Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor

1.the Module includes ultrasonic transmitter and receiver and control circuit.

2.Range: 2cm-400cm;

3.Accuracy:2mm;

4.IO port TRIG to trigger ranging. 10us high level signal at least.

5.Send 8 pro 40KHz square wave automatically , then will test if any signal returned.

6.If signal returned, output one high level signal via IO port ECHO, the duration of the high level signal is the time from transmitter to receiving with the ultrasonic. Test distance=duration of high level * voice velocity(340m/s)/2

7.VCC supply 5V and GND is ground wire. TRIG is trigger control signal input, ECHO is echo signal output.