Developer Builds Privacy-First Alarm Dashboard in Home Assistant Using KNX and Tecnoalarm

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A home automation enthusiast has detailed how they integrated a Tecnoalarm KNX keypad with Home Assistant to create a functional alarm dashboard. The build uses just two input_boolean helpers as a shared source of truth, keeping the physical keypad and the smart-home interface in sync via the KNX bus. To avoid exposing a real floor plan, the developer deliberately anonymised all sensor names and room layouts before publishing any details. Simulated binary sensors were used throughout development, allowing every dashboard state to be tested from a couch before any real door or window contacts were installed. The status display itself relies on a native Home Assistant markdown card with Jinja templating, requiring no third-party integrations to monitor 12 door and window sensors across two floors.

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