Description: Adopts IO port trigger for at least 10us high level signal. It can send eight 40khz square wave automatically, and detect if there is any signal returned. If the signal returning, output one high level signal via IO port. The duration of the high level signal is the time from sending ultrasonic to returning. Measuring distance=duration of high level x sound velocity(340m/s)/2 Power supply :5V DC; Quiescent current :
