AppDaemon 4.5.14 is a Python runtime that runs next to Home Assistant . It lets you write rules as full Python classes. You get state machines, scheduling, outside API calls, and logic that YAML can’t handle. Install it as a Home Assistant add-on, drop a Python file in the apps folder, define a class that inherits from hass.Hass, and use callbacks like listen_state() and run_daily() to drive multi-step flows, saved values, and live data.

Yes, you can watch and control your 3D printer from anywhere. Just connect OctoPrint or Moonraker to Home Assistant . Both print servers expose APIs that Home Assistant can poll for live data: print progress, temperatures, camera feeds, and error states. From there you can build dashboards, fire phone alerts when a print ends, spot failures with AI camera checks, and cut power to a runaway printer through a smart plug. Setup takes about an hour once your print server runs on a Raspberry Pi. The result: a 3D printer that acts like any other smart device.

That old Android phone in your drawer is a full sensor platform. It packs a camera, microphone, light sensor, barometer, accelerometer, proximity sensor, and a touchscreen, all on your WiFi. So don’t recycle it. You can turn it into a motion-detecting security camera, a room sensor that posts data over MQTT, or a wall-mounted Home Assistant dashboard. That dashboard rivals commercial smart displays costing $150 or more. The whole setup runs on free software, keeps your data local, and takes about an hour.

Mount an ESP32-C3 Super Mini with a reed switch on the mailbox door (or a VL53L0X time-of-flight distance sensor inside the box), flash it with ESPHome 2026.3, and wire it into Home Assistant - you will get instant push notifications on your phone the moment mail lands. The total parts cost sits under $15, and deep sleep keeps the whole thing alive for months on a single 18650 cell.

You can build a fully local, cloud-free home alarm system with Z-Wave door and window sensors, motion detectors, and a siren wired to Home Assistant through a Z-Wave JS controller. The built-in alarm_control_panel integration plus a few automations handle arming, disarming, entry delays, and the siren. It all runs on your local network. No cloud subscription, no monthly fee, and the alarm keeps working even when your internet goes down.

You can stream live vehicle diagnostics and GPS location to Home Assistant by pairing a Bluetooth Low Energy OBD-II adapter with an ESPHome -based BLE proxy or a dedicated Android device running Torque Pro . This setup feeds real-time fuel economy, engine codes, coolant temperature, and GPS coordinates into Home Assistant entities, enabling geo-fenced automations like opening your garage door on arrival or logging trip fuel costs - all without any cloud dependency.