Alex Klimaj on Twitter: "ARK Flow is available for pre-order! It is a UAVCAN node that runs @PX4Autopilot on a 3cm x 3cm PCB that includes an optical flow sensor, 30m distance
Amazon.com: Optical Flow Sensor, Yuenhoang FPV RC Drone Optical Flow Module Hovering Altitude Hold Optical Flow Sensor Balance Visual Position Board for Racing Quadcopter Multicopter Flight Control (1 Pc) : Toys &