#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int potPin = A5;

const int greenLED = 4;
const int yellowLED = 5;
const int redLED = 3;

void setup() {
  pinMode(greenLED, OUTPUT);
  pinMode(yellowLED, OUTPUT);
  pinMode(redLED, OUTPUT);

  lcd.begin(16,2);
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Potentiometer:");
}

void loop() {
  int potValue = analogRead(potPin);

  int percentage = map(potValue, 0, 1023, 0, 100);

  lcd.setCursor(0, 1);
  lcd.print("                ");
  lcd.setCursor(0, 1);
  lcd.print(percentage);
  lcd.print("%");

  if (percentage <= 33) {
    digitalWrite(greenLED, HIGH);
    digitalWrite(yellowLED, LOW);
    digitalWrite(redLED, LOW);
  } else if (percentage > 33 && percentage <= 66) {
    digitalWrite(greenLED, HIGH);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(redLED, LOW);
  } else if (percentage > 66 && percentage < 100) {
    digitalWrite(greenLED, HIGH);
    digitalWrite(yellowLED, HIGH);
    digitalWrite(redLED, HIGH);
  } else if (percentage == 100) {

    for (int i = 0; i < 5; i++) { 
      digitalWrite(greenLED, HIGH);
      digitalWrite(yellowLED, HIGH);
      digitalWrite(redLED, HIGH);
      delay(250); 
      digitalWrite(greenLED, LOW);
      digitalWrite(yellowLED, LOW);
      digitalWrite(redLED, LOW);
      delay(250); 
    }
  }

  delay(100);
}