//Coding the same MORSE Code SOS program using C instead of Sketch

#include <avr/io.h> // header file file for input output pins
#include <util/delay.h> // header file for delay.
#define led 4

void setup()
{
 DDRB |= (1<< led);
}

 void loop()
{
  //Three long blink
  PORTB |= (1<< led);
  _delay_ms(1000);
  PORTB &= ~(1<< led);
  _delay_ms(200); 
  PORTB |= (1<< led);
  _delay_ms(1000);
  PORTB &= ~(1<< led);
   _delay_ms(200);
  PORTB |= (1<< led);
  _delay_ms(1000);
  PORTB &= ~(1<< led);
  _delay_ms(200); 

   //Three short blinks
  PORTB |= (1<< led);
  _delay_ms(400);
  PORTB &= ~(1<< led);
  _delay_ms(200);
  PORTB |= (1<< led);
  _delay_ms(400);
  PORTB &= ~(1<< led);
  _delay_ms(200);
  PORTB |= (1<< led);
  _delay_ms(400);
  PORTB &= ~(1<< led);
  _delay_ms(200);           
   }