#include "pitches.h"

int melody[] = {
  NOTE_G4, NOTE_C6};


void setup() {
  // put your setup code here, to run once:
  /*delay(1000);
  tone(6, melody[0], 200);
  delay(1000);
  tone(6, melody[0], 200);
  delay(1000);
  tone(6, melody[1], 100);*/
  pinMode(A0,OUTPUT);
  pinMode(A1,OUTPUT);
  pinMode(A2,OUTPUT);
  pinMode(A3,OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int pins[] = {A0, A1, A2, A3};
  for(int i=0;i<4;i++){
    Serial.println(i, pins[i]);
    digitalWrite(pins[i], HIGH);
    delay(500);
    digitalWrite(pins[i], LOW);
    delay(500);
  }
}