#include <stdio.h>
#include <string.h>

int sputc(char __c, FILE *__f)
{
  if(__f == stderr)
  {
    Serial.write(__c);
  }
  else 
  {
    Serial.write(__c);
  }
  return __c;
}

int sputs(const char* __str)
{
  for(int i = 0; i < strlen(__str); i++)
  {
    sputc(__str[i], stdout);
  }
}

char sgetc()
{
  return Serial.read();
}

void stdio_init_all(unsigned long baud = 9600)
{
  Serial.begin(baud);
  fdevopen(&sputc, &sgetc); 
}
void setup() 
{
  stdio_init_all();
  printf("%s\n","Hello, World from Arduino!");
  pinMode(13, 1);
}

void loop() {
  digitalWrite(13, 1);
  printf("%s\n", "ON");
  _delay_ms(1000);
  digitalWrite(13, 0);
  printf("%s\n", "OFF");
  _delay_ms(1000);
}