#include <Adafruit_LiquidCrystal.h>

int seconds = 0;

Adafruit_LiquidCrystal lcd_1(0);

void setup()
{
  lcd_1.begin(16, 2);

  lcd_1.print("hello world");
}

void loop()
{
  lcd_1.setCursor(0, 1);
  lcd_1.print(seconds);
  lcd_1.setBacklight(1);
  delay(500); 
  lcd_1.setBacklight(0);
  delay(500); 
  seconds += 1;
}