Introduction
In this tutorial, we will learn about the KY-029 module, what is a 2-colour LED and we will build a simple 2-colour blinker using an Arduino and the KY-029 module.
Yin Yi 2 Colour 3mm LED Module KY-029
The KY-029 Module will be our main component for this tutorial. This module has a 2-colour LED mounted on a breakout board. Figure 1 shows the module as seen in fritzing.
Pin Out
The KY-029 module has three pins.
| Pin | Description |
|---|---|
| (-) | GND |
| middle | Red |
| S | Green |
What is a 2-Colour LED
A 2-color LED is simply two different coloured LED’s assembled in one package. The colour of each LED is Red and Green.
Project - Arduino 2 Colour Blinker
After learning about the KY-029 module and the 2-colour LED, it is now time to build a project using the module. Our project will alternate the color (red/green) of the LED every one-second.
Components
For this project, we need the following components:
- Arduino Uno board (1 pc.)
- KY-029 Yin Yi 2 Colour 3mm LED Module (1 pc.)
- Jumper wires
Â
Wiring Diagram
The below image shows the connection between the Arduino Uno and the KY-029 Yin Yi 2 Colour 3mm LED Module. The two 330-ohm resistors are needed between the Arduino and the Green and Red pins of the KY-029 to protect the LED from over-current.
The KY-029 module pins are connected to the Arduino Uno board as follows:
| Component Pin | Resistor | UNO Board Pin |
|---|---|---|
| (-) | none | GND |
| middle | 330-ohm resistor | 8 |
| S | 330-ohm resistor | 9 |
Code
Below is the Arduino sketch for our project. I have added comments to explain important parts of the code. Save the code as KY-029.ino and upload it to your Arduino board.
// Arduino and KY-029 module
void setup() {
pinMode(8, OUTPUT); // module's red pin
pinMode(9, OUTPUT); // module's green pin
digitalWrite(8, LOW); // switch off red
digitalWrite(9, LOW); // switch off green
}
void loop() {
digitalWrite(8, HIGH); // switch on red
delay(1000); // wait 1 second
digitalWrite(8, LOW); // switch off red
digitalWrite(9, HIGH); // switch on green
delay(1000); // wait 1 second
digitalWrite(9, LOW); // switch off green
}
Project Test
Apply power to your Arduino Uno board. The KY-029 should alternate colour every one-second.
