#define servo_pin 23
#include<ESP32Servo.h>
Servo servo;
#include <Keypad.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]      = {22, 21, 19, 18}; // GPIO19, GPIO18, GPIO5, GPIO17 connect to the row pins
byte pin_column[COLUMN_NUM] = {5, 17, 16, 4};   // GPIO16, GPIO4, GPIO0, GPIO2 connect to the column pins
 
Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
String password="1234";
 
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  servo.attach(servo_pin);
  servo.write(0);
}
 
void loop()
{
  char key=keypad.getKey();
  if (key!=NO_KEY)
    {
      Serial.print(key);
      checkPassword(key);
    }
  delay(50);
}//end of loop
 
void open()
{
  for(int i=0; i<=180; i=i+5)
  {
    servo.write(i);
    delay(50);
  }
}
 
void close()
{
  for(int i=180; i>=0; i=i-5)
  {
    servo.write(i);
    delay(50);
  }
}
 
String entered_password="";
 
void checkPassword(char key)
{
  if (key=='#')
  {
     if (entered_password==password)
     {
      Serial.println("Correct Password");
      open();
      delay(3000);
      close();
     }
     else
     {
      Serial.println("Incorrect Password");
     }
     entered_password="";
  }
  else
  {
    entered_password +=key;
  }
}