MATEKSYS Optical Flow & Lidar Sensor 3901-L0X

The MatekSys 3901-L0X integrates a PMW3901 optical flow sensor and a VL53L0X Time-of-Flight (ToF) lidar into a single 2g module. Designed for INAV and ArduPilot builds, it enables precise low-altitude position hold and terrain following without relying on GPS, making it highly effective for indoor flights or dense environments where satellite locks are unavailable.

Key features

• Combines PMW3901 optical flow and VL53L0X lidar rangefinder on a unified board

• Outputs data via MultiWii Serial Protocol (MSP) over a single UART, eliminating complex I2C/SPI wiring

• Provides reliable altitude sensing up to 2 metres and position hold over textured surfaces

• Compact 36x12mm footprint easily mounts to micro and mid-sized drones

Specifications

• Sensors: PMW3901 (Optical Flow), VL53L0X (Lidar)

• Protocol: MSP (UART TX/RX)

• Lidar Range: Up to 2m

• Minimum Operating Height: 8cm

• Input Voltage: 4.5–5.5V

• Current Draw: 40mA

• Dimensions: 36x12mm

• Weight: 2g

• Supported Firmware: INAV, ArduPilot

For reliable optical flow tracking, ensure the sensor lens has an unobstructed view of a well-lit, textured ground surface. The module requires a minimum flying height of 8cm to accurately register movement.