const int dimLed = 4;
int pinLed[dimLed] = {10,11,12,13};     // crea un array di pin di output per il LED
char j;
int k;

void setup()
{
  for(int i = 0; i < dimLed; i++)
  {
    pinMode(pinLed[i], OUTPUT);            // dichiara il LED come output    // abilita la resistenza di pull-up

   } 
  Serial.begin(9600);
  Serial.print("accensione led");
}

void loop(){
  
    if (Serial.available() > 0) {
    char j = Serial.read();                             // controlla se il pulsante è premuto
      switch(j){
        case '0':
        k = 0;
        blink1(pinLed[k]);
        break;
        case '1': 
        k = 1;   
        blink2(pinLed[k]);
        break;  
        case '2': 
        k = 2;   
        blink3(pinLed[k]);
        break; 
        case '3':
        k= 3;   
        blink4(pinLed[k]);
        break;
        //default:
        //break;  
      }  
    }
    else
    {
      digitalWrite(pinLed[k], LOW);          // spegne il LED
    }
}
void blink1 (int led){
  digitalWrite(led,HIGH);
  delay(50);
  digitalWrite(led,LOW);
  delay(50);
  }
  void blink2 (int led){
  digitalWrite(led,HIGH);
  delay(100);
  digitalWrite(led,LOW);
  delay(100);
  }
  void blink3 (int led){
  digitalWrite(led,HIGH);
  delay(150);
  digitalWrite(led,LOW);
  delay(150);
  }
   void blink4 (int led){
  digitalWrite(led,HIGH);
  delay(200);
  digitalWrite(led,LOW);
  delay(200);
  }