#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Keypad.h>
LiquidCrystal_I2C lcd(0x27, A4, A5);
/*char keys[4][4] = {
  {'1', '2', '3', 'A' },
  {'4', '5', '6', 'B' },
  {'7', '8', '9', 'C' },
  {'*', '0', '#', 'D' }
};
byte rowPins[4] = {2, 3, 4, 5};
byte colPins[4] = {8, 9, 10, 11};
Keypad keypad_key = Keypad( makeKeymap(keys), rowPins, colPins, 4, 4);
*/
char keys[4][4] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
uint8_t colPins[4] = { 8, 9, 10, 11 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[4] = { 2, 3, 4, 5 }; // Pins connected to R1, R2, R3, R4
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, 4, 4);

int m,i=0; 
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
lcd.begin (16,2);
delay(300);
lcd.setCursor(2,0);
lcd.print("CYPHER");
}

void loop() {
//char key = keypad_key.getKey();
char key = keypad.getKey();
if (key!= NO_KEY){
  m++;
  lcd.backlight();
  lcd.setCursor(2, 0);
  //lcd.print("False");
  if(m==1&key=='1'){
    i++;
    lcd.print("1Right");
  }
  else if(m==2&key=='2'){
    i++;
    lcd.print("2Right"); 
  }
  else if(m==3&key=='3'){
    i++;
    lcd.print("3Right");
  }
  else if(m==4&key=='4'){
    i++;
    lcd.print("4Right");
  }
  else if(m==5&key=='5'){
    i++;
    lcd.print("5Right");  
  }
  else if(m==6&key=='6'){
    i++;
    lcd.print("6Right");  
  }
  else if(m==7&i==6){
    lcd.backlight();
    lcd.setCursor(2, 0);
    lcd.clear();
    lcd.print("Ture");
    delay(3000);
    lcd.setCursor(2,0);
    lcd.clear();
    lcd.print("Hello World!!!");
    m=0;
    i=0;
    lcd.noBacklight();
  }
  else{
    i=0;
  }
  if(m>=7&i!=6){
    m=0;
    i=0;
    lcd.clear();
    lcd.print("Rong");
    lcd.clear();
    lcd.print("Re input!");
    delay(3000);
    lcd.clear();
  //  lcd.noBacklight();
    }
  

}

}