The HAUI 3Gang Touch Display is a wall-mount smart home control dashboard designed specifically to run Home Assistant, OpenHAB, Domoticz, or any other web-based home automation dashboard.
Built around a Raspberry Pi 3B+ since it’s one of the cheapest options following Pi 4/5 price hikes, the HAUI (Home Assistant User Interface) replaces standard wall switches and fits into a standard single-gang electrical box, while its front panel spans roughly a three-gang footprint, hence the “3Gang” name. It runs a customized version of FullpageOS Linux distribution with a Chromium browser in kiosk mode and includes built-in MQTT integration along with SSH access for advanced users.
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
Unlike a generic tablet, the HAUI boots directly into a dedicated Setup Wizard upon first power-up. Users are prompted to configure their Wi-Fi, assign a Hostname, set up an MQTT broker connection, and define the target dashboard URL. The device supports MQTT, which allows Home Assistant to control backlight brightness, dimming timeouts, and sleep behavior, while also reporting hardware diagnostics, such as undervoltage events, directly to the dashboard. If MQTT is not used, the system falls back to default settings for dimming and screen sleep to reduce power consumption and prevent burn-in.
Users can access the device’s web interface at http://[IP_ADDRESS]/controls/ to adjust settings or clear the Chromium cache if it gets stuck on the boot logo, and local SSH access is enabled by default with the username and password both set to “haui”. Once logged in via SSH, users can run standard Linux commands to check network status and monitor system logs. Backlight and sleep behavior are handled by a dedicated service, and helper scripts are available in the system directory (/home/haui/scripts), although modified systems are not covered by official support. More information about the device can be found in the online user manual and on the Home Assistant community forums.
Top right – Internal hardware view with Raspberry Pi 3B+ and DSI ribbon cable connected to the 7-inch display.
Bottom left – Cross-section view highlighting the snap-fit, flush-mount bezel mechanism.
Bottom right – Step-by-step view of the wall bracket and how the display snaps into place.
To install the device, remove the existing light switch, connect the USB power module to Line and Neutral, place it in the electrical box, and attach the display via USB before securing it to the wall bracket.
The main competitor to the HAUI Touch Display is the SONOFF NSPanel Pro (including the Gen2 version), an all-in-one Android-based Zigbee panel with a smaller 3.95-inch display for European boxes, whereas the HAUI targets North American 3-gang installs with a larger 7-inch screen (and 120V AC input). Alternatively, we have ESP32-P4-based systems like the 7-inch Elecrow CrowPanel Advance, but that requires you to build your own enclosure, write custom ESPHome/LVGL firmware, and source your own power supply.
The HAUI 3Gang 7-inch wall-mount Home Assistant dashboard is available for $199 on Tindie. It ships with a 120 VAC USB power module, which means it’s primarily designed for the US market, but you might be able to replace it with a similarly-sized 240V unit to use it in other regions.
Debashis Das is a technical content writer and embedded engineer with over five years of experience in the industry. With expertise in Embedded C, PCB Design, and SEO optimization, he effectively blends difficult technical topics with clear communication
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