Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | DC 5V |
| Static Current | < 2mA |
| Measurement Range | 2cm - 400cm |
| Resolution | 0.3cm |
| Viewing Angle | 15 degrees |
| Trigger Input Signal | 10uS TTL pulse |
| Echo Output Signal | TTL level signal proportional to distance |
| Dimensions | 45mm x 20mm x 15mm |
| Compatible Platforms | Arduino, 51 MCU, STM32, Raspberry Pi |
| Package Contents | 1x HC-SR04 Sensor Module |
Anonymous
Mar 31, 2026
Rating: 5/5
Perfect for my robotics project
This sensor works flawlessly with my STM32 board. The range is accurate up to about 3 meters in my testing, which is plenty for my obstacle avoidance robot. Very easy to interface.
Anonymous
Mar 28, 2026
Rating: 3/5
Works but documentation could be better
The hardware is fine, but I struggled initially to find good example code for the specific 51 module variant I was using. Eventually figured it out via forums.
Anonymous
Mar 23, 2026
Rating: 5/5
Excellent response time
Using this for altitude hold on a small experimental drone. The refresh rate is fast enough for stable hovering at low altitudes. Highly recommended for DIY drones.
Anonymous
Mar 08, 2026
Rating: 4/5
Good value but needs calibration
Great price point for students. I had to tweak the timing code slightly to get precise readings on my 8051 development board, but once calibrated, it performs well.
Anonymous
Mar 04, 2026
Rating: 4/5
Standard performance
It's a standard HC-SR04, nothing fancy, but it does exactly what it says on the tin. Consistent readings and low power consumption make it ideal for battery projects.
Anonymous
Mar 03, 2026
Rating: 5/5
Reliable and durable
We bought a batch of ten for our workshop. All of them worked out of the box. They have survived several drops by beginners, so they seem quite robust.
Q: What is the minimum detection distance?
A: The minimum measurable distance is approximately 2cm. Objects closer than this may not be detected reliably or may return erratic values.
Q: Can this module be directly connected to a 3.3V logic microcontroller?
A: While the module operates at 5V, the Echo pin outputs 5V logic which can damage 3.3V MCUs like some STM32 variants. We recommend using a voltage divider or a logic level converter for the Echo pin.
Q: Is there a library available for the 8051 compiler?
A: We do not provide official libraries, but there are many open-source examples available online specifically for Keil C51 and SDCC compilers that work with this module.
Q: Does this come with jumper wires?
A: No, the package includes only the HC-SR04 sensor module. Jumper wires are sold separately.
Q: How does temperature affect the accuracy?
A: Ultrasonic speed varies with temperature. For high-precision applications, we suggest implementing a temperature compensation algorithm in your code using a separate temperature sensor.
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