch. By messuring the room temperature and some LUA/Dzvents scripting it should be possible to trigger the SONOFF and switch heating On/Off i guess?

2 questions:
- Am i missing something in this idea/setup?
- Are there any SONOFF Wifi switches already flashed with ESPEasy available for easy integration in Domoticz?

Thank you All help is appreciated

[SweetPants]

2 questions:
- Am i missing something in this idea/setup?

Which Sonoff are you planning to use? The thermostaat is probably 24V so if using a regular Sonoff you need to modify it

- Are there any SONOFF Wifi switches already flashed with ESPEasy available for easy integration in Domoticz?

Not sure, I re-flashed my sonoff switches myself, you only need to solder a header to connect your serial UART (be aware it uses 3.3v, ESP's are NOT 5v tolerant)

[JimmyH1969]

Which Sonoff are you planning to use? The thermostaat is probably 24V so if using a regular Sonoff you need to modify it

Ah i see, i thought these where just relay boards, but they output the same as the input i guess?

Not sure, I re-flashed my sonoff switches myself, you only need to solder a header to connect your serial UART (be aware it uses 3.3v, ESP's are NOT 5v tolerant)

So that means i cannot connect it the USB port straightaway, or is that whats the header for?

[jake]

I would advice not to create your own thermostat script, but to use the svg Python plugin, or the dzvents version.

I use the Python version that I use to manipulate my existing iSense thermostat set point via the opentherm gateway. This makes the iSense react like on-off, while it remains an opentherm connection to the boiler.

[JimmyH1969]

So like i said, i just need a wifi relay switch. Would it be possible to connect this to domoticz you think?

https://www.banggood.com/Upgrade-5V-ESP ... rehouse=CN

[JimmyH1969]

I would advice not to create your own thermostat script, but to use the svg Python plugin, or the dzvents version.

I use the Python version that I use to manipulate my existing iSense thermostat set point via the opentherm gateway. This makes the iSense react like on-off, while it remains an opentherm connection to the boiler.

Good point. I'll use the script. The current thermostat is just a on/off thingy, not opentherm, so my guess is a relay should work...

[SweetPants]

So like i said, i just need a wifi relay switch. Would it be possible to connect this to domoticz you think?

https://www.banggood.com/Upgrade-5V-ESP ... rehouse=CN

I think you can, but you still need an USB-to-TTL serial port module to program it and a separate 5v powersupply. Be aware, this module is ESP-01 based and these modules have less memory ten ESP-07/12 based boards and this maybe not enough if you want to use OTA updates.

[JimmyH1969]

I solved it using a Qubino Flush 1D switch ZMNHND1. This device has "Dry Contacts" and perfect for switching something like this.

[jake]

So like i said, i just need a wifi relay switch. Would it be possible to connect this to domoticz you think?

https://www.banggood.com/Upgrade-5V-ESP ... rehouse=CN

I think you can, but you still need an USB-to-TTL serial port module to program it and a separate 5v powersupply. Be aware, this module is ESP-01 based and these modules have less memory ten ESP-07/12 based boards and this maybe not enough if you want to use OTA updates.

I followed this instructions to install tasmota on the sonoff:
https://youtu.be/ONFhXM5R-t4

No need for soldering etc or additional power supplies.

You have to control the sonoff than with mqtt