Soldering T3 and T4

[johanf85]

Hi Jan,

Recently I bumped into your project via a search on Github. I already own some Eqiva EQ3 N model TRVs and I would like to try to create the same like you did in this project. I like your design and the ability to use MQTT and the ESP8266 as choice of hardware.

Thanks for adding the thorough documentation and photos.

Today I looked at how to solder to the PCB of the eq3. From your photo it's a bit difficult to determine where to solder the T3 and T4. I don't want to make a short circuit. Do I only have to solder to one little pin for T3 and T4?

Here is a photo of my Eq3:

Thanks in advance,

Johan

[johanf85]

Hi Jan, I ran the text of the PDF poster trough Google Translate and noticed this project was part of your bachelor thesis.

Then I thought it might be published online and some online search led me to your thesis document: https://www.fit.vut.cz/study/thesis-file/23742/23742.pdf

There I found more information, once again translated, and this makes things more clear!

[Smejky338]

Hello Johan, I'm glad you found and used my project (: You have probably used this diagram, based on that you can use one wire with more solder to connect to both T3 and T4 (and another wire for T1+T2): https://github.com/Smejky338/Heating_ESP_control_with_WiFi_MQTT/blob/main/wiring/Wiring%20diagram%20for%20valve%20head.png Don't hesitate to ask me if you have any other questions Jan

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On Sat, 4 Sept 2021 at 09:55, johanf85 ***@***.***> wrote: Hi Jan, I ran the text of the PDF poster trough Google Translate and noticed this project was part of your bachelor thesis. Then I thought it might be published online and some online search led me to your thesis document: https://www.fit.vut.cz/study/thesis-file/23742/23742.pdf There I found more information, once again translated, and this makes things more clear! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEBCCZMCZ7SXBNHVB7YHRA3UAHGFZANCNFSM5DJ22HZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[johanf85]

Hi Jan,

Thanks for your answer. Yes by reading your (translated) thesis, I noticed that one wire connects to multiple resistors. I am planning to execute the project coming week, if I find the time.

How did you determine what connections had to be made to influence the behaviour of the Eq3 radiator valve?

Regards,
Johan

[Smejky338]

Hi, I knew that the motor will probably be controlled by an H bridge ( https://en.wikipedia.org/wiki/H-bridge). When I opened the valvehead, I realised that the 4 transistors will likely be controlling the motor in H bridge configuration. After that I just hooked up multimeter prongs. One to GND or +, the other to the middle (controlling) pin of the transistors one by one, while making the motor move by putting the valvehead into insert mode. Good luck with your project! Jan

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On Sun, 5 Sept 2021 at 19:33, johanf85 ***@***.***> wrote: Hi Jan, Thanks for your answer. Yes by reading your (translated) thesis, I noticed that one wire connects to multiple resistors. I am planning to execute the project coming week, if I find the time. How did you determine what connections had to be made to influence the behaviour of the Eq3 radiator valve? Regards, Johan — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEBCCZOXAMVUR5AWFNKICLDUAOSWXANCNFSM5DJ22HZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[johanf85]

Allright, I don't know anything about H Bridges, so that's something for me to learn more about.

I am quite into smart heating with Home Assistant, I wrote a document about my configuration: https://johanf85.github.io/home-assistant-heating-configuration/description.html

Regards,
Johan