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Ultrasonic Distance Sensor HC-SR04

5.0 (2)

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5.0 (2 reviews)

The HC-SR04 is a widely used ultrasonic distance sensor that measures distances from 2cm to 500cm (approximately 5 metres) with 1cm resolution. It works by e...

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The HC-SR04 is a widely used ultrasonic distance sensor that measures distances from 2cm to 500cm (approximately 5 metres) with 1cm resolution. It works by emitting a 40kHz ultrasonic pulse, then measuring the time it takes for the echo to return — making it ideal for obstacle detection, range finding, and proximity sensing.

Send a 10μs trigger pulse and the module emits eight 40kHz ultrasonic bursts, then outputs a pulse proportional to the measured distance. If no object is detected, the output pin goes high for 38ms. A minimum cycle period of 50ms is recommended between measurements for accurate readings.

Specifications

  • Power Supply: 5V DC
  • Idle Current: <2mA
  • Measurement Range: 2cm – 500cm
  • Resolution: 1cm
  • Effective Angle: <15°
  • Ultrasonic Frequency: 40kHz
  • Trigger Pulse: 10μs minimum
  • Recommended Cycle Period: ≥50ms

Key Features

  • Non-Contact Measurement – Ultrasonic ranging without physical contact
  • Simple Interface – Single trigger pin and echo output; works with any microcontroller
  • Wide Range – Detects objects from 2cm to 5 metres away
  • Low Power – Under 2mA idle current

Ideal For

  • Robot obstacle avoidance and navigation
  • Drone low-altitude sensing
  • Proximity detection and distance measurement projects
  • Arduino and Raspberry Pi sensor projects

Jargon buster

Plain-language definitions for the technical terms used above.

DC
DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
microcontroller
A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.

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All Products Arduino Sensors Circuitry & IOT More from Pi Australia New Arrivals Prototyping & Wiring

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Brands and Manufacturers Little Bird Electronics

Sensors & Input

Distance & Ranging Sensors Motion (PIR, ultrasonic) Proximity & Distance Sensors Sensors & Modules

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