CJRSLRB 5 Pcs 5 Pack Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot
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The Module automatically sends eight 40 kHz and detect whether there is a pulse signal back. If the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning. Test distance = (high level time velocity of sound (340M/S) /2
5 X CJRSLRB® Ultrasonic Module HC-SR04 Distance Sensor For Arduino
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