Candy Dispenser With Password Lock Powered by Arduino

Hello guys, In this instructables i will show you how you can make a candy dispenser!

Now you might be wondering, alas a candy dispenser there is nothing special here! well the special part here is this is not just a ordinary dispener "This dispenser is password protected"

This dispenser drops some candies only after you enter the correct code, well that's some security to save your candies from friends who loves to steal your sweets.

The logic behind the working of this dispenser is very simple, I'll explain in a common way,

Preset of codes will be fed to the uno board and it will be stored inside, when the correct(preset code is pressed) the servo gets activated thereby the candies pop out.

All these messages can be seen on the LCD display, You can also follow the instructions shown here to reset the code.

In the other way if wrong password is pressed, the servo remains idle thereby stopping the candies from coming out.

This is a great project that is useful at the parties.

I have given complete information regarding this project so that anybody could build and take most out of it.

Complete list of components that is required to build this project

Arduino Uno Kit for this project from here

Keypad matrix 4x4

Micro Servo

LCD module with i2c

Piece of Cardboard

Strips of cardboard

Bottle top part

Ruler or acrylic strip

Hot Glue

Paper cutter

Candies

Programming cable for Uno

Arduino IDE

The circuit is not so complex here, Let me break it down for you component wise.

We are using Keypad matrix, LCD module and servo

4x4 Keypad connections

The keypad has 8 pins for rows and columns, allowing it to detect key presses.

Each pin of the keypad is connected to the following digital pin on the Arduino

Pin 1 of the keypad to Digital Pin 2

Pin 2 of the keypad to Digital Pin 3

Pin 3 of the keypad to Digital Pin 4

Pin 4 of the keypad to Digital Pin 5

Pin 5 of the keypad to Digital Pin 6

Pin 6 of the keypad to Digital Pin 7

Pin 7 of the keypad to Digital Pin 8

Pin 8 of the keypad to Digital Pin 9

16x2 LCD Display with I2c module

The connection from I2c module can be made to arduino using 4 pins and the connection are as follows

Scl to A5 and the Sda to A4, Gnd to Gnd and Vcc to 5v pin

Servo Motor connections

The Signal pin (usually yellow or white) of the servo motor connects to Digital Pin A2 on the Arduino.

VCC is connected to the 5V pin on the Arduino whereas GND is connected to the GND pin on the Arduino.

After you make these connections, You can upload the code to uno

Simply open IDE, connect to uno using cable and upload the code, Check for port and board type.

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After you have all the electronics assembled we can head over to give it a proper form that looks like some sort of device, so i will be following this simply on cardboard setup.

I will start by keeping all the components on this piece and making a note of placements, After this is done we can use hot glue and double sided adhesive to keep them secure.

I had a few 3d printed pieces(you can replace them with cardboard or acrylic sheets also)

The keypad matrix is thin and flexible so pressing on it would cause it to not work properly sometimes, so the solution is providing it with a back support. Use small amount of hot glue for this purpose.

The component placing is left to you, there is no thumb rule here.

After you make these adjustments you can leave some space to keep the dispenser and in the below step we will see how to make this mechanism.

This is the main part that controls the flow of candies and in short this part should work without any issues, The principle that we are following here is similar to the flour mill machine.

I will use the cap, i marked a small circle inside and used a cutter to trim those areas.

Now the inside circle should be glued well to the horns of the servo, Use hot glue for this purpose and make sure it is secured well because if it falls of by any chance the candies from inside of the container will come out without any control.

Attach the servo to bottle side, here the glue should not be too hot else the plastic may disfigure.

Using this is dispenser is simple like every other dispensers, This is kind of plug and play device.

I used transparent case to store the candies just to show you guys the working mechanism, You can replace this with any other material but make sure you are using food grade materials.

The size of container can be decided depending on your requirement.

Feed the container with your favourite candies and later you connect USB cable to uno, Now you should see the LCD module showing a message to enter the code.

By default the code is 1234 you can change this, Press * first and later continue with the passcode and press the A button.

The servo open up opening the lid of dispenser and thereby dispensing some candies, You can change the timings like how much candies should be dispensed in a single time.

Feel free to customize this model as per your taste and let me know how it went for you, Dont forget to share in the I made it section.

So gear up and build this dispenser, Thank you and happy build, Like always if you have any suggestions let me know in the discussion part.

The dispensing of candies look soo cool like you withdraw money from ATM!

Watch the complete video tutorial of this project, You will miss many cool things if you miss to have a look at this video.

Candy dispensing is soo much fun after you make this project! If you are left with any questions feel free to leave those in the comments section, Thanks and have a great dispensing :)