/*
 * Reset Arduino
 */
#include <avr/wdt.h>  // ***  Watchdog

void McuReset()
{
  wdt_enable(WDTO_4S); // reset can MCU not work 15m, 30m, 2, 4Sec.
  while (1)
  {
  }
}
 

void setup() {
  Serial.begin(115200);
  Serial.println(" We Reset MCU");
  //delay(500);
  wdt_enable(WDTO_4S); 
}

void loop() {
  for (int i=9;i>=0;i--) {
    Serial.print(i);
    delay(500); // *****
  }
  //McuReset();
  wdt_reset(); // ***
  Serial.println(" Not print is 'Reset'");
}