//blinking LED

const int LED = 13; // LED connected to digital pin 13
              

void setup() 
{
  pinMode(LED, OUTPUT); //sets the digital pin as output
}

void loop() 
{
  digitalWrite(LED, HIGH); //turns the LED on; high = on
  delay(1000);             // waits for a sec, milisecben van megadva
  digitalWrite(LED, LOW);  // turns LED off; low = off = 0 V
  delay(1000);             //waits for a sec
}