Combined optical flow and laser distance module featuring PMW3901 optical flow sensor and VL53l0X time of flight distance sensor. Designed for four axis aircraft and small robots, this compact module provides fixed point optical tracking plus short range laser ranging for improved position control and obstacle awareness. This listing is the 2M range version. Key benefits Better position hold and stable hovering: optical flow sensing detects ground motion to maintain position when GPS is weak or unavailable. Accurate short range distance feedback: VL53l0X laser ranging provides fixed point distance measurement up to 2 meters for landing, altitude hold, and obstacle avoidance. Reduced drift and smoother control: combining motion tracking and range sensing helps flight controllers and robots correct drift and execute more repeatable maneuvers. Compact and lightweight: small module size minimizes added weight and space on small drones and mobile robots, simplifying integration. Main features and attributes Sensors included: PMW3901 optical flow sensor paired with VL53l0X time of flight laser distance sensor. Function: optical tracking for motion sensing plus fixed point laser ranging for distance measurement. Range option: 2 meter fixed point laser ranging (this version). Form factor: compact PCB module suitable for mounting on four axis aircraft, multirotors, and small robotic platforms. Materials and build: standard PCB assembly with integrated optical and laser sensor components for reliable ondevice sensing. Performance focus: real time motion flow detection together with short range distance measurements to support position hold, hovering, and closerange navigation tasks. Compatibility and integration Intended for integration in four axis aircraft, small drones, indoor UAVs, and mobile robots that need complementary flow and range sensing. Suitable for use with common flight control and robotics setups where compact optical flow and short range distance data are required. Mounting and wiring: module mounts to a vehicle or chassis and connects to the control system for real time sensor input. Check your controller documentation for specific wiring and interface requirements. Practical use scenarios Indoor drone hover and position hold: use optical flow to detect horizontal motion over surfaces while the distance sensor provides altitude feedback during low altitude operations and landings. Precision landing assist: the laser ranging sensor measures the distance to the landing surface up to 2 meters to help slow and stabilize descent for safer landings. Closerange obstacle detection and navigation for small robots: combine optical flow for odometry correction with short range distance readings to detect nearby obstacles and maintain stable motion over uneven terrain. Why choose this module Combines two complementary sensing methods in one compact assembly so you get both motion tracking and distance feedback without adding multiple separate modules. Targeted for four axis aircraft and small robotic platforms where space and weight are limited and reliable short range sensing is required. Straightforward solution for improving indoor navigation, hover stability, and landing accuracy. Notes This listing is for the 2 meter laser ranging version. Verify your flight controller or robot controller supports the required interfaces and mounting approach before installation.