int led1 = 13;
int led2 = 11;
int led3 = 9;


void setup() {
  Serial.begin(9600);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  if(Serial.available()){
    char led_char = Serial.read();
    int led_num = led_char - '0'; // Convert from ASCII to integer

    if(led_num == 1){
      digitalWrite(led1, HIGH);
      delay(2000);
      digitalWrite(led1, LOW);
    }
    if(led_num == 2){
      digitalWrite(led2, HIGH);
      delay(2000);
      digitalWrite(led2, LOW);
    }
    if(led_num == 3){
      digitalWrite(led3, HIGH);
      delay(2000);
      digitalWrite(led3, LOW);
    }
  }
}