Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Voltage	5V DC
Static Current	< 2mA
Measuring Angle	15 degrees
Measuring Range	2cm - 400cm
Resolution	0.3cm
Pin Count	5 Pins
Trigger Input Signal	10µS TTL pulse
Echo Output Signal	TTL level signal proportional to distance
Dimensions	45mm x 20mm x 15mm
Included Items	1x HY-SRF05 Module, 1x User Manual

6 reviews

Anonymous

Mar 29, 2026

Rating: 4/5

Solid performance

Does exactly what it says on the tin. The angle is narrow enough to avoid detecting side walls in tight corridors. Only wish the cable was included, but that's a minor inconvenience.

Anonymous

Mar 28, 2026

Rating: 5/5

Reliable and consistent

I have used several ultrasonic sensors over the years, and this HY-SRF05 is one of the most consistent. The build quality feels sturdy, and the pins are well-soldered. No issues after weeks of continuous testing.

Anonymous

Mar 22, 2026

Rating: 5/5

Great for school projects

Bought this for a final year project involving an autonomous car. It responded quickly and the code examples provided in the manual were easy to adapt. Highly recommended for beginners.

Anonymous

Mar 19, 2026

Rating: 4/5

Good sensor, slight noise at max range

Works well for obstacle avoidance. I noticed some fluctuation in readings when objects are near the 400cm limit, but for general use under 2 meters, it is rock solid. The 5-pin layout is convenient.

Anonymous

Mar 10, 2026

Rating: 5/5

Excellent documentation

The included documentation was a huge plus. It clearly explained the timing diagrams and how to calculate distance from the echo pulse width. Saved me a lot of googling.

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for robotics projects

This sensor works flawlessly with my Arduino Uno. The range is accurate up to about 3 meters in my testing, and the documentation made wiring it up very simple. Great value for the price.

5 FAQ

Q: Can this sensor work underwater?

A: No, this module is designed for air usage only. Ultrasonic waves behave differently in water, and the electronics are not waterproof. Submerging it will damage the unit.

Q: Is this module compatible with 3.3V logic microcontrollers like the ESP32?

A: Yes, but since the echo output is 5V TTL, you should use a voltage divider or a logic level converter to protect the 3.3V input pin on your microcontroller. The trigger input usually accepts 3.3V as high.

Q: What is the minimum detection distance?

A: The minimum measurable distance is approximately 2cm. Objects closer than this may not be detected reliably due to the ringing time of the transducer.

Q: Does the package include jumper wires?

A: No, the package includes only the HY-SRF05 module and the printed documentation. Jumper wires are sold separately.

Q: How many wires do I need to connect for basic operation?

A: You need to connect 4 wires for basic operation: VCC (5V), GND, Trigger, and Echo. The 5th pin is often NC (No Connect) or used for specific mounting configurations depending on the batch, but standard libraries only require the 4 main pins.

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