Interfacing KY-034 Automatic Flashing Color LED with Arduino


Welcome to the exciting world of interfacing electronic components with Arduino! In this guide, we’ll explore how to Interfacing KY-034 Automatic Flashing Color LED with Arduino. The KY-034 module provides a colorful and dynamic lighting effect, making it ideal for various Arduino projects requiring attention-grabbing visual displays. Let’s delve into the details of the KY-034 Automatic Flashing Color LED and learn how to integrate it with Arduino for captivating lighting effects.

Hardware Required

You will require the following Hardware Components for the How to Interfacing KY-034 Automatic Flashing Color LED with Arduino.

Components#Buy From Amazon
Arduino UNO1Buy Now
KY-034 Automatic Flashing Color LED1Buy Now
9v DC Adapter (Optional)1Buy Now
Jumper Wires3Buy Now
Breadboard1Buy Now

What is KY-034 Flashing Color LED?

The KY-034 Automatic Flashing Color LED is a module equipped with multiple RGB (Red, Green, Blue) LEDs that automatically cycle through different colors and flash patterns. It features an integrated control circuitry that simplifies the process of creating eye-catching lighting effects, making it suitable for decorative, artistic, and ambient lighting applications.



  1. Operating Voltage: Typically operates at 5V, compatible with Arduino’s voltage levels.
  2. LED Type: Consists of multiple RGB LEDs capable of producing a wide range of colors.
  3. Flashing Patterns: Offers various flashing patterns and color transition effects for dynamic lighting displays.
  4. Control Interface: Interface with Arduino using digital output pins for controlling the flashing patterns and colors.
  5. Dimensions: Compact form factor suitable for integration into Arduino projects with limited space constraints.


  1. Automatic Flashing: Automatically cycles through different colors and flashing patterns without the need for external control signals.
  2. RGB Color Mixing: Allows for the creation of custom colors by adjusting the intensity of the red, green, and blue LEDs.
  3. Adjustable Speed: Provides adjustable speed settings to control the rate of color transitions and flashing effects.
  4. Low Power Consumption: Designed for low power operation, making it suitable for battery-powered applications.
  5. Easy Integration: Simple interface and control mechanism for seamless integration with Arduino projects.



Pin Configuration

Middle PinGround
SigSignal out OR VCC

Circuit Connections

To connect the KY-034 Automatic Flashing Color LED module with Arduino:

  1. S (Signal) – Connect to pin 13 on the Arduino (or any other digital input pin)
  2. GND (-) – Ground. Connect to GND on the Arduino. This pin might also be internally connected to the middle pin.

Make sure to double-check the connections and pin configurations to ensure proper functionality and prevent damage to the components.

ArduinoKY-034 Module

Circuit Diagram

The following circuit shows you the connection of the Interfacing KY-034 Automatic Flashing Color LED with Arduino. Please make the connection carefully


Installing Arduino IDE Software

First, you will require to Download the updated version of Arduino IDE Software and Install it on your PC or laptop. if you Learn How to install the Arduino step-by-step guide then click on how to install Arduino Button given Blow


In the following sketch, we’ll use pin 13 on the Arduino to repeatedly turn the LED on the module on for 3 seconds and off for a second.

//For more Projects:

int ledPin = 13;    // pin to control KY-034

void setup() {                
  pinMode(ledPin, OUTPUT);    // define pin as output

void loop() {
  digitalWrite(ledPin, HIGH); // turn LED on
  delay(3000);                // wait for 3 seconds
  digitalWrite(ledPin, LOW);  // turn LED off
  delay(1000);                // wait for a second


  1. Decorative Lighting: Use the KY-034 LED module for decorative lighting applications such as holiday decorations, party ambiance, and mood lighting.
  2. Art Projects: Incorporate the dynamic lighting effects of the KY-034 module into art installations, sculptures, and interactive exhibits.
  3. Signage and Displays: Enhance signage and displays with attention-grabbing lighting effects to attract attention and convey information effectively.
  4. DIY Projects: Integrate the KY-034 module into DIY projects, hobbies, and crafts to add visual interest and aesthetic appeal.
  5. Education and Learning: Use the KY-034 LED module in educational settings to teach concepts related to color theory, lighting effects, and Arduino programming.


The KY-034 Automatic Flashing Color LED offers a fun and versatile solution for creating captivating lighting effects with Arduino. With its automatic flashing capabilities, RGB color mixing, and adjustable speed settings, the KY-034 module provides endless possibilities for adding visual flair to Arduino projects. Let’s explore the creative potential of the KY-034 LED module and illuminate our projects with dazzling colors and dynamic lighting effects!

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