#include "Arduino.h"
// prototypes
void blink(int n, int d);

// variables
int ledPin = 13; // LED connected to digital pin 13


void setup(){
    Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
    pinMode(ledPin, OUTPUT);      // sets the digital pin as output
    Serial.println("------------------");
    Serial.println("   hello world");
    Serial.println("------------------");
}

void loop(){

  blink(3, 50); // blink led (n times, ms interval)
  delay(1000); // wait 1 sec
}


void blink(int n, int d){
  for (int i=0; i<n; i++) {
    digitalWrite(ledPin, HIGH);
    delay(d/2);
    digitalWrite(ledPin, LOW);
    delay(d/2);
  }
}

int main(void)
{
    init();

    setup();

    for (;;)
        loop();

    return 0;
}