3 way valve

[danimaciasperea]

Hi Paul,

Nice work here adapting EMS Bus code to ESP.

I have seen that you are looking for a way to control the 3-way valve to switch the domestic hot water on and off. Maybe you can try using UBAFunktionstest datagrams (0X1D) and perform in the ColdShot method a test mode setting the valve to heating circuit (0x00) during some minutes.

In my house I also have "problems" with people taking too long showers...

Regards,

Daniel

[proddy]

Thanks Daniel. I was thinking of using the 0x1D too but it's experimental and worried that I'd mess it up. But worth a try I guess. Did you get my code working?

…

On Mon, 28 May 2018 at 12:20 Daniel Macías ***@***.***> wrote: Hi Paul, Nice work here adapting EMS Bus code to ESP. I have seen that you are looking for a way to control the 3-way valve to switch the domestic hot water on and off. Maybe you can try using UBAFunktionstest <https://emswiki.thefischer.net/doku.php?id=wiki:ems:telegramme#ubafunktionstest_write_only> datagrams (0X1D) and perform in the ColdShot method a test mode setting the valve to heating circuit (0x00) during some minutes. In my house I also have "problems" with people taking too long showers... — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABLHeKEZsnJiFI7nxYA3ADTAiGaGCvH3ks5t28-IgaJpZM4UP-iZ> .

[danimaciasperea]

No, I was just having a look. I am still using Arduino Mega and a Wifly RN-XV module. In the last weeks I have developed and documented a library for Arduino to talk with the EMS Bus.
I would like to learn more about ESP modules this summer, so maybe I will have try.

[proddy]

ah you built Calduino! I actually used some of your ideas too in my code design

[danimaciasperea]

Yeah, I already saw that ;)

[proddy]

My plan is to find a Nefit Easy thermostat (that supports the shower-timer) or a user with one and then sniff the traffic to determine which commands it is issuing to the boiler and reverse engineer into it my code.

[proddy]

@danimaciasperea - I got my hands on an Easy and we were both right. They use the UBAFunktionstest datagrams (0X1D) to switch off the 3-way valve to temporary stop the hot tap water. I've adopted the same approach. Just wanted to let you know!