2-Color 5mm LED Module (KY-011)

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);
}
}