Optical flow sensor module for APM2.5 flight controllers using ADNS 3080 sensor Key benefits Improves position hold accuracy for multicopters, especially at low altitude and indoors where GPS is limited. Provides reliable relative motion measurements to reduce hover drift and stabilize yaw and lateral movement. Compact and lightweight design minimizes impact on payload and flight performance. What this module does Uses the ADNS 3080 optical sensor to detect ground motion and calculate velocity and displacement. Feeds motion data to compatible flight controllers to improve autonomous position hold, altitude control, and waypoint precision. Works as a complementary sensor to GPS and inertial units, providing better stability in GPSdenied or lowsignal environments. Compatibility and integration Designed for use with APM2.5 flight controllers and other autopilots that accept optical flow inputs. Connects to the flight controller using standard sensor interfaces; requires supported firmware and calibration for results. Suitable for integration into custom builds and retrofit installations on a wide range of multirotor platforms. Key features and attributes Sensor model: ADNS 3080 optical flow chip for accurate frametoframe motion detection. Function: realtime optical flow output for improved position hold and motion estimation. Construction: compact printed circuit board with onboard optics and electronics engineered for airborne use. Size and weight: small form factor and low mass to suit lightweight multirotor setups. Power and performance: designed for low power consumption and continuous operation during flight. How it solves common problems Reduces drift when hovering in environments with poor GPS reception. Improves stability during precision maneuvers such as inspections, photography, and landing approaches. Provides consistent shortrange motion sensing where barometers and GPS alone do not deliver sufficient accuracy. Practical use scenarios Indoor inspection flights where GPS is unreliable: maintain steady hover and precise lateral control while inspecting structures or confined spaces. Aerial photography and videography at low altitude: reduce unwanted movement to capture smoother footage and more accurate framing. Precision landing and takeoff near obstacles: combine optical flow data with existing sensors to achieve tighter control over touchdown location. Installation and setup notes Mount the sensor facing the ground with a stable, vibrationminimizing bracket and ensure a clear surface texture beneath for reliable tracking. Confirm flight controller firmware supports optical flow input and follow calibration procedures to align sensor output with the control system. Verify operating height and surface conditions during testing, as very altitude or featureless surfaces may reduce optical tracking performance. This optical flow sensor module offers a practical way to enhance multicopter stability and position control by leveraging the proven ADNS 3080 optical sensor and integration with APM2.5 compatible flight controllers.