Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	DC 5V
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, STM32, Raspberry Pi, 51 MCU
Package Includes	1x HC-SR04 Ultrasonic Sensor Module

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Reliable for classroom kits

We bought twenty of these for our electronics workshop. They are robust enough to handle student use and provide consistent results when paired with STM32 boards.

Anonymous

Mar 27, 2026

Rating: 4/5

Solid performance

I've used these sensors for years. This batch is consistent with previous ones I've bought. The minimum range of 2cm is accurate; anything closer returns garbage data, which is expected behavior.

Anonymous

Mar 25, 2026

Rating: 5/5

Easy to code for beginners

As someone new to embedded systems, I found this very forgiving. There are tons of tutorials online for the HC-SR04, and this module worked on the first try with the example code.

Anonymous

Mar 19, 2026

Rating: 5/5

Exactly as described

Fast shipping and the product matches the description perfectly. The pinout is standard, making it very easy to integrate into existing projects without extra adapters.

Anonymous

Mar 16, 2026

Rating: 4/5

Good value but sensitive to angle

Great little module for the price. It works well for basic distance measurement. Just note that the target needs to be relatively perpendicular to the sensor for the most accurate readings.

Anonymous

Mar 15, 2026

Rating: 5/5

Perfect for Arduino robotics projects

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

5 FAQ

Q: Can this sensor be used directly with a 3.3V logic system like ESP32?

A: The module operates at 5V. While it can often work with 3.3V systems, we recommend using a logic level converter for the Trigger and Echo pins to ensure stability and prevent potential damage to 3.3V microcontrollers.

Q: Can it measure liquid levels in a tank?

A: It can measure the distance to the surface of a liquid if the surface is relatively calm and flat. However, foam, ripples, or vapor may scatter the ultrasonic waves and cause inaccurate readings. It is not waterproof, so ensure the module stays dry.

Q: Is there a library available for STM32CubeIDE?

A: Yes, there are several open-source drivers available for STM32. You can easily write your own using the timer input capture feature or find community-contributed HAL libraries on GitHub specifically for the HC-SR04.

Q: What is the accuracy of the measurement in millimeters?

A: The resolution is approximately 3mm (0.3cm). In ideal conditions with a flat, perpendicular target, the accuracy is generally within ±3mm, though environmental factors like temperature and surface texture can affect this.

Q: Does this come with jumper wires?

A: No, this package includes only the HC-SR04 sensor module. Jumper wires are sold separately, but any standard male-to-male dupont wires will work perfectly with the pin header.

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