// morse code blink
#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>

// Pin 13 has an LED connected on most Arduino boards.
// Pin 11 has the LED on Teensy 2.0
// Pin 6  has the LED on Teensy++ 2.0
// Pin 13 has the LED on Teensy 3.0
// Pin 7 has the LED oh Fabacademy hello-world
// give it a name:

const int led = 7;
// int main () {

void setup() {
  
  pinMode(led, OUTPUT);
 
  /* actual initialization */
  int a = 250;
  int b = 500;
  int c = 50;

  pinMode(led, OUTPUT);
}

void loop() {

      int a = 250;
      int b = 500;
      int c = 50;
      int d = 50;
      
for ( c = 50; c < 500; c = c + 100 ) {  

       a = a + c;
       printf("a = ", a);
       b = b + c;
       printf("b = ", b);
       
      digitalWrite(led, HIGH);
      delay(a);
      digitalWrite(led, LOW);
      delay(d);
      digitalWrite(led, HIGH);
      delay(a);
      digitalWrite(led, LOW);
      delay(d);
      digitalWrite(led, HIGH);
      delay(a);
      digitalWrite(led, LOW);
      delay(d);
      digitalWrite(led, HIGH);
      delay(b);
      digitalWrite(led, LOW);
      delay(d);
      digitalWrite(led, HIGH);
      delay(b);
      digitalWrite(led, LOW);
      delay(d);
      digitalWrite(led, HIGH);
      delay(b);
      digitalWrite(led, LOW);
      delay(d);
     }
}