#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <EEPROM.h>

LiquidCrystal_I2C lcd(0x27, 20, 4); //ถ้าจอไม่แสดงผล ให้ลองเปลี่ยน 0x3F เป็น 0x27
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {24, 22, 23, 25};
byte colPins[COLS] = { 27, 29, 31, 33};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

char key,buff;

void setup() {
  Serial.begin(9600);

  lcd.init();  //lcd.begin();
  lcd.backlight(); // เปิดไฟ backlight
  lcd.setCursor(5, 0);
  lcd.print("Smart Farm");
  lcd.setCursor(4, 1);
  lcd.print("Control Unit");

}
void loop() {



  char key = keypad.getKey();
  if (key != NO_KEY) {
    if (key == 'A')
    {
      EEPROM.write(1, buff);
      Serial.println("Write key to EEPROM(1).");
    } else if (key == 'B'){
      EEPROM.write(2, buff);
      Serial.println("Write key to EEPROM(2).");
    } else if (key == 'C'){
      char X = EEPROM.read(1);
      Serial.print("EEPROM(1) is");
      Serial.println(X);
    } else if (key == 'D'){
      char X = EEPROM.read(2);
      Serial.print("EEPROM(2) is");
      Serial.println(X);
    } else {
      buff = key;
      Serial.println(key);
    }
  }
}