#include <Servo.h>  // Included as allowed per the instructions

// Define pin assignments
// Single LED
const int led1Pin = 22;

// RGB LED pins
// rgb1 pins
const int rgb1_R = 2;
const int rgb1_G = 3;
const int rgb1_B = 4;
// rgb2 pins
const int rgb2_R = 5;
const int rgb2_G = 6;
const int rgb2_B = 7;
// rgb3 pins
const int rgb3_R = 8;
const int rgb3_G = 9;
const int rgb3_B = 10;

// LED bar graph segments (we use 4 segments)
const int bar1 = 11;  // segment 1
const int bar2 = 12;  // segment 2
const int bar3 = 13;  // segment 3
const int bar4 = 14;  // segment 4

void setup() {
  // Set output for led1
  pinMode(led1Pin, OUTPUT);
  
  // Set RGB LED pins as outputs
  pinMode(rgb1_R, OUTPUT);
  pinMode(rgb1_G, OUTPUT);
  pinMode(rgb1_B, OUTPUT);
  
  pinMode(rgb2_R, OUTPUT);
  pinMode(rgb2_G, OUTPUT);
  pinMode(rgb2_B, OUTPUT);
  
  pinMode(rgb3_R, OUTPUT);
  pinMode(rgb3_G, OUTPUT);
  pinMode(rgb3_B, OUTPUT);
  
  // Set LED bar graph pins as outputs
  pinMode(bar1, OUTPUT);
  pinMode(bar2, OUTPUT);
  pinMode(bar3, OUTPUT);
  pinMode(bar4, OUTPUT);
  
  // Initialization: All LEDs OFF
  digitalWrite(led1Pin, LOW);
  
  // Turn off all RGB channels
  digitalWrite(rgb1_R, LOW);
  digitalWrite(rgb1_G, LOW);
  digitalWrite(rgb1_B, LOW);
  
  digitalWrite(rgb2_R, LOW);
  digitalWrite(rgb2_G, LOW);
  digitalWrite(rgb2_B, LOW);
  
  digitalWrite(rgb3_R, LOW);
  digitalWrite(rgb3_G, LOW);
  digitalWrite(rgb3_B, LOW);
  
  // Turn off all bar graph segments (the anodes)
  digitalWrite(bar1, LOW);
  digitalWrite(bar2, LOW);
  digitalWrite(bar3, LOW);
  digitalWrite(bar4, LOW);
}

void loop() {
  // Stage 1 : (0-2 seconds)
  // led1: off
  digitalWrite(led1Pin, LOW);
  
  // rgb1: red, rgb2 and rgb3: off
  digitalWrite(rgb1_R, HIGH);
  digitalWrite(rgb1_G, LOW);
  digitalWrite(rgb1_B, LOW);
  
  digitalWrite(rgb2_R, LOW);
  digitalWrite(rgb2_G, LOW);
  digitalWrite(rgb2_B, LOW);
  
  digitalWrite(rgb3_R, LOW);
  digitalWrite(rgb3_G, LOW);
  digitalWrite(rgb3_B, LOW);
  
  // Bar graph: light up only segment 1
  digitalWrite(bar1, HIGH);
  digitalWrite(bar2, LOW);
  digitalWrite(bar3, LOW);
  digitalWrite(bar4, LOW);
  
  delay(2000);
  
  // Stage 2 : (2-4 seconds)
  // led1: on
  digitalWrite(led1Pin, HIGH);
  
  // rgb1: green, rgb2: blue, rgb3: off
  // rgb1: green
  digitalWrite(rgb1_R, LOW);
  digitalWrite(rgb1_G, HIGH);
  digitalWrite(rgb1_B, LOW);
  
  // rgb2: blue
  digitalWrite(rgb2_R, LOW);
  digitalWrite(rgb2_G, LOW);
  digitalWrite(rgb2_B, HIGH);
  
  // rgb3 remains off
  digitalWrite(rgb3_R, LOW);
  digitalWrite(rgb3_G, LOW);
  digitalWrite(rgb3_B, LOW);
  
  // Bar graph: light up segments 1 and 2
  digitalWrite(bar1, HIGH);
  digitalWrite(bar2, HIGH);
  digitalWrite(bar3, LOW);
  digitalWrite(bar4, LOW);
  
  delay(2000);
  
  // Stage 3 : (4-6 seconds)
  // led1: off
  digitalWrite(led1Pin, LOW);
  
  // rgb1: blue, rgb2: red, rgb3: green
  // rgb1: blue
  digitalWrite(rgb1_R, LOW);
  digitalWrite(rgb1_G, LOW);
  digitalWrite(rgb1_B, HIGH);
  
  // rgb2: red
  digitalWrite(rgb2_R, HIGH);
  digitalWrite(rgb2_G, LOW);
  digitalWrite(rgb2_B, LOW);
  
  // rgb3: green
  digitalWrite(rgb3_R, LOW);
  digitalWrite(rgb3_G, HIGH);
  digitalWrite(rgb3_B, LOW);
  
  // Bar graph: light up segments 1, 2 and 3
  digitalWrite(bar1, HIGH);
  digitalWrite(bar2, HIGH);
  digitalWrite(bar3, HIGH);
  digitalWrite(bar4, LOW);
  
  delay(2000);
  
  // Stage 4 : (6-8 seconds)
  // led1: on
  digitalWrite(led1Pin, HIGH);
  
  // All RGB LEDs: white (all R, G, B on)
  // rgb1 white
  digitalWrite(rgb1_R, HIGH);
  digitalWrite(rgb1_G, HIGH);
  digitalWrite(rgb1_B, HIGH);
  
  // rgb2 white
  digitalWrite(rgb2_R, HIGH);
  digitalWrite(rgb2_G, HIGH);
  digitalWrite(rgb2_B, HIGH);
  
  // rgb3 white
  digitalWrite(rgb3_R, HIGH);
  digitalWrite(rgb3_G, HIGH);
  digitalWrite(rgb3_B, HIGH);
  
  // Bar graph: light up segments 1, 2, 3 and 4
  digitalWrite(bar1, HIGH);
  digitalWrite(bar2, HIGH);
  digitalWrite(bar3, HIGH);
  digitalWrite(bar4, HIGH);
  
  delay(2000);
}