#include <LiquidCrystal.h>

//assign pin
#define TX_DATA 17
#define RS_PIN 8
#define E_PIN 9
#define LCD_4 4
#define LCD_5 5
#define LCD_6 6
#define LCD_7 7

//sending speed 5 bit per sec
#define TX_RATE 5

//Message to send
const char *message = "Hello World";

void setup() {
  pinMode(TX_DATA, OUTPUT);

  LiquidCrystal lcd(RS_PIN, E_PIN, LCD_4, LCD_5, LCD_6, LCD_7);
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print(message);

  for(int byte_idx = 0; byte_idx < strlen(message); byte_idx++) {
    //get the one char at the tick from message
    char tx_byte = message[byte_idx];

    //clear the second line
    lcd.noCursor();
    lcd.setCursor(0, 1);
    lcd.print("        ");
    lcd.setCursor(byte_idx, 0);
    lcd.cursor();

    for(int bit_idx = 0; bit_idx < 8; bit_idx++) {
      //and oparetion byte with each bit to send the data of each bit
      bool tx_bit = tx_byte & (0x80 >> bit_idx);

      digitalWrite(TX_DATA, tx_bit);

      //update LCD
      lcd.noCursor();
      lcd.setCursor(bit_idx, 1);
      lcd.print(tx_bit ? "1" : "0");
      lcd.setCursor(byte_idx, 0);
      lcd.cursor();

      delay(1000/TX_RATE);
    }
  }
}

void loop() {
}