#define BUTTON_PIN A0
#define LED_PIN 12
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lsd( 0x27 , 16, 2);

void setup() {
pinMode(LED_PIN, OUTPUT);
pinMode(BUTTON_PIN, INPUT_PULLUP);
lsd.begin(16, 2);
lsd.backlight();
lsd.setCursor(2,0);
lsd.print("Hello world!");
delay(2000);
lsd.clear();
}

void loop() {
bool butt = digitalRead(BUTTON_PIN);
if(butt == 1){
digitalWrite(LED_PIN, LOW);
lsd.setCursor(7,0);
lsd.print("0");
}
else{
digitalWrite(LED_PIN, HIGH);
lsd.setCursor(7,0);
lsd.print("1");
}

}