Presence and light radar sensor OXT T155 — USB power, Wi‑Fi (Tuya) for smart home integration

OXT T155 is a compact presence and light radar sensor designed for smart home and building automation. Powered via USB and connected over Wi‑Fi using the Tuya platform, the device combines passive presence detection with ambient light measurement to enable automated control of lighting, HVAC and security systems. Its small form factor and low-voltage USB power make it suitable for both retrofit and new installations where wireless integration and flexible placement are required.

Advantages

The sensor integrates presence detection and lux measurement in a single unit, reducing the need for separate motion and light sensors. USB power simplifies installation in locations without mains wiring while Wi‑Fi (Tuya) connectivity allows cloud-based control and local automation. Compact dimensions and a discreet design support unobtrusive mounting; sensitivity and detection algorithms are tuned for reliable detection of human presence while minimizing false triggers from pets or environmental changes.

Suitable for

• Automated indoor lighting control in residential rooms, corridors and utility areas
• Occupancy-based HVAC control to improve energy efficiency in apartments and offices
• Integration into Tuya-compatible smart home platforms and scenes
• Retrofit installations where low-voltage USB power is preferred over mains wiring

Key specifications

• Detection type: radar-based presence detection combined with ambient light sensing
• Power: USB-powered (low-voltage supply via USB cable)
• Connectivity: Wi‑Fi compatible with Tuya platform for cloud and local control
• Mounting: compact form factor for wall or ceiling placement in indoor environments
• Output: presence status and lux measurement suitable for automation triggers

How to use

Connect the sensor to a USB power source and follow the Tuya-compatible app workflow to add the device to your Wi‑Fi network. Place the sensor where it has an unobstructed view of the monitored area, avoiding direct exposure to strong light sources that could affect lux readings. Configure presence sensitivity and light thresholds in the app or automation platform to match room size and typical occupancy patterns. Use presence and lux outputs to trigger lights, HVAC setpoints or alarm conditions within the smart home platform.

Usage recommendations

For reliable occupancy detection, mount the sensor at a recommended height and orientation that covers the main activity zone; test and adjust sensitivity settings to reduce false positives. When controlling lighting, combine presence detection with ambient light thresholds to prevent unnecessary switching in well-lit conditions. Ensure the USB power source provides stable output and place the sensor away from large reflective surfaces for accurate lux measurement.