// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);

  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);

  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);

  pinMode(A0, OUTPUT);
  pinMode(A1, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(A3, OUTPUT);
  digitalWrite(A1, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for a second

  digitalWrite(3, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(3, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for a second

  digitalWrite(5, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(5, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for a second


  digitalWrite(A0, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(A0, HIGH);    // turn the LED off by making the voltage LOW
  delay(100);

 digitalWrite(A1, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(A1, HIGH);    // turn the LED off by making the voltage LOW
  delay(100);

   digitalWrite(A2, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(A2, HIGH);    // turn the LED off by making the voltage LOW
  delay(100);


  digitalWrite(A3, LOW);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(A3, HIGH);    // turn the LED off by making the voltage LOW
  delay(100);
}