Semaforo

int leds[] = {0,0,0};//altere o valor de acordo com os pinos dos LEDs
int delay_led[] = {0,0,0};//delay de cada LED

int setup(){
    for(int i = 0; i < sizeof(leds)/sizeof(int); i++){
        pinMode(leds[i], OUTPUT);
    }
}
int loop(){
    for(int i = 0; i < sizeof(leds)/sizeof(int); i++){
        digitalWrite(leds[i], HIGH);
        delay(delay_led[i]);
        digitalWrite(leds[i], LOW);
    }
}