byte ledPin = 14;
byte Buzzer = 13;
bool ledState = false;
bool BuzzerState = false;
#include <LiquidCrystal.h>

LiquidCrystal lcd (18, 5, 17, 16, 4, 0);

void setup() {
  Serial.begin(115200);
  Serial.println("Hello");
  pinMode(ledPin, OUTPUT);
  pinMode(Buzzer, OUTPUT);



  lcd.begin(16, 2);
  lcd.print("Type in Serial");
  lcd.setCursor(0, 0);
}

void loop() {
}

void serialEvent() {
  while (Serial.available()) {
    char ch = Serial.read();
    Serial.print(ch);

    if (ch == '0') {
      lcd.clear();
    }
    else if (ch == '1') {
      ledState = !ledState;
      if (ledState)
      {
        digitalWrite(ledPin, HIGH);
        lcd.setCursor(0, 0);
        Serial.println("led on");
        lcd.print("led on");
      }
      else
      {
        digitalWrite(ledPin, LOW);
        Serial.println("led off");
        lcd.print("led off");
      }
    }
    else if (ch == '2') {
       BuzzerState = !BuzzerState;
      if (BuzzerState)
      {
        digitalWrite(Buzzer, HIGH);
        lcd.setCursor(0, 1);
        Serial.println("Buzzer on");
        lcd.print("buzzer on");
      }
      else
      {
        digitalWrite(Buzzer, LOW);
        Serial.println("Buzzer off");
        lcd.print("buzzer off");
      }
    }
    else {
      lcd.print(ch);
    }
  }
}