text: #include <stdio.h>
  #include <wiringPi.h>
  
  int led = 1;
  
  int main(void){
  
  	if(wiringPiSetup() == -1)
  		return 0;
  
  	pinMode(led,OUTPUT);
  
  	while(1){
  		digitalWrite(led,1);
  		delay(500);
  
  		digitalWrite(led,0);
  		delay(500);
  	}
  	return 1;
  }
  