#include<wiringPi.h>
#define LED_ON 1
#define LED_OFF 0
const int Led[16]={4,17,18,27,22,23,24,25,6,12,13,16,19,20,26,21};

void LEDControl(int pinnum){
	int i;
	for(i=0;i<16;i++){
		if(i==pinnum || i==pinnum+1) 
			digitalWrite(Led[i],LED_ON);
		else 
			digitalWrite(Led[i],LED_OFF);
	}
}

int main(void){
	int i;
	if(wiringPiSetupGpio()==-1) 
		return 1;
	for(i=0;i<16;i++){
		pinMode(Led[i],OUTPUT);
		digitalWrite(Led[i],LED_OFF);
	}
	while(1){
		for(i=0;i<16;i+=2){
			LEDControl(i);
			delay(500);
		}
	}
	return 0;
}