#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);

unsigned long time_timer=millis();
unsigned long task_time_ms=0;

void setup() {
	lcd.begin(16, 2);
	lcd.setCursor(0, 0);
	lcd.print("Contador:");
}

void loop() {
	  lcd.setCursor(10, 0);
  	if((millis()-task_time_ms)>=1000){
  		task_time_ms=millis();
  		lcd.print(((millis()-time_timer)/1000));
  	}
}