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Password Protected Security System project using Arduino, Keypad, Piezo Buzzer and LEDs on TinkerCAD

Updated: Mar 24

A #security system for devices now is not only a facility but a necessity. It helps us store data securely and according to our requirements. There are many methods of security and usually, for digital devices, it starts with a password.

We have security scanners at places, fingerprint print, and face recognition security to our devices. Before all that, let us first design a Password Protected Security System for a device using simple Electronic components in TinkerCad, a #simulation software.

Hardware Requirement

These components are not required while building it in the simulation software. To build the circuit manually, click on the links given below to buy the components required.

  1. Arduino UNO Board.

Develop a stronger concept in Arduino through this article:- What is Arduino?

Arduino UNO
Arduino UNO

#Arduino board is a microcontroller that is used to accept inputs from sensors connected and provide an output action on the desired device connected to it. The sensor inputs can be from light-detecting sensors, motion sensors (Ultrasonic or IR), temperature sensors, etc. The output from this device can be received through other output devices such as LED, Buzzer, Serial monitor, etc.

Buy Arduino UNO from here.

2. Resistors

1.5k Ohm Resistor
1.5k Ohm Resistor

Resistors are passive devices that restrict the flow of current or divide the voltage through the circuit. The input power passes through these resistors and then to the sensors to avoid damage.

Buy Resistors from here.

3. Breadboard


The breadboard is the basic component of any circuit building process. All components, be it input sensors or output display devices are connected to the power supply, microcontroller using wired connections through a breadboard. The holes in the breadboard are in series. There are various sizes like full-sized, half-sized, and mini breadboard.

Buy breadboard from here.

4. LED


Light Emitting Diode is a commonly used light source. It is a semiconductor that emits light when current flows through it.

Buy LED from here.

5. Piezo Buzzer

Piezo Buzzer
Piezo Buzzer

It is an electrical component that generates a beep sound on receiving an input. It works on the principle of #piezo crystal.

Buy Piezo buzzer from here.

6. Jumper Wires

Jumper Wires
Jumper Wires

These are the main components that are used to establish the connections between different devices of the circuit.

Buy Jumper Wires from here.

7. 4x4 Keypad

4x4 Keypad
4x4 Keypad

A 4*4 matrix is used to insert input values into the project. This particular component has a total of 8 terminals, driven out from the 16 buttons present in the module.

Buy 4*4 Keypad from here.

NOTE: The description of the electrical components is given for reference. We don't need the physical components for this project. The circuit simulation is done in the TinkerCad software.

Software Requirement

TinkerCad circuit simulation software.

TinkerCad Logo
TinkerCad Logo

It is an online simulation software used for circuit design. It has all the electrical components required to built circuits and runs them.

Visit the TinkerCad website.

Circuit Connections and its Working:

The circuit connections are simple and are as follows.

The input device used here is the 4*4 #keypad. It has 8 terminals and here each terminal is connected to one digital pin of the Arduino board to allow Arduino to receive input from the keypad. Pressing of each key triggers a particular function of each of the 8 terminals and hence the input is received by the Arduino.

The #breadboard is going to house all the external connections done to the Arduino board. So the power supply line and Ground line are specified separately by making a connection from 5V and GND pins from the Arduino board respectively.

We will be using 2 two #LEDs along with a Piezo buzzer as output. One LED can be chosen RED and the other can be chosen GREEN. The Cathode of the LEDs is connected to the ground line through resistors and the Anode is connected to the digital pins of Arduino, D10, and D11 respectively.

The positive terminal of the Piezo #buzzer is connected to another digital pin of Arduino, say D12. The negative terminal of the buzzer is connected to the ground line on the breadboard.


Watch the below-given project video for the practical explanation of designing the circuit and to know how the simulation #software works.

Project Video By - Navya Tatiparth

Simulation software plays a major role in the building of large circuits as they help analyze the working of the circuit before it can be built practically. It helps us create a #virtual design of the circuit we want to build and avoid damages to the circuit if in case we don't know, beforehand about the correct circuit connections.

For more projects through TinkerCad click here.

Simulation software can help us build more effective and efficient projects as it provides #validation for the circuit we will be building using the actual components. #Design your own circuit, run the code in the software, and validate your project.




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