Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	HC-SR04
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
Dimensions	45mm x 20mm x 15mm
Interface Type	4-Pin Header (VCC, Trig, Echo, GND)
Compatibility	Arduino, Raspberry Pi, STM32

6 reviews

Anonymous

Mar 19, 2026

Rating: 5/5

Reliable and cheap

Bought five of these for a parking assist system I'm building. All five arrived working perfectly. The response time is fast enough for real-time applications.

Anonymous

Mar 08, 2026

Rating: 5/5

Perfect for Arduino robotics projects

This sensor works flawlessly with my Arduino Uno. The distance readings are consistent and accurate within the specified range. Great value for the price.

Anonymous

Mar 05, 2026

Rating: 4/5

Great for education

We use these in our high school robotics club. They are durable enough to handle student mistakes and provide clear data for learning logic and physics.

Anonymous

Mar 04, 2026

Rating: 5/5

Standard component, works as advertised

If you need a basic ultrasonic sensor, this is the industry standard. Documentation is everywhere online, making it very beginner-friendly.

Anonymous

Mar 03, 2026

Rating: 4/5

Good accuracy, easy to wire

Used this for a university project. Wiring was straightforward using standard libraries. It struggles slightly with very soft surfaces that absorb sound, but that is expected physics.

Anonymous

Mar 02, 2026

Rating: 5/5

Excellent range detection

Tested up to 3 meters and it held up well. The 15-degree cone is narrow enough to avoid too much interference from nearby objects in tight spaces.

5 FAQ

Q: What is the minimum object size this can detect?

A: The sensor can generally detect objects as small as a few centimeters in diameter, provided they are reflective enough to bounce the ultrasonic wave back to the receiver. Small wires may be difficult to detect consistently.

Q: How do I handle multiple sensors on one board without interference?

A: To use multiple sensors, trigger them sequentially rather than simultaneously. Add a small delay (e.g., 60ms) between triggering each sensor to allow the sound waves from the previous measurement to dissipate.

Q: Can this sensor be powered directly by a 3.3V Raspberry Pi GPIO pin?

A: While the module operates at 5V, many users successfully run it on 3.3V logic levels. However, for stable performance, we recommend using a 5V power source and a voltage divider or level shifter for the Echo pin to protect the Pi.

Q: Does this come with jumper wires included?

A: No, the package includes only the ultrasonic module itself. Jumper wires are sold separately, but any standard male-to-male jumper wires will work.

Q: Is this waterproof for outdoor use?

A: No, the HC-SR04 is not waterproof. The exposed transducers and circuit board can be damaged by moisture. For outdoor use, you must house it in a waterproof enclosure with a sound-permeable front.

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