Colin O’Dell has taken a Raspberry Pi Zero W, an Adafruit 3.5″ touchscreen, a PIR motion sensor and a 3D-printed enclosure and created a home alarm control panel. The system uses Z-Wave door sensors which send MQTT messages to the Pi via the Home Assistant open-source home automation platform. The PIR sensor is used to only activate the screen when someone is near – thus further reducing the power requirements. It’s an ingenious system and you can read more about it here and see a video below.