Interface RGB LED with Arduino

int redPin = 9;    // Pin connected to the red LED
int greenPin = 10; // Pin connected to the green LED
int bluePin = 11;  // Pin connected to the blue LED

void setup() {
  // Set the RGB LED pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  // Set the LED to red
  setColor(0, 255, 255); // Red ON, Green and Blue OFF
  delay(1000); // Wait for 1 second

  // Set the LED to green
  setColor(255, 0, 255); // Green ON, Red and Blue OFF
  delay(1000); // Wait for 1 second

  // Set the LED to blue
  setColor(255, 255, 0); // Blue ON, Red and Green OFF
  delay(1000); // Wait for 1 second

  // Set the LED to yellow
  setColor(0, 0, 255); // Red and Green ON, Blue OFF
  delay(1000); // Wait for 1 second

  // Set the LED to cyan
  setColor(255, 0, 0); // Green and Blue ON, Red OFF
  delay(1000); // Wait for 1 second

  // Set the LED to magenta
  setColor(0, 255, 0); // Red and Blue ON, Green OFF
  delay(1000); // Wait for 1 second

  // Turn off the LED
  setColor(255, 255, 255);
  delay(1000); // Wait for 1 second
}

// Function to set the color of the RGB LED
void setColor(int redValue, int greenValue, int blueValue) {
  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}

#define BUTTON_PIN 8
#define RED_PIN 9
#define GREEN_PIN 10
#define BLUE_PIN 11

unsigned long lastPressTime = 0;
unsigned long pressDuration = 0;
unsigned long debounceTime = 200;          // Debounce delay
unsigned long doublePressInterval = 500;  // Max time between double presses
unsigned long longPressDuration = 2000;   // Minimum time for a long press

bool fadeEffect = false;  // Flag for fade effect
int colorIndex = 0;       // Tracks current static color index

// Define static colors (R, G, B)
int colors[][3] = {
  {255, 0, 0},   // Red
  {0, 255, 0},   // Green
  {0, 0, 255},   // Blue
  {255, 255, 0}, // Yellow
  {0, 255, 255}, // Cyan
  {255, 0, 255}, // Magenta
  {255, 255, 255} // White
};

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);  // Push switch module signal pin
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);

  setColor(0, 0, 0);  // Turn off LED initially
}

void loop() {
  static bool lastButtonState = HIGH;
  bool buttonState = digitalRead(BUTTON_PIN);

  // Track press duration
  if (buttonState == LOW) {
    pressDuration = millis() - lastPressTime;
  } else if (lastButtonState == LOW && buttonState == HIGH) {
    // Button released
    if (pressDuration > longPressDuration) {
      // Long press detected
      fadeEffect = false;  // Stop fade effect
      setColor(0, 0, 0);   // Turn off LED
      Serial.println("Long Press: LED Off");
    } else if (pressDuration < longPressDuration && pressDuration > debounceTime) {
      unsigned long currentTime = millis();

      if (currentTime - lastPressTime < doublePressInterval && !fadeEffect) {
        // Double press detected
        fadeEffect = true;  // Start fade effect
        Serial.println("Double Press: Fade Effect On");
      } else if (fadeEffect) {
        // Toggle fade effect off
        fadeEffect = false;
        Serial.println("Double Press: Fade Effect Off");
      } else {
        // Single press detected
        colorIndex = (colorIndex + 1) % (sizeof(colors) / sizeof(colors[0]));  // Cycle through colors
        setColor(colors[colorIndex][0], colors[colorIndex][1], colors[colorIndex][2]);
        Serial.println("Single Press: Change Color");
      }
    }
    lastPressTime = millis();  // Update last press time
    pressDuration = 0;         // Reset press duration
  }

  lastButtonState = buttonState;

  // Handle fade effect
  if (fadeEffect) {
    fadeColors();
  }
}

// Function to fade colors (breathing effect)
void fadeColors() {
  for (int i = 0; i <= 255; i++) {  // Fade up
    setColor(i, 0, 255 - i);  // Purple to Blue
    delay(5);
  }
  for (int i = 255; i >= 0; i--) {  // Fade down
    setColor(i, 255 - i, 0);  // Blue to Green
    delay(5);
  }
  for (int i = 0; i <= 255; i++) {  // Fade up
    setColor(255 - i, i, 0);  // Green to Red
    delay(5);
  }
  for (int i = 255; i >= 0; i--) {  // Fade down
    setColor(0, i, 255 - i);  // Red to Purple
    delay(5);
  }
}

// Function to set RGB LED module color
void setColor(int red, int green, int blue) {
  analogWrite(RED_PIN, red);
  analogWrite(GREEN_PIN, green);
  analogWrite(BLUE_PIN, blue);
}