UNIQUE SECRET BOOK

I read MANY inscrutables & posts and saw that no one had created one like the one I made .

You must have seen many books which have a secret compartment in it.BUT it is DIFFERENT.

You see this approach allows reader to read whole book keeping the secret compartment out of sight. Thus is a TRULY secret book.

Epilog contest:
If I won the Zing laser I would put it to good use!

I will make small mechanical objects for my projects.

The laser cutter would be super useful for making custom parts.

THING YOU NEED

Arduino nano (preferable) OR any other

servo moter

keypad

jumper wires

cardboard for making compartment

and MOST IMPORTANT A "BOOK"

Get a Book!

First select a book that no-one in their right mind would ever want to read.

You will need a good thick book. Hard back is best but a paperback will also work.

if you are using paper back,then first apply card board on it and then start other steps

Starting With Compartment

firstly ..

Dimensions of compartment will depend on size of your book spine.

Design of the compartment is shown in image.

In this compartment ,one place is for arduino and servo moter and other for keeping your things.

ARduino Coding

Arduino code is very much easy.

For this you need

arduino software

libraries : Password click here,

keypad here

Code:

#include <Password.h>
#include  <Keypad.h>

#include <Servo.h>

Servo myservo; //declares servo

Password password = Password( "14471" );   //password to unlock box, can be changed

const byte ROWS = 4; // Four rows

const byte COLS = 4; // columns

// Define the Keymap

char keys[ROWS][COLS] = {

{'1','2','3','A'},

{'4','5','6','B'},

{'7','8','9','C'},

{'*','0','#','D'}

};

// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.

byte rowPins[ROWS] = { 5, 4, 3, 2 };

// Connect keypad COL0, COL1 and COL2 to these Arduino pins.

byte colPins[COLS] = { 8, 7, 6, 9 };

// Create the Keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){

  Serial.begin(9600);

Serial.write(254);

Serial.write(0x01);

 delay(200);

 myservo.attach(12); //servo on digital pin 9 //servo

keypad.addEventListener(keypadEvent); //add an event listener for this keypad

  }<br>

void loop(){

  keypad.getKey();

 }
  //take care of some special events

void keypadEvent(KeypadEvent eKey){

 switch (keypad.getState()){

 case PRESSED:

Serial.print("Enter: ");

Serial.println(eKey);

delay(10);

Serial.write(254);

switch (eKey){

 case 'A': checkPassword();delay(1); break;

case 'B': password.reset(); delay(1); break;

default: password.append(eKey); delay(1);

void checkPassword(){

  
if (password.evaluate()){

  //if password is right open box

   Serial.println("Accepted");

 Serial.write(9);delay(10);

 //Add code to run if it works

 myservo.write(135);

delay(500); //wait 5 seconds

else{

 Serial.println("Denied");

//if passwords wrong keep box locked

 Serial.write(254);

delay(10);

 //add code to run if it did not work

myservo.write(45);

   delay(500); //wait 5 seconds

Downloads

project_secret_book.ino

Connection

keypad to arduino connection (refer image)

8 to Digital 5 of Arduino

7 to Digital 4

6 to Digital 3

5 to Digital 2

4 to Digital 8

3 to Digital 7

2 to Digital 6

1 to Digital 9

Servo Moter to Arduino connection (refer image)

Orange to Digital 12

Brown to GND

Red to 5V

Set Up Locking Mechanism Inside Compartment

To lock the Compartment, I am using a three eye screws and a locking pin. Two eye screws are mounted to the inside of the front panel of the box. A third eye screw is mounted to the inside of the lid of the box. When the lid is closed, the holes of the eye screws line up. The box is locked by inserting a pin through all three holes while the box is closed. The box is unlocked by removing the pin.

The pin is a simple piece of steel wire (straightened paperclip). It is moved by the servo. The wire is attached to the servo at one of the holes on the servo horn (actuator arm).