Description: Ranging reverse, 1, an analysis of the working principle of ultrasonic sensors, the working characteristics and blind spot detection 2, on the reverse range finder called for the former, left and right angle of 30 degrees on both sides of the framework of measurement 3, distance requirements less than 20m, less than 1.5 meters began to report to the police, less than 1 m further alarm to remind 4, the completion of Ranging System reversing circuit design, drawing and circuit diagram, the preparation software program.
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