3-color full-color LED SMD modules KY-009

// this constant won't change:
const int redpin = 11;    // the PWM pin the red LED is attached to
const int bluepin = 10;   // the PWM pin the blue LED is attached to
const int greenpin = 9;   // the PWM pin the green LED is attached to

// variables will change:
int val = 0;              // initial LED intensity
int color = 0;            // current LED color (0 = red, 1 = green, 2 = blue)
unsigned long lastChange = 0; // time of last color change

void setup() {
  // declare PWM pin to be an output:
  pinMode(redpin, OUTPUT);
  pinMode(bluepin, OUTPUT);
  pinMode(greenpin, OUTPUT);

  Serial.begin(9600);
  Serial.println("Arduino Examples - SMD RGB LED");
}

void loop() {
  // Cycle through the red, green, and blue colors every 2 seconds
  if (millis() - lastChange >= 2000) {
    lastChange = millis();
    color = (color + 1) % 3; // switch to the next color (0, 1, or 2)

    // Set the PWM values for the current color
    if (color == 0) {
      analogWrite(redpin, 255);
      analogWrite(bluepin, 0);
      analogWrite(greenpin, 0);
    } else if (color == 1) {
      analogWrite(redpin, 0);
      analogWrite(bluepin, 0);
      analogWrite(greenpin, 255);
    } else if (color == 2) {
      analogWrite(redpin, 0);
      analogWrite(bluepin, 255);
      analogWrite(greenpin, 0);
    }
  }
}