// Define pins for single-color LEDs
const int led1Pin = 2;
const int led2Pin = 3;

// Define pins for RGB LEDs
const int rgb1R = 4;
const int rgb1G = 5;
const int rgb1B = 6;
const int rgb2R = 7;
const int rgb2G = 8;
const int rgb2B = 9;

// Define pins for LED Bar Graph
const int barGraph1 = A1;
const int barGraph2 = A2;
const int barGraph3 = A3;
const int barGraph4 = A4;
const int barGraph5 = A5;
const int barGraph6 = A6;

void setup() {
  // Set all pins as OUTPUT
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(rgb1R, OUTPUT);
  pinMode(rgb1G, OUTPUT);
  pinMode(rgb1B, OUTPUT);
  pinMode(rgb2R, OUTPUT);
  pinMode(rgb2G, OUTPUT);
  pinMode(rgb2B, OUTPUT);
  pinMode(barGraph1, OUTPUT);
  pinMode(barGraph2, OUTPUT);
  pinMode(barGraph3, OUTPUT);
  pinMode(barGraph4, OUTPUT);
  pinMode(barGraph5, OUTPUT);
  pinMode(barGraph6, OUTPUT);
  
  // Initialize all outputs to LOW (all LEDs off)
  digitalWrite(led1Pin, LOW);
  digitalWrite(led2Pin, LOW);
  digitalWrite(rgb1R, LOW);
  digitalWrite(rgb1G, LOW);
  digitalWrite(rgb1B, LOW);
  digitalWrite(rgb2R, LOW);
  digitalWrite(rgb2G, LOW);
  digitalWrite(rgb2B, LOW);
  digitalWrite(barGraph1, LOW);
  digitalWrite(barGraph2, LOW);
  digitalWrite(barGraph3, LOW);
  digitalWrite(barGraph4, LOW);
  digitalWrite(barGraph5, LOW);
  digitalWrite(barGraph6, LOW);
}

void loop() {
  // State 1 (Duration: 2 seconds)
  // The monochrome LED (led1) lights up and the monochrome LED (led2) goes out.
  // RGB LED (rgb1) displays red.
  // The first three segments of the bar graph (bargraph1) light up.
  digitalWrite(led1Pin, HIGH);
  digitalWrite(led2Pin, LOW);
  
  digitalWrite(rgb1R, HIGH);
  digitalWrite(rgb1G, LOW);
  digitalWrite(rgb1B, LOW);
  
  digitalWrite(rgb2R, LOW);
  digitalWrite(rgb2G, LOW);
  digitalWrite(rgb2B, LOW);
  
  digitalWrite(barGraph1, HIGH);
  digitalWrite(barGraph2, HIGH);
  digitalWrite(barGraph3, HIGH);
  digitalWrite(barGraph4, LOW);
  digitalWrite(barGraph5, LOW);
  digitalWrite(barGraph6, LOW);
  
  delay(2000);  // Wait for 2 seconds
  
  // State 2 (Duration: 2 seconds)
  // The monochrome LED (led2) lights up and the monochrome LED (led1) goes out.
  // RGB LED (rgb2) displays green.
  // The last three segments of the bar graph (bargraph1) light up.
  digitalWrite(led1Pin, LOW);
  digitalWrite(led2Pin, HIGH);
  
  digitalWrite(rgb1R, LOW);
  digitalWrite(rgb1G, LOW);
  digitalWrite(rgb1B, LOW);
  
  digitalWrite(rgb2R, LOW);
  digitalWrite(rgb2G, HIGH);
  digitalWrite(rgb2B, LOW);
  
  digitalWrite(barGraph1, LOW);
  digitalWrite(barGraph2, LOW);
  digitalWrite(barGraph3, LOW);
  digitalWrite(barGraph4, HIGH);
  digitalWrite(barGraph5, HIGH);
  digitalWrite(barGraph6, HIGH);
  
  delay(2000);  // Wait for 2 seconds
  
  // State 3 (Duration: 2 seconds)
  // Both monochrome LEDs (LED 1, LED 2) are lit up.
  // Both RGB LEDs (rgb1, rgb2) display a cyan color (blue + green).
  // All six segments of the bar graph (bargraph1) light up.
  digitalWrite(led1Pin, HIGH);
  digitalWrite(led2Pin, HIGH);
  
  digitalWrite(rgb1R, LOW);
  digitalWrite(rgb1G, HIGH);
  digitalWrite(rgb1B, HIGH);
  
  digitalWrite(rgb2R, LOW);
  digitalWrite(rgb2G, HIGH);
  digitalWrite(rgb2B, HIGH);
  
  digitalWrite(barGraph1, HIGH);
  digitalWrite(barGraph2, HIGH);
  digitalWrite(barGraph3, HIGH);
  digitalWrite(barGraph4, HIGH);
  digitalWrite(barGraph5, HIGH);
  digitalWrite(barGraph6, HIGH);
  
  delay(2000);  // Wait for 2 seconds
}