/* This is the code for testing the Arduino keyboard, ELECTRONOOBS 21/08/2019
 *  Tutorial: https://electronoobs.com/eng_arduino_tut103.php
 *  Schematic: https://electronoobs.com/eng_arduino_tut103_sch2.php
 *  Code: https://electronoobs.com/eng_arduino_tut103_code2.php  
 *  YouTube channel: https://www.youtube.com/channel/UCjiVhIvGmRZixSzupD0sS9Q
 * 
 *  Connect Rx and Tx to any other microcontroller and use serial at 115200 bauds.*/
 
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3f,20,4);   //sometimes the LCD adress 0x3f and sometimes is 0x27. Try both. 



void setup() {
  lcd.init();                 //Init the LCD
  lcd.backlight();            //Activate backlight 
  Serial.begin(115200);       //Must be the same as the keyboard
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Push any key!");
}

void loop() {
  if(Serial.available() > 0)
  {
    char RECEIVED = Serial.read();
    //String text = String(RECEIVED);
    if(RECEIVED == '{')
    {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("SEND");
    }
    else if(RECEIVED == '}')
    {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("OK");
    }
    else if(RECEIVED == '^')
    {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("RETURN");
    }
    else
    {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.write(RECEIVED);
    //delay(10);
    }
  }
 }