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Unmanned aerial vehicles including drones are attracting attention in recent years. A drone is required to approach an object and obstacles when the drone uses for inspection and an indoor space. However, the collision risk is increased when the drone is close to the object. In this paper, we propose the omni-directional proximity sensor for a drone to avoid a collision. The sensor system consists of 30 units of time-of-flight (ToF) sensors that are able to detect the distance between the sensors and objects. The sensor system attaches the propeller guard and the drone, and detects the object at non-contact area. Thus, this sensor system can avoid unnecessary contact between the drone and objects. Therefore, the sensor system may be useful for drones.

proximity sensor, drone, collision avoidance.