1.Provide TRIGGER signal, atleast 10μS High Level (5V) pulse.
2.The module will automatically transmit eight 40KHz ultrasonic burst.
3. If there is an obstacle in-front of the module, it will reflect the ultrasonic burst.
4.If the signal is back, ECHO output of the sensor will be in HIGH state (5V) for a duration of time taken for sending and receiving ultrasonic burst. Pulse width ranges from about 150μS to 25mS and if no obstacle is detected, the echo pulse width will be about 38ms.
5. VCC – 5V, +ive of the power supply
6.TRIG – Trigger Pin
7.ECHO – Echo Pin
8. GND – -ive of the power supply