//https://docs.wokwi.com/parts/wokwi-lcd1602
//https://wokwi.com/projects/344891772964438612
//LiquidCrystal I2C Hello World  program


#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16 //20
#define LCD_LINES   4 // 2

#define col0 0
#define row0 0
#define row1 1

#define rightColumnPosition15 15 // ตำแหน่งขวามือสุดคือ ตำแหน่ง 15
#define lefColumnPosition0 0 // ตำแหน่งซ้ายมือสุดคือ ตำแหน่ง 0
#define dly100 100

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);  // lcd เป็นชื่อเล่น

char* msg ="Hello";
char* msgW ="World";
void setup() {
  Serial.begin(115200);
  // Init
  lcd.init();
  lcd.backlight();

}
//---  left to right
void leftTOright(char* H){
 for (int x=lefColumnPosition0; x<=rightColumnPosition15; x++) {  // left to right
    lcd.setCursor(x, row0);
    lcd.print(H);
    delay(dly100);
    lcd.clear();
  }
}
//---  right to left
void rightTOleft(char* H) {
  for (int x=rightColumnPosition15; x>=lefColumnPosition0; x--) {  // right to left
    lcd.setCursor(x, row0);
    lcd.print(H);
    delay(dly100);
    lcd.clear();
  }
}
//---

void loop() {

  //lcd.setCursor(0, 0);
  //lcd.print("Hello, world!");
  leftTOright(msg);
  rightTOleft(msgW);
  
}
//  end program