int ledpins[8] = {19, 18, 5, 17, 16, 4, 0, 2};
int ledstate=false;
int buzzstate=false;
byte buzzerpin=27;
void setup()
{
 Serial.begin(115200);
 Serial.println("Starting...");
 for(int i=0;i<8;i++)
 {
  pinMode(ledpins[i], OUTPUT);
 }
 pinMode(buzzerpin, OUTPUT);
}
void loop()
{}
void serialEvent()
{
  while (Serial.available()) 
  {
    char ch = Serial.read();
    Serial.print(ch);
    if(ch=='1')
    {
      ledstate=!ledstate;
      if(ledstate)
      {
        for(int i=0;i<8;i++)
        {
          digitalWrite(ledpins[i], HIGH);
        }
      }
      else
      {
        for(int i=0;i<8;i++)
        {
          digitalWrite(ledpins[i], LOW);
        }

      }
    }
    if(ch=='2')
    {
      buzzstate=!buzzstate;
      if(buzzstate)
      {
        digitalWrite(buzzerpin, HIGH);
        Serial.print("Buzzer On");
      }
      else
      {
        digitalWrite(buzzerpin, LOW);
        Serial.print("Buzzer Off");
      }
    }
  }

}