Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 3.3V - 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 |
| Interface Type | 4-Pin Header (VCC, Trig, Echo, GND) |
| Compatibility | Arduino, Raspberry Pi, STM32, ESP8266 |
Anonymous
Mar 16, 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 avoidance robot. Wiring was straightforward using the standard library examples.
Anonymous
Mar 13, 2026
Rating: 4/5
Great value, minor noise issues
For the price, this is an excellent module. It occasionally gives a random outlier reading if there is a lot of ambient noise, but averaging three readings solves the problem easily. Good for learning embedded systems.
Anonymous
Mar 11, 2026
Rating: 5/5
Reliable and consistent
We bought ten of these for our workshop classes. All of them worked out of the box. They are robust enough to handle student projects and provide consistent distance measurements for parking assist simulations.
Anonymous
Mar 09, 2026
Rating: 5/5
Standard component, high quality
This is the industry standard ultrasonic sensor for hobbyists. The build quality feels solid, and the pins are well-soldered. It responds quickly to changes in distance, making it ideal for real-time applications.
Anonymous
Mar 05, 2026
Rating: 4/5
Easy to use for beginners
As someone new to electronics, I was worried this would be hard to set up. However, there are tons of tutorials online, and the module itself is very forgiving. It helped me understand how sound waves measure distance.
Anonymous
Mar 03, 2026
Rating: 3/5
Works but needs calibration
The sensor functions as described, but I found the measurements were off by about 1cm compared to a tape measure. After adding a small offset in the code, it became much more accurate. Just be aware you might need to calibrate.
Q: Does this come with jumper wires?
A: No, this listing is for the sensor module only. Jumper wires are not included but can be purchased separately in our accessories section.
Q: What is the minimum detection distance?
A: The minimum measurable distance for this module is approximately 2 centimeters. Objects closer than 2cm may not be detected reliably or may return a maximum range value.
Q: Can this sensor be used directly with a 3.3V logic board like the ESP32?
A: Yes, the HC-SR04 operates on a voltage range of 3.3V to 5V. However, while the VCC can be 3.3V, the Echo pin output is typically 5V TTL. For strict 3.3V logic boards, we recommend using a voltage divider on the Echo pin to prevent potential damage, though many users report it working directly without issues.
Q: How does temperature affect the accuracy?
A: Ultrasonic speed varies with air temperature. For high-precision applications, you can add a temperature sensor (like a DHT11) to your project and adjust the speed of sound constant in your code dynamically. For general hobby use, the default constant is usually sufficient.
Q: Is there a library available for Python/Raspberry Pi?
A: Yes, there are several open-source libraries available for Raspberry Pi using Python, such as 'gpiozero' which has built-in support for ultrasonic sensors, or specific HC-SR04 libraries found on GitHub. You will need to connect the Trigger and Echo pins to GPIO pins on your Pi.
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