WatchDog solution to reset arduino every 4 seconds

gistfile1.txt

#include <avr/wdt.h>

void setup() {
//Reset arduino every 4 seconds WDTO_4S
//https://www.nongnu.org/avr-libc/user-manual/group__avr__watchdog.html#ga9e52c54d10b6a6a7ce04aaaa4abea51f  
wdt_enable(WDTO_4S);
Serial.begin(9600);
}

void loop() {
// wdt_reset(); If you want to reset the timer to zero, just call this function
 for(int i=0; i<=1000; i++){
    Serial.println(i);
    delay(50);
  }
}