Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	DC 5V
Static Current	< 2mA
Measuring Angle	15 degrees
Measuring Range	2cm - 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
Connector Type	4-Pin Header (VCC, Trig, Echo, GND)
Compatibility	Arduino, Raspberry Pi, STM32, ESP8266

6 reviews

Anonymous

Mar 26, 2026

Rating: 5/5

Great accuracy for the cost

I was surprised by how stable the readings were. Used it to build a liquid level monitor, and it has been running without issues for weeks.

Anonymous

Mar 24, 2026

Rating: 4/5

Good sensor, needs calibration

Works well for obstacle avoidance robots. I noticed slight variations at very close ranges (under 3cm), but for general use, it is reliable. Easy to wire up.

Anonymous

Mar 22, 2026

Rating: 5/5

Perfect for Arduino Projects

This HC-SR04 module works flawlessly with my Arduino Uno. The distance readings are consistent and accurate within the specified range. Great value for the price.

Anonymous

Mar 21, 2026

Rating: 5/5

Essential for learning electronics

Bought this for a university project. The documentation online is plentiful, and the module itself is robust. It survived several accidental drops during testing.

Anonymous

Mar 10, 2026

Rating: 4/5

Solid performance

Does exactly what it says on the tin. The 5V requirement means you need a logic level converter if using with 3.3V boards, but that is standard for this model.

Anonymous

Mar 05, 2026

Rating: 5/5

Reliable and Affordable

We ordered ten of these for our workshop. All units performed identically. The response time is fast enough for real-time applications like parking sensors.

5 FAQ

Q: What is the minimum detection distance?

A: The effective measuring range starts from approximately 2cm. Objects closer than 2cm may not be detected reliably or may return inconsistent values.

Q: Is there a library available for ESP32?

A: Yes, there are numerous open-source libraries available for the ESP32 platform, such as 'NewPing' or standard example codes found in the ESP32 community forums that support the HC-SR04 protocol.

Q: How do I handle multiple sensors on one microcontroller?

A: You can connect multiple modules by assigning separate Trigger and Echo pins for each sensor on your microcontroller. Ensure you trigger them sequentially rather than simultaneously to avoid acoustic interference between the sensors.

Q: Can this sensor be used directly with a 3.3V Raspberry Pi?

A: The HC-SR04 operates at 5V. While the trigger input often accepts 3.3V, the echo output returns 5V which can damage a Raspberry Pi GPIO pin. We recommend using a voltage divider or a logic level converter for the echo pin.

Q: Does this module come with jumper wires?

A: No, the package includes only the HC-SR04 ultrasonic module. Jumper wires are sold separately to allow you to choose the length and color you prefer for your specific setup.

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