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Ultrasonic Module HC-SR04 Distance Sensor / Measuring Transducer

100

The HC-SR04 ultrasonic ranging sensor. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit.

  • There are only four pins that you need to worry about on the HC-SR04: VCC (Power), Trig (Trigger), Echo (Receive), and GND (Ground).
  • This sensor can be used in any robot that needs to know the distances to objects in front of it.
  • It offers excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package. From 2cm to 400 cm or 1” to 13 feet.
  • It comes complete with ultrasonic transmitter and receiver module.

Pins

This module has 4 pins- Vcc (5V), Trig, Echo, GND. Trig (trigger) is used to send out an ultrasonic high level pulse for at least 10μs and the Echo pin then automatically detects the returning pulse.

Measuring Distance

The time it takes the sound wave to be sent, hit the object and return back to the sensor is measured. This time is then multiplied by the speed of sound (343m/sec = 0.0343cm/μs = [1/29.1] cm/μs approx.) to give the total distance traveled by the ultrasonic wave, which is then divided by 2 (to account for the fact that the wave was sent, hit the object, and then returned back to the sensor, hence covering twice the distance to the object)
Distance = (Time for wave to return * Speed of sound) / 2.

Features:

  • Power Supply :+5V DC

  • Quiescent Current : <2mA

  • Working Currnt: 15mA

  • Effectual Angle: <15°

  • Ranging Distance : 2cm – 400 cm/1" - 13ft

  • Resolution : 0.3 cm

  • Measuring Angle: 30 degree

  • Trigger Input Pulse width: 10uS

  • Dimension: 45mm x 20mm x 15mm

The HC-SR04 ultrasonic ranging sensor. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit.

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