Trying to connect a siedle BTS 850-02 to homeassistant via Xiao ESP32C3

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Hi folks,
I’m researching on this topic for quite a while. Sadly, it took me a long time to stumble over this possible dealbreaker.

I assumed my doorphone was a much simpler HTA-811 but it is a BTS 850 which speaks siedle in home bus. There are a couple promising solutions for other siedle doorphones but I havent seen anything for this one so far.

Does anyone happen to know how to interact with the two bus pins ta and tb? I would like to use my xiao esp32c3 with wifi and BLE to connect it to homeassistant, possible over esphome or if possible even with a sip client. That would be a later step though.

I havent found anything about the siedle in home bus. What protocol they use, if it is encrypted or anything. I guess there would be a solution to manually read from the light that signals a bell ring and send to the door buzzer button if all else fails.

But of course hacking the in home bus would be pretty cool.

I made this git repo to collect information and cooperate with people. You can use gitlab or github logins if you want to participate: Smart_Doorbell/README.md at main - haui/Smart_Doorbell - Forgejo: Beyond coding. We forge.

Any ideas?

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That’s funny, I did the same mistake as you.

I thought I had a HTA 711 but it turned out to be a BTS 750 02 which uses the same Siedle in house bus with the ta tb and ERT pins.

I’m also looking for a solution.

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I have a BTS 850. Please let me know, when you found a solution to interact with the bus :slight_smile:

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I would also be interested but I guess there is a reason that they don’t publish any documentation about their protocol - they don’t want others to interface with their closed ecosystem.

Maybe the smart gateway SG 150 is a solution:
https://www.siedle.de/de-de/produkte/sg-150-0-smart-gateway/

But, again, I couldn’t find any information on what it offers on its LAN port.

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Also looking for a solution…

and found two interesting topics:

Siedle In-Home-Bus Protokoll - Mikrocontroller.net (in German)
this leads to
GitHub - mbs38/siedle-in-home-bus-avr: Atmel AVR compatible library implementing an interface to the Siedle "in-home-bus", which Siedle uses in many of their door intercom systems. Example circuits necessary for the physical interface included.

So no easy solution available, but if you are willing to do some DIY electronics it might be possible :slight_smile:

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For those looking for a solution with esphome: esphome/devices/pcb-siedle-bus at master · angelnu/esphome · GitHub

It is derived from the mikrocontroller thread - basically the same circuit but with a custom esphome component to implement the bus.

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