#include <Keypad.h>
#include <TM1637.h>

const int CLK = 10;
const int DIO = 11;
#include <Servo.h>

Servo myservo;  
TM1637 tm(CLK, DIO);
const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
int buzzer1=13;
void setup() 
{
  Serial.begin(9600);
  tm.init();
  tm.set(BRIGHT_TYPICAL);
  myservo.attach(12);
  pinMode(buzzer1, OUTPUT);
}
char passkey[4]={'5','6','6','2'};
int flag=0;
void loop() 
{
  myservo.write(0);
  char key;
  while(flag<=3)
  {
    key=keypad.getKey();
    if (key != NO_KEY) 
    {
      if(key=='A')
      {
        flag=0;
        tm.display(0,'_');
        tm.display(1,'_');
        tm.display(2,'_');
        tm.display(3,'_');
        continue;
      }
      if(key==passkey[flag])
      {
        shownum(flag, key);
        flag++;
      }
      else
      {
        tone(buzzer1,100);
        flag=0;
        tm.display(0,'_');
        tm.display(1,'_');
        tm.display(2,'_');
        tm.display(3,'_');
        delay(500);
        noTone(buzzer1);
        continue;
      }
    }
  }
  key=keypad.getKey();
  if(key=='D')
  {
    flag++;
  }
  if(flag==5)
  {
    tone(buzzer1,800);
    delay(200);
    tone(buzzer1,1800);
    delay(300);
    noTone(buzzer1);
    myservo.write(90);
    delay(2000);
    myservo.write(0);
    tm.display(0,'_');
    tm.display(1,'_');
    tm.display(2,'_');
    tm.display(3,'_');
    flag=0;
  }
}
char numkey[10]={'0','1','2','3','4','5','6','7','8','9'};
void shownum(int n,char key)
{
  for(int i=0;i<=9;i++)
  {
    if(key==numkey[i])
    {
      tm.display(n,i);
    }
  }
}