Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	5V DC
Static Current	< 2mA
Measuring Angle	15 degrees
Measuring Range	2cm to 400cm
Resolution	0.3cm
Trigger Input Signal	10µS TTL pulse
Echo Output Signal	TTL level signal proportional to distance
Dimensions	45mm x 20mm x 15mm
Compatibility	Arduino, Raspberry Pi, STM32, ESP8266
Package Contents	1x HC-SR04 Ultrasonic Module

6 reviews

Anonymous

Mar 23, 2026

Rating: 5/5

Perfect for my robotics project

This sensor works flawlessly with my Arduino Uno. The range is accurate up to about 3 meters in my testing, which is plenty for my obstacle avoidance robot. Setup was easy using standard libraries.

Anonymous

Mar 22, 2026

Rating: 5/5

Easy to code for beginners

I am new to electronics and found tons of tutorials online for this specific model. It took me less than an hour to get it working and displaying distance on my serial monitor. Very beginner-friendly.

Anonymous

Mar 17, 2026

Rating: 4/5

Solid performance for altitude hold

Using this for low-altitude holding on a small DIY drone. It responds quickly enough for basic stabilization. Not suitable for high-speed applications, but great for learning and slow-moving projects.

Anonymous

Mar 16, 2026

Rating: 3/5

Works well but sensitive to angle

The sensor detects distance accurately when the object is perpendicular to the face. However, if the object is at a sharp angle, the sound waves bounce away and it returns no reading. This is expected physics, but worth noting for specific applications.

Anonymous

Mar 16, 2026

Rating: 5/5

Reliable and cheap

Bought five of these for a university project. All of them worked out of the box. The consistency between the units is impressive for the price point. Highly recommended for students.

Anonymous

Mar 10, 2026

Rating: 4/5

Good value but needs voltage divider for Pi

Great little module. Just remember that if you are connecting this directly to a Raspberry Pi GPIO, you need a voltage divider on the Echo pin since the Pi is 3.3V logic and this outputs 5V. Once I added resistors, it worked perfectly.

5 FAQ

Q: Can I connect this directly to a 3.3V Raspberry Pi without extra components?

A: While the VCC can be powered by 5V or 3.3V, the Echo output pin sends a 5V signal. To protect your Raspberry Pi GPIO pins, you must use a voltage divider (two resistors) to step the Echo signal down to 3.3V before connecting it to the Pi.

Q: What is the minimum distance this sensor can measure?

A: The minimum measurable distance is approximately 2cm. Objects closer than 2cm may not be detected reliably or may return a constant low value.

Q: Can this sensor work underwater?

A: No, the HC-SR04 is designed for use in air only. It is not waterproof, and ultrasonic waves propagate differently in water, so it will not function correctly if submerged.

Q: Is there a library available for Python on Raspberry Pi?

A: Yes, there are several popular Python libraries available such as 'gpiozero' and 'RPi.GPIO' that have built-in support or simple examples for interfacing with the HC-SR04 sensor.

Q: Does this come with jumper wires?

A: No, this package includes only the HC-SR04 module itself. Jumper wires are sold separately, but they are standard male-to-female or male-to-male wires depending on your setup.

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