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 |
| 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 |
Anonymous
Mar 30, 2026
Rating: 4/5
Good accuracy, wide voltage range helpful
I appreciate that this version supports a wider voltage range. It reads consistently within 1-2cm of actual distance. Only minor issue is that it struggles slightly with soft fabrics, but that's expected for ultrasonic sensors.
Anonymous
Mar 16, 2026
Rating: 5/5
Great replacement part
My old sensor stopped working after a year of heavy use. This genuine replacement fits perfectly and performs exactly like the original. Shipping was fast too.
Anonymous
Mar 09, 2026
Rating: 5/5
Fast response time
The reaction time is impressive. I'm using this for a parking assist system in my garage, and it updates quickly enough to be useful while moving slowly. No lag detected.
Anonymous
Mar 05, 2026
Rating: 5/5
Perfect for Arduino projects
This sensor works flawlessly with my Arduino Uno. The range is accurate up to about 3 meters in my testing, and the library support makes integration very easy. Great value for the price.
Anonymous
Mar 04, 2026
Rating: 4/5
Standard reliable module
This is the standard HC-SR04 we all know and trust. Nothing fancy, just solid performance. Make sure you have a 1k/2k resistor divider if connecting directly to 3.3V logic boards like ESP32, though the description says wide voltage.
Anonymous
Mar 01, 2026
Rating: 5/5
Reliable for school robotics kit
Bought five of these for a university project. All of them worked out of the box. The build quality feels sturdy enough for student handling. Highly recommended for educational purposes.
Q: Does this come with jumper wires?
A: No, this listing is for the sensor module only. Jumper wires are sold separately, but any standard male-to-male jumper wires will work perfectly with the 4-pin header.
Q: Is there a library available for Python?
A: Yes, if you are using a Raspberry Pi, there are several open-source Python libraries available such as 'gpiozero' which has built-in support for the HC-SR04 sensor. You can find examples in our documentation section.
Q: How does rain or humidity affect performance?
A: High humidity or rain can slightly attenuate ultrasonic waves, potentially reducing the maximum effective range or causing occasional false readings. For outdoor use, we suggest adding a simple waterproof housing while keeping the transducer face clear.
Q: Can this sensor be used directly with a 3.3V microcontroller without a voltage divider?
A: While the module operates on a wide voltage input, the Echo pin outputs 5V logic. To safely interface with 3.3V boards like the ESP8266 or Raspberry Pi, we recommend using a voltage divider on the Echo line to prevent damage to the GPIO pins.
Q: What is the minimum detection distance?
A: The minimum measurable distance for the HC-SR04 is approximately 2 centimeters. Objects closer than this may not be detected reliably due to the sonic wave propagation time.
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