# Wirsbo 433 transmitters for floor heating
**URL:** https://community.homey.app/t/wirsbo-433-transmitters-for-floor-heating/102535
**Category:** Questions & Help
**Tags:** rf-433
**Created:** [January 28, 2024, 1:01pm UTC](https://community.homey.app/t/wirsbo-433-transmitters-for-floor-heating/102535 "2024-01-28T13:01:58Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Jon\_Magne\_Soltveit\_G](https://community.homey.app/u/Jon_Magne_Soltveit_G)
#### Post date: [January 28, 2024, 1:01pm UTC](https://community.homey.app/t/wirsbo-433-transmitters-for-floor-heating/102535/1 "2024-01-28T13:01:58Z")
I have a wirsbo floor heating system with transmitters tja commuicates with 433mhz. The transmitters Are marked «Cozy Radio» wirsbo artnr 80440 and f.ex. ID0413 - 433,7 MHz.
The receivers look like this:
The transmitters are nor produced anymore, and I was hoping to control the system via Homey rather than buying new controllers. But I cannot find a way to add or control the 433 thermostats in Homey. Grateful for any hints or guidance 😉
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### Author:  [@ZeroBite](https://community.homey.app/u/ZeroBite)
#### Post date: [June 10, 2024, 7:12pm UTC](https://community.homey.app/t/wirsbo-433-transmitters-for-floor-heating/102535/2 "2024-06-10T19:12:14Z")
I know this topic is rater old, but I stumbled on it - and since no one else posted a reply I might as well do it…
Anyway,
We have this exact same system in our house, and for (almost) the same reasons as you, I took a stab at it last year.
It turns out that it’s quite simple actually!
It’s a one way system, so you won’t be able to control it unless you create your own transmitter - either from salvaged parts, or program your own 🙂
In the latter case, you might as well buy a WIFI operated 24VAC switch system to open/close the actuators.
Each wireless thermostat wakes up once ever 10-15 minutes, measures the temperature, integrates it with the last x measurements - and decides whether or not heat is needed.
In either case, a small packet (~35 bits @ 2500 baud) is sent to the receiver using basic FSK (I think).
The packet is sent 3-4 times with a delay of 10-11 seconds between each, YMMV.
The packet contains the unique ID of the thermostat, whether or not heating is requested, and the current setting of the night time temperature switch - that’s it!
Furthermore the packet is prepended with a preamble to ‘wake-up’ the receiver, and contains start/stop bits and basic parity checks.
Also worth mentioning is that the RF receiver circuit in the controllers actually contains a signal-strength output, but this isn’t used by the microcontroller at all.
Like yours - our system contains an extender unit, but when this malfunctioned I salvaged the RF receiver and programmed an ESP32 based WIFI/MQTT gateway from the parts.
Now I can at least monitor when each thermostat calls for heat in Home Assistant 😃
Note that the above info might not be 100% accurate, so use it as is and make your own observations 😉
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### Author:  [@Jon\_Magne\_Soltveit\_G](https://community.homey.app/u/Jon_Magne_Soltveit_G)
#### Post date: [June 14, 2024, 10:54pm UTC](https://community.homey.app/t/wirsbo-433-transmitters-for-floor-heating/102535/3 "2024-06-14T22:54:07Z")
Tnx for sharing. The answer was way above my level, but Tnx anyway 😉