Description
Reviews
| 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 |
| Display Type | 4-Digit 7-Segment LED |
| Output Interface | TTL Serial / IO Trigger |
| Board Dimensions | 45mm x 28mm |
| Mounting Hole Size | 3mm diameter |
| Compatible MCU | Arduino, STM32, ESP32, Raspberry Pi |
Anonymous
Mar 20, 2026
Rating: 4/5
Good for ground testing
Used this to test obstacle avoidance logic before installing sensors on my drone frame. The real-time readout is very convenient. Just remember it runs on 5V, not 3.3V directly.
Anonymous
Mar 18, 2026
Rating: 4/5
Great value, clear display
Very accurate within the stated range. The serial output is stable. Only minor issue is the brightness of the LEDs is fixed, which can be a bit bright in a dark room, but overall excellent board.
Anonymous
Mar 18, 2026
Rating: 5/5
Ideal for university projects
Bought this for a final year robotics project. The integration of the HC-SR04 sensor with the driver circuit and display makes it a standalone unit. Saved me hours of wiring.
Anonymous
Mar 17, 2026
Rating: 5/5
Easy to use for beginners
As someone new to electronics, having the distance displayed immediately helped me understand how ultrasonic sensors work without writing complex code first. Highly recommended for learners.
Anonymous
Mar 17, 2026
Rating: 5/5
Perfect for quick prototyping
The built-in digital display saves so much time when debugging distance algorithms. No need to hook up an external screen just to verify readings. Works flawlessly with my Arduino Uno.
Anonymous
Mar 04, 2026
Rating: 5/5
Robust and reliable
We use these in our workshop for teaching sensor fundamentals. They hold up well to frequent plugging and unplugging. The measurement consistency is impressive for the price point.
Q: What is the refresh rate of the digital tube display?
A: The display updates approximately 10 to 15 times per second, providing near real-time feedback for moving objects within the sensing range.
Q: Can this module be powered directly by a 3.3V pin on an ESP32?
A: No, the HC-SR04 sensor and the onboard logic require a stable 5V supply. Please use the 5V pin on your microcontroller or an external 5V source.
Q: Does the serial output send data continuously or only when triggered?
A: The board continuously measures and updates the display. The serial output streams distance data at a standard baud rate (usually 9600) automatically upon power-up.
Q: Can I daisy-chain multiple modules on one UART port?
A: No, each module transmits data independently. To use multiple modules, you should connect them to separate UART ports or use a software serial approach with distinct trigger pins.
Q: Is there a way to adjust the sensitivity or threshold?
A: This specific test board model does not include a potentiometer for sensitivity adjustment. It operates with factory-calibrated thresholds optimized for general use.
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