ITEM NAME:5 X Sound Ultrasonic Range Distance Sensor Module HC-SR04 Sensor For Ard QXZ.5 Pcs Ultrasonic Module HC-SR04 Sensor. use IO port TRIG to trigger ranging. It needs 10 us high level signal at least. Mode of connection:VCC, trig(T), echo(R), GND. Sensor angle: Not more than 15 degrees.
