HC-SR04 Ultrasonic Distance Sensor Module

Add reliable, non-contact distance sensing to your project with the HC-SR04 Ultrasonic Distance Sensor Module, one of the most widely used ranging sensors in the maker community. It measures distance by emitting a burst of 40kHz ultrasonic pulses and timing how long the echo takes to return, delivering accurate readings from 2cm out to 400cm without ever touching the target object.

Unlike infrared sensors, its performance isn’t affected by ambient light or the color of the object being detected, making it a dependable choice for obstacle avoidance robots, parking sensors, liquid level indicators, and automatic hand-wash dispensers. The module features a simple 4-pin interface, Trigger and Echo alongside power and ground, so a microcontroller only needs to send a short 10-microsecond pulse to start a measurement and then read the returning echo pulse width to calculate distance.

With low current draw and a straightforward 5V logic interface, this sensor works seamlessly with Arduino, ESP32, ESP8266, and Raspberry Pi projects, and is backed by extensive library support and countless tutorials, making it an excellent starting point for beginners exploring distance sensing and robotics.

Specifications :

• Measuring Range : 2cm to 400cm
• Accuracy : ±3mm
• Operating Voltage : 5V DC
• Quiescent Current : Less than 2mA
• Measuring Angle : Less than 15°
• Ultrasonic Frequency : 40kHz
• Trigger Pulse Width : 10µs (TTL level)
• Interface : 4-pin (VCC, Trig, Echo, GND)