#include <wiringPi.h>
 
int main( int argc, char** argv )
{
 
  if( wiringPiSetup() == -1 )
    return 1;
 
  pinMode( 1, OUTPUT ); // BCM GPIO pin 18

  int i = 0;

  while( 1 )
  {
    digitalWrite( 1, 0 );
    delay( i );               
    digitalWrite( 1, 1 );
    delay( i );
    i = ( i == 200 ) ? 0 : i + 10;
  }

  return 0 ;

}