The HY-SRF05 is an ultrasonic emitter and receiver that is used to measure distance with a precision of approximately 0.3cm. It emits a 40 KHz square wave signal which reflects off objects in front of the sensor. The sensor then reads the reflected signal, and the duration of the received signal is reflected on the ECHO pin.


  • Operating Principle: Ultrasonic distance measurement using sound waves.
  • Measurement Range: Typically ranges from 2 centimeters to 450 centimeters (2cm – 450cm), adjustable based on the application.
  • Ultrasonic Frequency: Typically operates at 40 kHz.
  • Accuracy: High accuracy with a resolution of 0.3 centimeters.
  • Interface: Connects to microcontrollers or development boards via digital I/O pins (typically Trigger and Echo).
  • Operating Voltage: 5V DC.
  • Trigger Pulse: Generates a short trigger pulse to initiate distance measurement.
  • Echo Signal: Receives the reflected ultrasonic pulse and provides an output signal.
  • Control Pins: Often includes pins for controlling the module, such as mode selection or power.
  • Operating Temperature: -20°C to +70°C.
  • Dimensions: 45mm x 20mm x 15mm


  • Accurate Distance Measurement: Provides highly accurate distance measurements with a high resolution.
  • Wide Measurement Range: Offers a versatile range from 2cm to 450cm, adjustable as needed.
  • Easy Integration: Interfaces easily with microcontrollers and development boards using digital pins.
  • Low Power Consumption: Consumes relatively low power during operation.
  • Compact Design: Compact and lightweight for easy integration into projects.
  • Usage Tip: Ensure that the trigger and echo pins of the sensor are connected correctly to your microcontroller or development board. Account for the speed of sound in your environment (approximately 343 meters per second at 20°C) when interpreting the time-of-flight measurement to calculate distance.
  • Caution: Handle the sensor with care to avoid damage to the transceiver element. Avoid exposing the sensor to extreme temperature or humidity conditions outside its specified operating range.



  • 1 x HY-SRF05 Ultrasonic Ranging Sensor
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