HC-SR04 Ultrasonic Distance Sensor Module

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The ultrasonic sensor HC-SR04 uses sonar to determine the distance to an object. It offers excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package, from 2cm to 500 cm or 1” to 16 feet. Its function is not affected by sunlight or black material like Sharp range finders are (although acoustically soft materials like cloth can be difficult to detect).

The modules include ultrasonic transmitters, receiver and control circuit.

Module Working Principle:

1. Adopt the IO trigger by supplying at least a 10us sequence of high-level signals.

2. The module automatically sends eight 40khz square waves and automatically detect whether to receive the returning pulse signal.

3. If there are signals returning, through outputting a high level and the time of high level continuing is

the time of that from the ultrasonic transmitting to receiving. Test distance = (high-level time * sound velocity (340M/S) / 2.

Features of HC-SR04 Ultrasonic Distance Sensor Module:

  • Input Voltage: 5V
  • Working Current: 15mA
  • Standby current: less than 2mA
  • Working Frequency: 40KHz
  • Induction Angle: <15°
  • Distance Range: 2cm ~ 400cm
  • Resolution : 1cm
  • Trigger Input Pulse Width: 10uS
  • Pin Number: 4 Pin
  • Interface: TTL
  • Compatible with Arduino
  • Size: 45mm x 20mm x 15mm
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