// EXPERIMENT 1.7
/*
int input;
int arr[] = {0,1,2,3};
void setup() {
  for (int i = 0; i < 4; i++){
  pinMode(arr[i], OUTPUT);
}
  Serial1.begin(115200);
  Serial1.println("Which LED FROM 1,2,3,4?");
}

void loop() {
  input = Serial.parseInt();
  if (input != 0){
    digitalWrite(arr[input-1], HIGH);
    delay(500);
    digitalWrite(arr[input-1], LOW);
  } 
  else 
  {
    for (int i = 0; i < 3; i++)
    {
      digitalWrite(arr[i], LOW);
    }
  }
}
*/

//EXPERIMENT 1.8
 void setup(){
	for (int i = 0; i < 4; i++){
		pinMode(i,OUTPUT);
	}
}

void blink(int i, int j){
	digitalWrite(i,HIGH);
	digitalWrite(j,HIGH);

	delay(500);

	digitalWrite(i,LOW);
	digitalWrite(j,LOW);
}

void loop (){
	blink(0,1);
	delay(3000);
	blink(2,3);
	delay(5000);
}