HC-SR04 Range Detector Model Distance Sensor 10pcs(Blue)

HC-SR04 Range Detector Model Distance Sensor 10pcs(Blue)Providing 2cm to 400cm of non-contact measurement- Stable performance, accurate measurement range.Features:1.The ranging accuracy can reach to 3mm.2.The modules includes ultrasonic transmitters, receiver and control circuit.3.The basic principle of work: the Module automatically sends eight 40 kHz and detect whether there is a pulse signal back.4.IF the signal back, through high level , time of high output IO duration is the time from sending ultrasonic to returning.5.Distance = ((Duration of high level)*(Sonic :340m/s))/2. Specifications:Power supply :5V DCQuiescent current : <2mAEffectual angle: <15°Ranging distance : 2cm â€?500 cmResolution : 0.3 cmThere are 4 pins out of the module : VCC , Trig, Echo, GND.So it's a very easy interface for controller to use it ranging.The all process is :Pull the Trig pin to high level for more than 10us impulseThe module start rangingFinish rangingIf you find an object in frontEcho pin w