Front view of ShillehTek HC-SR04 Ultrasonic Distance Sensor Module with two circular transducers

HC-SR04 Ultrasonic Distance Sensor Module 4-Pin for Arduino & Raspberry Pi

Name: HC-SR04 Ultrasonic Distance Sensor Module 4-Pin for Arduino & Raspberry Pi
Brand: ShillehTek
Price: 4.49 USD
Availability: InStock

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HC-SR04 ultrasonic sensor for Arduino delivers a 2-400 cm detection range and 3mm accuracy, offering reliable echo-based distance measurements for precision sensing applications.

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Overview

Product Overview

HC-SR04 Ultrasonic Distance Sensor is a compact 4-pin module that gives robots and projects the ability to "see" with sound. It uses echolocation, emitting high-frequency pulses and timing echoes to calculate distance, making it a reliable, low-cost option for Arduino and Raspberry Pi builds. It measures from 2cm to 400cm (about 13 feet) and performs well in darkness or bright sunlight where IR sensors often fail, including on glass, mirrors, and dark surfaces. With separate Trigger (input) and Echo (output) pins for clear signal management and good repeatability—accuracy can be as fine as 3mm—it’s straightforward to integrate and is compatible with common libraries like NewPing for advanced control and filtering.

Questions & answers

Frequently asked questions

Does the HC-SR04 work with Arduino and Raspberry Pi?

Yes. This 4-pin ultrasonic module is designed for Arduino and Raspberry Pi builds and works with common HC-SR04 libraries, including NewPing on Arduino. Raspberry Pi projects should handle the Echo signal safely for the Pi’s GPIO.

Is the HC-SR04 ready to connect to a breadboard?

Yes. ShillehTek modules are supplied with headers already soldered, so you can connect jumper wires directly to VCC, Trig, Echo, and GND. You still need to wire it correctly and add code to trigger and read echoes.

What pins and signals does the HC-SR04 use?

The module has four pins: VCC, Trigger input, Echo output, and GND. Your controller sends a trigger pulse, then measures the Echo pulse duration to calculate distance using ultrasonic time-of-flight.

Can the HC-SR04 detect objects in sunlight or darkness?

Yes. It uses sound instead of light, so it can work in darkness or bright sunlight where many IR distance sensors struggle. It is useful for robot obstacle detection, parking aids, tank level sensing, and proximity projects.

Why are my HC-SR04 readings unreliable?

Check that the target is within the 2 cm to 400 cm measuring range and is positioned to reflect sound back toward the sensor. Loose wiring, incorrect trigger/echo code, and unsafe Raspberry Pi GPIO interfacing can also cause bad readings.

Have other questions?

Chat with our US-based team — we usually reply fast.

What's included