Automatic Flashing Color LED with Arduino

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Welcome to the World of Sensors and Modules with Arduino!

The Automatic Flashing Color LED Module is a captivating electronic component designed to bring dynamic and colorful lighting effects to Arduino projects. Unlike manually controlled modules, these devices feature built-in circuitry that automatically cycles through a spectrum of seven vibrant colors. In this sensors and modules guide, we’ll explore its working principle, key features, applications, and how it can enhance your own projects.

If you’re new to Arduino, why not take a look at our Getting Started with Arduino guides. These guides are designed for beginners to learn the fundamental basics of Arduino programming.

How the Automatic Flashing LED Works

The Automatic Flashing Color LED Module involves an internal circuit that controls the illumination of LEDs to produce an automatic color-changing effect. The module seamlessly cycles through the predetermined colors without the need for external input.

Features and Specifications:
  • Operating Voltage: 3.3V ~ 5V.
  • No External Control Needed: Unlike manually controlled modules, the Automatic 7-Color Flashing LED Module does not require external control signals from the Arduino. They operate independently, simplifying integration.
  • Size: 20mm x 17mm.
  • Compatibility: This module is also compatible with other devices like the Raspberry Pi, ESP32, and ESP8266 etc…

Necessary Equipment:

  • Arduino
  • Automatic Flashing Color LED Module
  • Jumper wires
  • Breadboard (optional)

Pin Configuration

Connecting the Automatic Flashing Color LED Module to an Arduino is very simple. The connections are as follows:

  • S (or left pin) of the Automatic Flashing Color LED Module to Digital pin 2 on the Arduino.
  • (or right pin) of the Automatic Flashing Color LED Module to GND on the Arduino.

Some modules may use the center pin, right pin, or both for GND.

Pin labels may vary.

Automatic Flashing Color LED Module with Arduino Diagram

KY-034 Automatic Flashing Color LED Module Fritzing Part is created by and published under Creative Commons Attribution-ShareAlike 4.0 International license

Arduino Code Example

// Define the pin to which the 7-Color Flashing LED Module is connected
const int flashModulePin = 2;  // Connect the module to this digital pin

void setup() {
  // Initialize the Serial communication for debugging

  // Set the module pin as output
  pinMode(flashModulePin, OUTPUT);

  // The module should automatically cycle through colors
  digitalWrite(flashModulePin, HIGH);

void loop() {

Breaking Down the Code

Constant Declaration
  • Defines a constant variable representing the digital pin to which the 7-Color Flash Module is connected.
Setup Function
  • The setup function is executed once when the Arduino starts.
  • Initializes serial communication for debugging.
  • Configures the module pin as an output.
  • Sets the module pin HIGH to initiate the automatic color cycling of the module.
Loop Function
  • Left empty as the Automatic 7-Color Flashing LED Module handles color cycling independently.

Applications and Usage Scenarios

Let’s take a look at some possible applications for this module:

Decorative Lighting

Enhance projects with captivating and dynamic decorative lighting effects, adding an aesthetic touch to displays or installations.

Ambient Lighting

Create ambient lighting scenarios in projects where continuously changing colors contribute to the overall atmosphere.

Educational Projects

Introduce beginners to basic electronics by incorporating Automatic 7-Color Flashing LED Modules into educational projects that demonstrate the beauty of automated color cycling.

Dynamic Light Displays

Easily integrate these modules into projects requiring dynamic and automatic light displays, such as themed exhibits or interactive installations.


In this sensors and modules guide, we explained the functionality of the Automatic 7-Color Flashing LED Module, exploring its working principles, and demonstrating how to interface it with an Arduino for practical applications. The Automatic 7-Color Flashing LED Module offers an effortless way to introduce captivating lighting effects to projects. With their automatic color cycling feature and simple integration, these modules open up creative possibilities for makers and hobbyists. Whether used for decoration, ambient lighting, or educational purposes, Automatic 7-Color Flashing LED Modules provide an accessible and visually appealing tool for your projects.

Discover the endless possibilities for Arduino projects with more of our Sensors and Modules guides.

Luke Barber

Hello, fellow tech enthusiasts! I'm Luke, a passionate learner and explorer in the vast realms of technology. Welcome to my digital space where I share the insights and adventures gained from my journey into the fascinating worlds of Arduino, Python, Linux, Ethical Hacking, and beyond. Armed with qualifications including CompTIA A+, Sec+, Cisco CCNA, Unix/Linux and Bash Shell Scripting, JavaScript Application Programming, Python Programming and Ethical Hacking, I thrive in the ever-evolving landscape of coding, computers, and networks. As a tech enthusiast, I'm on a mission to simplify the complexities of technology through my blogs, offering a glimpse into the marvels of Arduino, Python, Linux, and Ethical Hacking techniques. Whether you're a fellow coder or a curious mind, I invite you to join me on this journey of continuous learning and discovery.

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