# Ritto 7630: reconstructing intercom bell and door signals

> ritto-esp investigates the Ritto 7630 TwinBus intercom's board signals with oscilloscope captures, distinguishing apartment and street bell events by their chime and apartment-line behavior. An ESP32-C6 running ESPHome exposes separate bell sensors and a door-open command to Home Assistant through optocoupled inputs and output.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/duramson/ritto-esp>
- Primary source: <https://github.com/duramson/ritto-esp/blob/872acd254e01392b97e006c011e05d289c60d3cd/README.md>
- Catalog page: <https://awesomerea.org/resources/ritto-esp-case/>
- Record JSON: <https://awesomerea.org/resources/ritto-esp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/ritto-esp-case/index.md)

## Requirements & limits

- **Prerequisites:** A Ritto 7630 intercom, Seeed XIAO ESP32-C6, optocouplers, resistors and USB-C power.
- **Prerequisites:** ESPHome and Home Assistant are used for the supplied configuration and automations.
- **License:** MIT licence.

## Primary sources

1. <https://github.com/duramson/ritto-esp/blob/872acd254e01392b97e006c011e05d289c60d3cd/README.md>
2. <https://github.com/duramson/ritto-esp/blob/872acd254e01392b97e006c011e05d289c60d3cd/home-assistant/README.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.