The HAUI 3Gang Touch Display is a smart home control dashboard for wall mounting, tailored to run Home Assistant, OpenHAB, Domoticz, and other web-based home automation dashboards.
It utilizes a Raspberry Pi 3B+ as its core, chosen for its affordability after the Pi 4/5 price increases. The HAUI (Home Assistant User Interface) replaces traditional wall switches, fitting into a single-gang electrical box while its front panel covers a three-gang space, hence the “3Gang” name. It operates on a customized FullpageOS Linux distribution with a Chromium browser in kiosk mode, offering built-in MQTT integration and SSH access for advanced configurations.
HAUI Touch Display specifications
- Main Controller – Raspberry Pi 3B+
- Display – 7-inch capacitive touchscreen
- Connectivity – Wi-Fi on Raspberry Pi (configured via initial setup wizard)
- Power
- Input Voltage – 120 VAC ±10%
- Maximum Current – 1 A
- Internal USB charger module (Line/Neutral wiring, no ground required)
- Dimensions – TBD (minimal bezels designed to cover a 3-gang switch footprint)
- Temperature – Up to 35°C (95°F) ambient maximum
- Enclosure – Custom 3D-printed design with no screws, no visible gaps
The HAUI boots directly into a dedicated Setup Wizard at first use, where users can configure Wi-Fi, assign a Hostname, set up MQTT, and designate the target dashboard URL. It supports MQTT to manage backlight brightness, dimming timeouts, and sleep, reporting hardware diagnostics to the dashboard. Without MQTT, it defaults to settings that conserve power and prevent screen burn-in.
Users can access the device at http://[IP_ADDRESS]/controls/ to adjust settings or clear the Chromium cache if needed. SSH access is enabled with “haui” as both username and password. Once logged in, users can execute Linux commands to view network and system logs. Backlight and sleep settings are managed by a dedicated service, with helper scripts available in /home/haui/scripts, although modified systems aren’t officially supported. More info is in the user manual and community forums.