#include <LiquidCrystal.h>
LiquidCrystal lcd(4,16,17,5,18,19);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(21, OUTPUT);
  lcd.begin(16,2);

  Serial.println("\t\t\tWelcome");
  Serial.println("Please enter your text and press enter ");
  delay(1000);
  
}

String state;

void loop() {
  lcd.clear();
  if(Serial.available()){
    state = Serial.readStringUntil('\n');
  }
  // for(int i = 0; i < state.length(); i++){
  //   lcd.print(state[i]);
  // }
  lcd.print(state);
  if(state == "ON"){
    Serial.println(state);
    digitalWrite(21,HIGH);
  }else if(state == "OFF"){
    Serial.println(state);
    digitalWrite(21,LOW);
  }
  delay(1000);
}