HC-SR04 Ultrasonic Distance Sensor Module

The HC-SR04 Ultrasonic Sensor Module delivers accurate non-contact distance measurement by transmitting high-frequency ultrasonic sound waves and calculating the echo reflection time. Equipped with dedicated transmitter and receiver transducers, it provides reliable proximity detection for microcontroller systems.

Ideal for obstacle avoidance robots, parking assist systems, and water level measurement, this compact module operates on a low-power 5V supply. It offers a practical detection range from 2 cm to 80 cm with a measuring angle under 15 degrees and high accuracy.

Key Features

Highlights

• High-precision non-contact distance measurement with 3 mm accuracy
• Low operating current of under 15 mA at +5V
• Practical detection range from 2 cm up to 80 cm with theoretical range up to 4 m
• Simple interface with standard Trigger and Echo digital pins
• Wide range of applications including obstacle avoidance, liquid level sensing, and robotics

Compatibility

Compatible with standard microcontrollers and development boards operating with 5V logic or 5V-tolerant GPIO pins, including Arduino, ESP32, ESP8266, and Raspberry Pi (with logic level shifting if required).

How to use

Product Description

This module is powered by 5V supply. To start the measurement the trigger pin has to be made high for 10usec and then turned off. This will make the transmitter to send an Ultrasonic wave of frequency 40HZ. Echo pin goes high for a period of time which will be equal to the time taken for the Ultrasonic wave to return back to the sensor.

The amount of time the Echo pin remains high is measured by the controller and the distance traveled by the wave is calculated by multiplying with the speed of sound and hence the distance of the object from the sensor is measured by halving the distance traveled by the wave.

What's included

Package Includes:

1 x Ultrasonic Sensor Module - HC-SR04

Downloads

• HC-SR04 Ultrasonic Sensor Datasheet