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Arduino HC-SR04 Distance Sensor Driver Implementation

HC-SR04 Ultrasonic Sensor and Arduino

The HC-SR04 Ultrasonic Sensor is a very affordable proximity/distance sensor that has been used mainly for object avoidance in various Arduino robotics projects.  It provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit.

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