Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	5V DC
Static Current	< 2mA
Measuring Range	2cm - 400cm
Resolution	0.3cm
Measuring Angle	15 degrees
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, ESP8266
Package Contents	1x HC-SR04 Sensor Module

6 reviews

Anonymous

Mar 31, 2026

Rating: 5/5

Great for learning sensors

As a beginner, I found this very easy to integrate. There are tons of tutorials online. It helped me understand how time-of-flight measurement works.

Anonymous

Mar 27, 2026

Rating: 4/5

Solid performance for the cost

Not industrial grade, but perfect for hobbyist prototypes. The beam angle is reasonable, and it handles ambient noise well indoors.

Anonymous

Mar 16, 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 06, 2026

Rating: 4/5

Good accuracy, easy to wire

Used this for a university project. Wiring is straightforward, and the library support is excellent. Only minor issue is sensitivity to soft surfaces, but that's expected with ultrasonic tech.

Anonymous

Mar 05, 2026

Rating: 5/5

Reliable and cheap

Bought five of these for a parking assist system. All of them worked out of the box. The response time is fast enough for real-time applications.

Anonymous

Mar 04, 2026

Rating: 5/5

Exceeded expectations

I was skeptical about the low price, but this module is robust. I've been using it in an obstacle-avoidance robot for weeks without any failures.

5 FAQ

Q: How do I calculate distance from the pulse duration?

A: Distance (cm) = (Duration in microseconds / 2) / 29.1. We divide by 2 because the sound wave travels to the object and back.

Q: What is the minimum detection distance?

A: The minimum measurable distance is approximately 2cm. Objects closer than this may not be detected accurately due to the ringing effect of the transducer.

Q: Does this come with jumper wires?

A: No, the package includes only the HC-SR04 module itself. Jumper wires are sold separately.

Q: Is it waterproof for outdoor use?

A: No, the standard HC-SR04 is not waterproof. For outdoor or wet environments, please look for the waterproof version with a sealed casing.

Q: Can this sensor work with 3.3V logic boards like ESP32?

A: Yes, but you may need a voltage divider or level shifter for the Echo pin since it outputs 5V. The VCC must remain at 5V for stable operation.

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