Attributes

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

6 reviews

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.

5 FAQ

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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