HC-SR04 Ultrasonic Distance Measuring Sonar Sensor

This ultrasonic sensor module can be used for measuring distance, object sensor, motion sensors etc. High-sensitive modules can be used with microcontrollers to integrate with motion circuits to make robotic projects and other distance, position & motion sensitive products.The module sends eight 40Khz square wave pulses and automatically detects whether it receives the returning signal. If there is a signal returning,  a high level pulse is sent on the echo pin. The length of this pulse is the time it took the signal from first triggering to the return echo.

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