Arduino 3.3

#include <LiquidCrystal.h>

#define DIODE_DROP 0.7

LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

void setup() {

lcd.begin(16, 2);
lcd.print("Btry vltg: ");
String s [20];
for (int i = 1; i <= 20; i++) {
s[i] = i;
}
lcd.setCursor(0, 1);
for(int i = 0; i < 19; i++) {
lcd.print(s[i] + " ");
}
}

void loop() {


float voltage = analogRead(A0) / 1024.0 * 10.0;

if (voltage > 0.1)

voltage += DIODE_DROP;
lcd.setCursor(11, 0);
lcd.print(voltage);
lcd.autoscroll();
delay(500);
}