HC-SR04-Ultrasonic Range Finder is a very popular sensor which is found in many applications where it requires to measure distance and detect the objects.
The module has two eyes like projects in the front which forms the Ultrasonic transmitter and Receiver. The HC-SR04 ultrasonic sensor uses sonar to determine the distance to an object like bats or dolphins do.
Wiring:
5V(positive)
Trig(control)
Echo(receive)
GND(negative)
Features :
1. Measures the distance within a wide range of 2cm to 400cm
2. Stable performance
3. Accurate distance measurement
4. High-density
5. Small blind distance