What is Doorman? ā
Doorman allows you to connect your TCS TC:BUS, Koch TC:BUS or SIEDLE IN-HOME-BUS intercom to any home automation system. Additionally, some rebranded Niko, Scantron and older Jung intercoms are counterparts to the TCS and Koch models.
What about other intercoms? ā
Doorman isn't limited to TC:BUS and IN-HOME-BUS intercoms.
You can use it to simulate a button press to trigger a door opener or light with the integrated solid-state relay (up to 40V, max 2.5A).
If your intercom operates on a 2-wire bus within the 14-30V DC range, it might be possible to implement other protocols as well. You can also monitor the voltage level on older intercoms (14-30V DC) using the internal ADC and trigger specific actions based on the readings.

Just received your Doorman? Jump to the Quickstart guide.
Features ā
- Powered by ESP32-S3
- USB-C port for easy flashing (and because USB-C is cool š)
- Compact design that fits almost anywhere
- WS2812B/SK6812B RGB LED to indicate specific events
- Two additional GPIOs for easy expansion with your own sensors and devices (e.g., I²C, external button)
- Solid-state relay for switching up to 40V (max. 2.5A), ideal for older intercom systems
- Bridge rectifier for bus-wire input to correct polarity
- TC:BUS communication for functions like opening the front door and detecting the doorbell
- SIEDLE:IN-HOME-BUS communication for functions like opening the front door and detecting the doorbell
- Can be used as a Nuki Bridge with the Nuki Bridge Addon.
Interested in a Doorman? ā
If you'd like a fully assembled Doorman S3 unit, you can use the button below to submit a non-binding inquiry.
If you have any questions or prefer direct contact, you can also reach out on Discord or via email.