#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16,2);

void setup() {
  // put your setup code here, to run once:
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(A0, INPUT);
Serial.begin(9600);

lcd.init();
lcd.backlight();
}

void loop() {
  // put your main code here, to run repeatedly:
int i = analogRead(A0);
int a = map(i, 0, 1023, 0, 100);

  if (a >= 0 && a <= 33  ) {
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
  } else if(a >= 34 && a <= 66) {                    
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
  }
   else if(a >= 67 && a <= 99) {    
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
  } else{                    
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    delay(100);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
  }
  lcd.clear();
lcd.setCursor(0,0);
lcd.print(a);
lcd.print("%");
delay(100);
}