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Anyone tested the 5 Pin HY-SRF05 Ultrasonic Module for stable distance sensing?

Kasuo
Associate II

‎2025-10-04 1:22 AM

Hi everyone,

I’ve been working on a small obstacle avoidance setup for a robot project and came across the 5 Pin HY-SRF05 Ultrasonic Module. It’s similar to the HC-SR04 but with an additional OUT pin and claims higher accuracy, up to 3mm, with a range between 2cm and 450cm.

Before I start integrating it, I’d like to ask for feedback from anyone who has used this module:

  • How reliable is the distance reading compared to the HC-SR04?

  • Does the extra OUT pin provide any practical advantage when connected to Arduino or ESP32 boards?

  • Have you noticed any signal noise or unstable readings when objects have uneven or non-flat surfaces?

  • Can it handle outdoor conditions, or is it best kept indoors?

I’m planning to test it for both robotics and water-level monitoring applications, so consistency and stability are pretty important.

Any tips or shared sketches would be greatly appreciated.

Thanks in advance for your input!

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Andrew Neil
Super User

‎2025-10-04 1:26 AM

Again, this has nothing to do with ST:

See: https://community.st.com/t5/others-hardware-and-software/confused-about-motion-sensor-types/m-p/837352/highlight/true#M32470

And: https://community.st.com/t5/others-hardware-and-software/confused-about-motion-sensor-types/m-p/837362/highlight/true#M32471

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
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