This is my project of hardware and software development to replace an old alarm system keeping all the contact sensors and integrate it in Home Assistant.
The hardware is based on an ESP32 that collect old sensors data and send them to Home Assistant.
This device doesn't need any configuration on Home Assistant, the system uses MQTT Discovery on ESP32 to autoconfigure itself.
More on Home Assistant MQTT Discovery on
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Sources on
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![](https://i.ytimg.com/vi/yXYOYkuCAfA/maxresdefault.jpg)