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In this article, we connect an KY-029 Dual Color LED to an Arduino Uno
The KY-029 Dual Color LED module can emit red and green light. You can adjust the intensity of each color using an Arduino PWM pin or simply switch the LED on/off.
| Operating Voltage | 2.3-2.6V for green, 1.9-2.2V for red |
| Working Current | 20mA |
| Color | Red + Green |
| Wavelength | 571nm + 625nm |
| Luminous Intensity | 20~40mcd, 60~80mcd |
Depending on the input voltage, series resistors are recommended.
| Series resistor (3.3 V) [Red] | 120 Ω |
| Series resistor (3,3 V) [Green] | 120 Ω |
| Series resistor (5 V) [Red] | 220 Ω |
| Series resistor (5 V) [Green] | 220 Ω |
Parts Required
You can connect to the module using dupont style jumper wire.
This should work with other Arduino board – I have tried an Uno and Mega
| Name | Link | |
| Arduino Uno |  |
|
| 37 in one sensor kit | ![](http://ae01.alicdn.com/kf/Scb660656a1534430bdd567806bc61643e.jpg_80x80.jpg") |
|
| Connecting cables |  |
Schematic/Connection
| ARDUINO | SENSOR |
|---|---|
| Pin 11 | LED Red |
| Pin 10 | LED Green |
| GND | GND |
Code Example
This example simply switches the red LED on and off then the green LED on and off
int redLED = 11;
int greenLED = 10;
void setup ()
{
// Initialize output pins for the LEDs
pinMode (redLED, OUTPUT);
pinMode (greenLED, OUTPUT);
}
void loop ()
{
digitalWrite (redLED, HIGH); // LED is switched on
digitalWrite (greenLED, LOW); // LED is switched off
delay (2000);
digitalWrite (redLED, LOW); // LED is switched off
digitalWrite (greenLED, HIGH); // LED is switched on
delay (2000);
}
Here is a pwm example
int redLED = 11;
int greenLED = 10;
int val;
void setup () {
// Initialize output pins for the LEDs
pinMode (redLED, OUTPUT);
pinMode (greenLED, OUTPUT);
}
void loop ()
{
for (val = 255; val> 0; val--)
{
analogWrite (greenLED, val);
analogWrite (redLED, 255-val);
delay (15);
}
for (val = 0; val <255; val++)
{
analogWrite (greenLED, val);
analogWrite (redLED, 255-val);
delay (15);
}
}
Serial Monitor Output
N/A
Links
https://github.com/getelectronics/ArduinoCode/tree/main/37%20Sensor%20Kit/KY-029_2_Color