#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
#define Analogpin(A0)
float R1 = 1000;
float R2 = 10000;
void setup(){
  lcd.begin(16, 2);
  lcd.print("DC VOLTMETER");
  Serial.begin(9600);
}
void loop(){
  int value = analogRead(A0);
  float vout = (value / 1023 * 5);
  float vin = vout / (R2 / (R1 + R2));
  lcd.setCursor(0, 1);
  lcd.print("INPUT V= ");
  lcd.print(vin);
  Serial.println(vin);
  delay(500);
}