#include<LiquidCrystal.h>

LiquidCrystal lcd(2,3,4,5,6,7);   //rs,e,d4,d5,d6,d7

int Vin=5;        
float Vout=0;     
float R1=3300;    
float R2=0;       

int a2d_data=0;    
float buffer=0;            

void setup()
{
  lcd.begin(16,2);
}

void loop()
{
  a2d_data=analogRead(A0);
  if(a2d_data)
  {
    buffer=a2d_data*Vin;
    Vout=(buffer)/1024.0;
    buffer=Vout/(Vin-Vout); 
    R2=R1*buffer;

    lcd.setCursor(4,0);
    lcd.print("ohm meter");

    lcd.setCursor(0,1);
    lcd.print("R (ohm) = ");
    lcd.print(R2);
    
    delay(1000);
  }
}