Holybro PMW3901 Optical Flow Sensor - UART Interface, 6-Pin JST GH Connector

The PMW3901 Optical Flow Sensor operates from 2.0V to 3.6V DC, powered by its integrated BEC (Battery Eliminator Circuit). This range makes it directly compatible with standard 3.3V logic flight controllers and robotic mainboards without requiring an external voltage regulator.

Connect the module's pre-soldered 6-pin JST GH connector directly to an available TELEM port on your flight controller. Ensure the UART serial port is configured for 19200 baud rate. The wiring typically follows standard telemetry pinouts: VCC, GND, TX, and RX for power and bidirectional data communication.

The sensor captures optical flow data at 95 frames per second (95 Hz). This high frame rate enables low-latency motion detection, which is critical for real-time velocity estimation and position hold in dynamic flight conditions. Higher FPS improves the accuracy and responsiveness of navigation algorithms in autonomous systems.

While optimized for aerial platforms, the PMW3901 is equally effective for ground-based robotics. It provides precise odometry and velocity data over textured surfaces, enabling autonomous navigation, slip detection, and dead reckoning for wheeled or tracked robots in environments where wheel encoders or GPS are insufficient.

For optimal performance, the sensor requires a textured surface with sufficient visual contrast. It operates best under consistent ambient lighting, though the PMW3901 chipset includes algorithms for low-light adaptation. Avoid perfectly uniform, reflective, or transparent surfaces, as they can degrade optical flow tracking accuracy.