#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(115200);
  pinMode(A0, INPUT);   
  pinMode(7, OUTPUT);    
  pinMode(6, OUTPUT); 
  pinMode(5, OUTPUT); 
  pinMode(4, OUTPUT);            
}

void loop() {
  int pot = analogRead(A0);
  int pot1 = map(pot, 0, 1023, 0, 100);
  
  if (pot1 == 0) { 
    digitalWrite(7, HIGH);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    lcd.setCursor(1, 0);
    lcd.print("led1");
    delay(500);
  }
  else if (pot1 >= 30 && pot1 < 60) { 
    digitalWrite(6, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    digitalWrite(7, LOW);
    lcd.setCursor(7, 1);
    lcd.print("led2");
    delay(500);
  } 
  else if (pot1 >= 60 && pot1 < 100) {
    digitalWrite(5, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    lcd.setCursor(7, 1);
    lcd.print("led3");
    delay(500);
  } 
  else if (pot1 == 100) {
    digitalWrite(4, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    lcd.setCursor(7, 1);
    lcd.print("led4");
    delay(500);
  } 
  else {
    digitalWrite(7, LOW);
    digitalWrite(6, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
    lcd.clear();
    delay(500);
  }

  lcd.setCursor(0, 0);
  lcd.print(pot1);
  Serial.println(pot);
  delay(500);
}