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Sonar Distance Sensor (HC-SR04)

90.00 ৳ 

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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

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