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

#define ROW_NUM     4 // four rows
#define COLUMN_NUM  4 // four columns

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};

byte pin_rows[ROW_NUM]      = {19, 18, 5, 17}; 
byte pin_column[COLUMN_NUM] = {16, 4, 2, 15};  

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 16 column and 2 rows

int cursorColumn = 0;
int direct = 27;
int step = 12;


void setup(){
  lcd.init(); // initialize the lcd
  lcd.backlight();
  pinMode(step ,OUTPUT);
  pinMode(direct ,OUTPUT);
}

void loop(){
  char key = keypad.getKey();

  
  switch (key) {
  case '1':
    lcd.clear();
    lcd.setCursor(0, 0); // move cursor to   (cursorColumn, 0)
    lcd.print("keypad = ");
    lcd.print(key);
    lcd.setCursor(0, 2); // move cursor to   (cursorColumn, 0)
    lcd.print("Kruncharoen");
    digitalWrite(direct, HIGH);
    digitalWrite(step, HIGH);
    delay(100);
    digitalWrite(step, LOW);
    break;
  case '2':
    lcd.clear();
    lcd.setCursor(0, 0); // move cursor to   (cursorColumn, 0)
    lcd.print("keypad = ");
    lcd.print(key);
    lcd.setCursor(0, 2); // move cursor to   (cursorColumn, 0)
    lcd.print("Electronic");
    digitalWrite(direct, LOW);
    digitalWrite(step, HIGH);
    delay(100);
    digitalWrite(step, LOW);
    break;
  case '3':
     lcd.clear();
    lcd.setCursor(0, 0); // move cursor to   (cursorColumn, 0)
    lcd.print("keypad = ");
    lcd.print(key);
    lcd.setCursor(0, 2); // move cursor to   (cursorColumn, 0)
    lcd.print("Electronic");
    for (int i = 1; i <= 100; i++) {
      digitalWrite(direct, HIGH);
      digitalWrite(step, HIGH);
      delay(10);
      digitalWrite(step, LOW);
    }
    break;
    case 'A':
     lcd.clear();
    lcd.setCursor(0, 0); // move cursor to   (cursorColumn, 0)
    lcd.print("keypad = ");
    lcd.print(key);
    lcd.setCursor(0, 2); // move cursor to   (cursorColumn, 0)
    lcd.print("Oh No");
    for (int i = 1; i <= 200; i++) {
      digitalWrite(direct, HIGH);
      digitalWrite(step, HIGH);
      delay(10);
      digitalWrite(step, LOW);
    }
    break;
    case 'C':
    lcd.clear();
    lcd.setCursor(0, 0); // move cursor to   (cursorColumn, 0)
    lcd.print("keypad = ");
    lcd.print(key);
    lcd.setCursor(0, 2); // move cursor to   (cursorColumn, 0)
    lcd.print("Electronic");
    for (int i = 1; i <= 200; i++) {
      digitalWrite(direct, LOW);
      digitalWrite(step, HIGH);
      delay(10);
      digitalWrite(step, LOW);
    }
    break;
    }
  
}