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2pcs Ultrasonic Module Distance Sensor with 2pcs Mounting Bracket for Arduino Uno R3 Mega 2560 Nano Raspberry Pi Smart Robotics Projects - XiaoR Geek, XR-U0012 XiaoR Geek XR-U0012 UPC   786738589153 Ultrasonic Sensor Distance Module:using IO trigger for at least 10us high level signal. 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. Power Supply:5V DC.Quiescent Current:

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