#include <wiringPi.h>

#define PIN_CH0 8  // PIN 3
#define PIN_CH1 9  // PIN 5
#define PIN_CH2 7  // PIN 7
#define PIN_CH3 15 // PIN 8

static int pins[] = {PIN_CH0, PIN_CH1, PIN_CH2, PIN_CH3};
static int pins_len = 4;

int main(void){
	wiringPiSetup();

	for(int i = 0; i < pins_len; i++) {
		pinMode(pins[i], OUTPUT);
		digitalWrite(pins[i], LOW);
		delay(1000);
		digitalWrite(pins[i], HIGH);
	}

	return 0;
}