#include <Password.h>
#include <Keypad.h>
#include <Servo.h>
Servo myservo;
Password password = Password("2468"); // Set password
const byte ROWS = 4; // Set four rows
const byte COLS = 4; // Set four columns
char keys[ROWS][COLS] = { // Define the keymap
 {'1','2','3','A'},
 {'4','5','6','B'},
 {'7','8','9','C'},
 {'*','0','#','D'}
};
byte rowPins[ROWS] = { 9,8,7,6 }; // Pins connected to keypad
 // ROW0, ROW1, ROW2 and ROW3
byte colPins[COLS] = { 5,4,3,2, }; // Pins connected to keypad
 // COL0, COL1 and COL2
 // Create the keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins,
 ROWS, COLS);
void setup() {
 Serial.begin(9600);
 delay(200);
 pinMode(11, OUTPUT); // Set green LED as output
 pinMode(12, OUTPUT); // Set red LED as output
 myservo.attach(13); // Pin connected to servo
 keypad.addEventListener(keypadEvent); // Add an event listener to
 // detect keypresses
}
void loop() {
 keypad.getKey();
 myservo.write(0);
}
void keypadEvent(KeypadEvent eKey) {
 switch (keypad.getState()) {
 case PRESSED:
 Serial.print("Pressed: ");
 Serial.println(eKey);
 switch (eKey) {
 case '*': checkPassword(); break;
 case '#': password.reset(); break;
 default: password.append(eKey);
 }
 }
}
void checkPassword() {
 if (password.evaluate() ){
 Serial.println("Success"); // If the password is correct...
 myservo.write(90); // Move servo arm 90 degrees
 digitalWrite(11, HIGH); // Turn on green LED
 delay(500); // Wait 5 seconds
 digitalWrite(11, LOW); // Turn off green LED
 } else {
 Serial.println("Wrong"); // If the password is incorrect...
 myservo.write(0);
 digitalWrite(12, HIGH); // Turn on red LED
 delay(500); // Wait 5 seconds
 digitalWrite(12, LOW); // Turn off red LED
 }
}