#include <LiquidCrystal.h> //include lcd library
#define MAX_MESSAGE_LENGTH 64 //define max message length
LiquidCrystal lcd(12, 11, 10, 9, 8, 7); //initialize lcd

String messageString; //define output String

void setup() {
  Serial.begin(9600); 
  lcd.begin(16, 2);
  pinMode(2, INPUT_PULLUP);
  lcd.setCursor(0,0);
  digitalWrite(13, HIGH);
}

void loop() {
  if(Serial.available()){ //if there is something in the serial buffer
    
    messageString = Serial.readStringUntil('\n');
    int hexValue = strtol(messageString.c_str(), NULL, 16);
    char character = (char)hexValue;
    Serial.print(character);
    lcd.print(character); //print the message
    messageString = "";
    delay(100);
  }

  if(digitalRead(2) == LOW){
    lcd.clear();
  }
}