HCSR04 With Built-in RGB LED RUS-04 Module


The HC-SR04 5V Ultrasonic Sensor is one of the most popular robotic sensors used to measure distance in DIY applications for Raspberry Pi and Arduino. It is very easy to use and has just 4 pins.

I found this new version of the sensor online that is essentially the same thing, except it has an RGB input that allows for a beautiful display of colors within the transmitter and receiver cylinders, containing a total of 6 LEDs (3 per cylinder). This is essentially the same sensor as the RUS-04 (which you can find with a google search).

Using the ultrasonic module was super easy as there are many examples online of how to use it with MicroPython and the Pico W because it works the same as the regular HC-SR04. However, in terms of the RGB module, it took me some digging to figure it out because nobody has used this sensor in MicroPython given that it is relatively new.

After some research, I realized that the only example of this sensor online was this gentleman who demonstrated how to use it with Arduino... but I needed it for MicroPython. I eventually found out it followed the WS2812 lighting standard so I eventually found a library I slightly modified for the Pico W which I link here:

Github Link For NeoPixel Library for Raspberry Pi Pico W

But do not be discouraged if you are not using the Pico or Arduino, WS2812 capable libraries are found all over the internet for different devices and coding languages. It is a pretty popular standard so you should not have issues if you are using other forms of the Raspberry Pi or any other controllers with GPIO capability. Even an amateur hobbyist like me could figure it out, and so could you ;)

I thought I would share the code I used and explain it, which will help people use this low-documented device in the future. I encourage hobbyists to get this sensor for a visual effect.

Other Important Notes:

Like the regular HC-SR04, this uses 5V logic, using the Pico or Pico W, which are 3.3 V devices is not recommended without a 5V power supply and voltage shifters. Otherwise, you can risk damaging your device and also having inconsistencies in your ultrasonic readings. I disregard that for the purpose of simplicity for this tutorial

If you do find this useful please like, comment, and subscribe:


    1-) An HC-SR04 Module with RGB


    2-) Jumper Wires

    3-) Raspberry Pi Pico or other 5V devices (Raspberry Pis, Arduinos, etc)

    Step 1-) Physical Setup for RGB Module

    1-) Connect 3 pins as follows, this will be enough to get your RGB input powered. I use GPIO28 on the pico but the others should work as well.

    2-) To setup the ultrasonic portion you can view this video or article:



    That is all you need in terms of the physical setup

    Step 2-) Code Libraries

    1-) Get the neopixel lib I used and add it to the directory in your device saved as neopixel.py


    Based on another example I found online with a small modification

    2-) Add the following code to a file on your Pi:


    Step 3-) How to Use Code

    There are two primary functions you can call in this code, fun() or change_color_with_distance().

    1-) fun()

    For this, you do not need the trigger or echo pins to set up it just randomly changes the colors of any of the 6 LEDs onboard the device, so it can make for some fun colors to look at.

    Also, this helps you get a better idea of how the lights are triggered. You just need to set the LED of your choice with an RGB value and that is the premise of how the whole thing works at a high level. I demonstrate this above in the photos, you can see the random assortment of colors. I only used 6 for this demonstration but you can play around with RGB values!

    2-) change_color_with_distance()

    This function is a cool way to combine the RGB with the Ultrasonic. If you have your trigger and echo pins set up properly, you can use if statements to change the color based on how far the object is. I demonstrate this in the clip attached.

    It is a nice way to know the distance of an object and can have some practical use cases in terms of the visual aspect of a robot, or help in dark spaces.

    Note that there are other things you can do with the library such as change the brightness and play around with an assortment of colors, and of course, you can create your functions as well. This is just to get you started.

    Hope this was clear, this should be all you need to get started, once again you can get the sensor here if you are interested!

    Let me know if you have any questions or concerns.

    Create a free account to access full content.

    All access to code and resources on ShillehTek.

    Signup Now

    Already a member? Sign In

    Explore More on Our Blog

    How to Use ADS1115 with the Raspberry Pi (Part 1)

    How to Use ADS1115 with the Raspberry Pi (Part 1)

    Discover how to expand your Raspberry Pi projects by integrating the ADS1115 ADC for precise analog signal reading....

    How to Install Pip Packages in AWS Lambda Using Docker and ECR

    How to Install Pip Packages in AWS Lambda Using Docker and ECR

    Learn how to streamline AWS Lambda deployments by using Docker and Amazon Elastic Container Registry (ECR) to package...

    Create Tabular Product Descriptions on Your Shopify Store

    Create Tabular Product Descriptions on Your Shopify Store

    Enhance your Shopify store's product pages with our comprehensive guide on implementing tabular descriptions. Learn how to add a...

    SSH Into Raspberry Pi with Tailscale VPN

    SSH Into Raspberry Pi with Tailscale VPN

    Effortlessly access and manage your Raspberry Pi from anywhere using Tailscale's secure mesh VPN.

    Send Email with Lua and the ESP32

    Send Email with Lua and the ESP32

    In this tutorial, we delve into sending emails with the ESP32-S3 using Lua, focusing on the Xedge IDE's built-in SMTP...

    How to Code with Lua on ESP32 with XEdge32

    How to Code with Lua on ESP32 with XEdge32

    Learn how to set up Xedge32 and start coding on the ESP32-S3 with Lua programming!

    Stream Audio From Raspberry Pi to Local Computer

    Stream Audio From Raspberry Pi to Local Computer

    Discover the simplicity of streaming live audio directly from a USB microphone connected to your Raspberry Pi to...

    SSH Raspberry Pi via Cell Phone

    SSH Raspberry Pi via Cell Phone

    This beginner-friendly guide will walk you through remotely controlling your Raspberry Pi using SSH through your cell phone.

    Remotely Control Raspberry Pi via SSH from External Network

    Remotely Control Raspberry Pi via SSH from External Network

    Learn how to SSH into your Raspberry Pi from any network. This is critical in IoT since you can control...

    Stream Video from Raspberry Pi Camera to YouTube Live

    Stream Video from Raspberry Pi Camera to YouTube Live

    Learn how to stream to YouTube from a Raspberry Pi Camera.

    Back to blog

    Leave a comment

    Please note, comments need to be approved before they are published.