 
 void enterSleep()
 {
+  power_usart0_disable();// Serial (USART) 
+
   sleep_enable();
 
   attachInterrupt(0, pinInterrupt, RISING);


int logData() {
  String year, month, day, hour, minute, second;
  DateTime datetime = RTC.now();
  year = String(datetime.year(), DEC);
  month = String(datetime.month(), DEC);

  /* The program will continue from here after the WDT timeout*/
  sleep_disable(); /* First thing to do is disable sleep. */

  /* Re-enable the serial. */
  power_usart0_enable();
}

// Send the clear display command (0x76)
