Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 5V |
| Static Current | < 2mA |
| Measuring Range | 2cm - 400cm |
| Resolution | 0.3cm |
| Measuring Angle | 15 degrees |
| Trigger Input Signal | 10µS TTL pulse |
| Echo Output Signal | TTL level signal proportional to distance |
| Dimensions | 45mm x 20mm x 15mm |
| Compatibility | Arduino, Raspberry Pi, STM32 |
| Package Includes | 1x Ultrasonic Sensor Module |
Anonymous
Mar 11, 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. Setup was incredibly easy using standard libraries.
Anonymous
Mar 05, 2026
Rating: 4/5
Works well after calibration
Out of the box, the readings were slightly off by a centimeter or two, but after adding a small calibration offset in the code, it is very precise. Good build quality for the cost.
Anonymous
Mar 04, 2026
Rating: 4/5
Good value but sensitive to angle
Great sensor for the price. It measures distance reliably, but you need to ensure the target surface is relatively flat and perpendicular to the sensor. Soft materials like cloth can sometimes absorb the sound waves.
Anonymous
Mar 03, 2026
Rating: 5/5
Essential for university projects
Bought five of these for a group project involving automated parking systems. They all performed consistently. The documentation online is plentiful, making it easy to integrate into code.
Anonymous
Mar 03, 2026
Rating: 5/5
Standard choice for a reason
This is the industry standard for a reason. It's cheap, reliable, and easy to find tutorials for. I use it for liquid level detection in tanks and it works perfectly.
Anonymous
Mar 01, 2026
Rating: 5/5
Reliable and robust
I've used these sensors in various environmental conditions indoors and they haven't failed me yet. The response time is fast enough for real-time applications. Highly recommended for beginners.
Q: Does this module work with 3.3V logic levels?
A: The module requires 5V power. However, the Echo pin outputs 5V logic. If connecting to a 3.3V microcontroller, you should use a voltage divider on the Echo pin to prevent damage.
Q: How does temperature affect the accuracy?
A: Sound speed varies with temperature. For high-precision applications, you may want to incorporate a temperature sensor to adjust the speed of sound constant in your calculations.
Q: Is a library required to use this with Arduino?
A: While libraries like NewPing make integration easier, they are not strictly required. You can write your own code using the pulseIn() function to read the echo duration.
Q: Can this sensor measure distances underwater?
A: No, the HC-SR04 uses ultrasonic sound waves which do not propagate effectively from air into water. It is designed for air-based distance measurement only.
Q: What is the minimum distance this module can detect?
A: The minimum measurable distance is approximately 2cm. Objects closer than this may not be detected reliably or may return inconsistent readings.
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