Sonar Distance Sensor (HC-SR04)

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Sonar Distance Sensor (HC-SR04)

Ultrasonic sensors overcome many of the weaknesses of IR sensors – they provide distance measurement regardless of color and lighting of obstacles.
They also provide lower minimum distances and wider angles of detection to gaurantee that obstacles are not missed by a narrow sensor beam.

Measurement Procedure & Formula:
Distance measurements can be made with microcontrollers in a straightforward manner:
1. Send a 10 uS wide pulse to the sensor on the Trigger Pin. The sensor will automatically send out a 40 kHz wave.
2. Begin monitoring the output from the Echo Pin and
3. When the Echo Pin goes high, begin a timer.
4. When the Echo Pin goes low, record the elapsed time from the timer and use the following conversion formula:
Distance (in cm) = (elapsed time * sound velocity (340 m/s)) / 100 / 2
5. Note: we divide distance by 2 because the sensor returns the round trip time, which doubles the distance measurement.
6. Refer to the timing diagram

Package List:
1 x Sonar Distance Sensor

Category: Sensor & Module Tags: HC-SR04, Sonar Distance Sensor