Sain Store Ultrasonic Module Hc-sr04 Distance Sensor For Arduino

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√óvelocity of sound (340M/S) /2) Power supply: 5V DC, quiescent current.