Arduino nano script for BetterDamage

#define shockPin 2
#define vibroPin 3
#define powerUpPin 4
#define powerDownPin 5

void setup()
{
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200) ;
  Serial.setTimeout(5);
}

void mark_click(int pin){
  digitalWrite(pin, HIGH);
   delay(90);
   digitalWrite(pin, LOW);
}
void loop()
{
  if(Serial.available()>1){
    char  key = Serial.read();
    int val = Serial.parseInt();
    switch (key){
      case 's': mark_click(shockPin);
        delay(100);
            break;
      case 'v': mark_click(vibroPin);
        delay(100);
        break;
      case 'u': mark_click(powerUpPin);
        break;
      case 'd': mark_click(powerDownPin);
        break;
    }
  }
}