// Define pin connections
const int led1Pin = 2;      // LED 1 connected to digital pin 2
const int led2Pin = 3;      // LED 2 connected to digital pin 3
const int led3Pin = 4;      // LED 3 connected to digital pin 4
const int rgbRedPin = 9;    // RGB LED red channel connected to PWM pin 9
const int rgbGreenPin = 10; // RGB LED green channel connected to PWM pin 10
const int rgbBluePin = 11;  // RGB LED blue channel connected to PWM pin 11
const int potPin = A0;      // Potentiometer connected to analog pin A0

// Define threshold values for the potentiometer
const int lowerThreshold = 341;
const int upperThreshold = 682;

void setup() {
  // Initialize LED pins as outputs
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(rgbRedPin, OUTPUT);
  pinMode(rgbGreenPin, OUTPUT);
  pinMode(rgbBluePin, OUTPUT);
  
  // Initialize all LEDs as off
  digitalWrite(led1Pin, LOW);
  digitalWrite(led2Pin, LOW);
  digitalWrite(led3Pin, LOW);
  analogWrite(rgbRedPin, 0);
  analogWrite(rgbGreenPin, 0);
  analogWrite(rgbBluePin, 0);
}

void loop() {
  // Read the potentiometer value
  int potValue = analogRead(potPin);
  
  // Determine which LED should be on and RGB color based on potentiometer value
  if (potValue <= lowerThreshold) {
    // Lower third: LED 1 on, RGB LED shows red
    digitalWrite(led1Pin, HIGH);
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, LOW);
    
    // Map potentiometer value within the lower third to red brightness
    int redBrightness = map(potValue, 0, lowerThreshold, 0, 255);
    analogWrite(rgbRedPin, redBrightness);
    analogWrite(rgbGreenPin, 0);
    analogWrite(rgbBluePin, 0);
  } 
  else if (potValue <= upperThreshold) {
    // Middle third: LED 2 on, RGB LED shows green
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, HIGH);
    digitalWrite(led3Pin, LOW);
    
    // Map potentiometer value within the middle third to green brightness
    int greenBrightness = map(potValue, lowerThreshold + 1, upperThreshold, 0, 255);
    analogWrite(rgbRedPin, 0);
    analogWrite(rgbGreenPin, greenBrightness);
    analogWrite(rgbBluePin, 0);
  } 
  else {
    // Upper third: LED 3 on, RGB LED shows blue
    digitalWrite(led1Pin, LOW);
    digitalWrite(led2Pin, LOW);
    digitalWrite(led3Pin, HIGH);
    
    // Map potentiometer value within the upper third to blue brightness
    int blueBrightness = map(potValue, upperThreshold + 1, 1023, 0, 255);
    analogWrite(rgbRedPin, 0);
    analogWrite(rgbGreenPin, 0);
    analogWrite(rgbBluePin, blueBrightness);
  }
  
  // Small delay for stability
  delay(10);
}