KY-011 Two color LED module

3mm Two color LED module KY-011 for Arduino, emits red and green light. You can adjust the amount of each color using PWM.

This module consist of a common cathode 3mm red/green LED and a 0Ω resistor, Since operating voltage is 2.0v ~2.5v you'll need to use limiting resistors to prevent burnout when connecting to the Arduino.

We'll use a couple of 330Ω resistors to limit the current from the Arduino and prevent burning the LED.

The following Arduino sketch will gradually alternate between red and green color.

int redpin = 11; // pin for red signal
int greenpin = 10; // pin for green signal
int val;

void setup() {
	pinMode(redpin, OUTPUT);
	pinMode(greenpin, OUTPUT);
}

void loop() {
	for(val = 255; val > 0; val--) { 
		analogWrite(redpin, val); //dim red
		analogWrite(greenpin, 255 - val); // brighten green
		delay(15);
	}
	for(val = 0; val < 255; val++) { 
		analogWrite(redpin, val); //brighten red
		analogWrite(greenpin, 255 - val); //dim green
		delay(15);
	}
}

• Fritzing Part: KY-011 Two color LED module.
• Fritzing Official Site.