Wirsbo/Uponor thermostat replacement

[Hoffan]

This was a nice project.

I have a lot of these wirsbo in my home. I hope this will work well

[Denke]

I hope so to.

At the moment i struggling with the best way to present this sensor to my openhab and also what is the best way to set it up.

Parameters in
-remote requested temp //temp requested by the home automation system/user (mandatory)
-hysteresis low, hysteresis high //where to open and close from requested temp point (Setting for the Tech user) 0.5 will be default
-Update time //how often shall i regulate/change and measure (Setting for tech user) 1min will be default

Parameters out
-Temperature
-valve state
-Info field:
--Direct requested temp (knob reading)
--Remote requested temp (See above)
--Running mode internal/external (fall back if no communication is reaching the thermostat, but thermostat info is visible in system)
--hysteresis set in thermostat
--Update time

Anyone got any thoughts on what is the best way to present this.

[bjornhallberg]

Fantastic project! I also have a ton of these Wirsbo thermostats (from circa 1999) at home. Some of them have failed and have been bypassed. Remarkably expensive to replace and remarkably dull design wise. I always wanted to build something like this, possibly with the addition of a small oled display and a 3d printed or cnc machined (wood) enclosure.

[Denke]

New boards ordered. Took the oportunity to add an extra connector for SPI. So this in combination with the SDA/SCA will make it possible to add an OLED.

[Denke]

Finally my new boards have arrived, made some mistakes on the first one.

[clio75]

Hi,
Nice project. I have started similar "upgrade".
But my plan is to have separate temp/humidity sensors that reports to the VERA.
And then have a separate controller that open/close the valves/attenuators.
Now I have some sensors connected. My next step is to create one arduino/MySensor PID controller.
This should get actual temp and setpoint from VERA.

For a fallback I have some Ideas.

• Use some Pre Programmed settings.
• Last PID settings
• Get information directly from each sensor. (setup from VERA)

Looking forward to follow your project :)

[Denke]

Now the code is tested against openhab2.0 after some work adding HVAC in the binding. Will make a pull request for the binding part soon

[Denke]

2 boards completely assembled and working as expected. 3 more to go after ordering the missing components. Now some last fixes to the code so that memory can be wiped by pressing a button and also the check if connected to the home automation system if not a fallback should be initiated

[bjornhallberg]

@Denke Any updates to this project? Did you deploy the sensors? Any issues or has it been smooth sailing for the last couple of years?

[Denke]

@bjornhallberg The sensors are working fine and have been installed in my home for the last couple of years. Some optimisation needs to be done to the code, that i have not done. This is more connected to understanding when the mysensors network is in "range" as i want to fallback on the manual knob if the mysensor network is inactive for some reason or if i sell the house and the controller goes with me.