Controlling 16*2 LCD display via smartphone using arduino

#include <LiquidCrystal.h>


const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  
  lcd.begin(16, 2);

  Serial.begin(9600);
}

void loop() {
 
  if (Serial.available()) {
    
    delay(100);

    lcd.clear();
    
    while (Serial.available() > 0) {
      
      lcd.write(Serial.read());
    }
  }
}