Besoin d'aide en programmation

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


LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); 


int pushButton = 2;
int pinPot=0;
int valPot=0;
const float COEFDIV=(120/(120+470)); 

void setup()
{

  lcd.begin(16,2);




  lcd.setCursor(0,0);
  lcd.print("");
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("");
  delay(3000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("");
  lcd.setCursor(0,1);
  lcd.print("");
  delay(3000);
  lcd.clear();   

  Serial.begin(9600);
  pinMode(12, OUTPUT);
pinMode(A1, INPUT);
}

void loop()  
{
 int value = analogRead(A1);
 
int  Vin = value/COEFDIV ;

  valPot=analogRead(A0); 
  Serial.print("Valeur lue : ");
  Serial.println(valPot);
lcd.setCursor(8,2);
lcd.print( valPot); 
lcd.print( "   ");
delay(0);
   
  if ( valPot < 300){

digitalWrite(12, HIGH);  
  delay(10);
  }
   
   if ( valPot > 300){
  digitalWrite(12, LOW);
  }
}