#include <avr/wdt.h>





void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  Serial.println("Start programu");
  wdt_enable(WDTO_2S);
  delay(500);
  pinMode(5, OUTPUT);
  digitalWrite(5, 1);

}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("loop jede");
  wdt_reset();
  while (1) {
    if (millis() < 4000) {
      wdt_reset();
    }
    else{
      digitalWrite(5,0);
    }
  }
}