//for help look at: https://github.com/Starmbi/hp_BH1750/wiki
#include <Arduino.h>
#include <Wire.h>

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


int led1 = 2; 
int PWM_Pin = 3;      //LED được kết nối với chân số 3 của Arduino
const int ROW_NUM    = 4; // four rows
const int 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] = {13, 12, 11, 10};      // connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {9, 8, 7, 6}; // connect to the column pinouts of the keypad
char key;
byte menu = 0;
int sensor = 5;
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{
  // put your setup code here, to run once:
pinMode(led1, OUTPUT);
      pinMode(PWM_Pin,OUTPUT);  //Khai báo chân nối LED là chân ngõ ra
  Serial.begin(9600);
    Wire.begin();
        lcd.init();
  lcd.backlight();
   
  
                                          
  }


void loop()
{
  if (menu == 0) batdau();
  else if (menu == 1) tudong();
  else if (menu == 2) thucong();
}

void batdau()
{
lcd.setCursor(0,0);
lcd.print("Vui long chon");
lcd.setCursor(0,1);
lcd.print("che do");
key = keypad.getKey();
 if (key == '*'){
    menu = 1;
    lcd.clear();
 }
   else if(key == '#'){
    menu = 2;
    lcd.clear();
    lcd.setCursor(0, 0);
lcd.print("An A de mo den");
 lcd.setCursor(0, 1);
lcd.print("An B de tat den");
 analogWrite(PWM_Pin,0);
  }
}

void tudong()
{

  
  

  if(digitalRead(sensor)==HIGH)
  {

      Serial.println("100 % PWM");

  digitalWrite(led1,HIGH);
lcd.setCursor(0, 1);
lcd.print("Den dang bat");
      analogWrite(PWM_Pin,127);
  }
  
  else
     { 
digitalWrite(led1,LOW);
Serial.println("0 % PWM");
lcd.setCursor(0, 1);
lcd.print("Den dang tat");
        analogWrite(PWM_Pin,0);
}

    key = keypad.getKey();
   if(key == '#'){
    menu = 2;
    lcd.clear();
     lcd.setCursor(0, 0);
lcd.print("An A de mo den");
 lcd.setCursor(0, 1);
lcd.print("An B de tat den");
 analogWrite(PWM_Pin,0);
}
}

void thucong()
{
   key = keypad.getKey();
  if(key == 'A'){
        lcd.clear();
        digitalWrite(led1,HIGH);
    Serial.println("100 % PWM");
  analogWrite(PWM_Pin,127);
  
lcd.setCursor(0, 0);
lcd.print("Den dang bat");
  }
  else if (key == 'B'){
        lcd.clear();
        digitalWrite(led1,LOW);
        Serial.println("0 % PWM");
    analogWrite(PWM_Pin,0);
      
lcd.setCursor(0, 0);
lcd.print("Den dang tat");
  }
  else if (key == '*'){
    menu = 1;
    lcd.clear();
}
}