In this rapidly growing era of technology, it is important to provide security to our doors. In this prototype, there will be password encryption. On pressing the correct password, the door opens and if the password entered is incorrect then the door remains closed.
The Arduino is a programmable #microcontroller, it's an open-source electronics proto-type platform. It interacts with the user by receiving input with the aid of sensors and provides the output employing LED, buzzer, etc.,
In order to know more about the Arduino UNO, refer to this article.
Jumper wires are used to establish connections between different components in the circuit.
A 4x4 matrix keypad is used as an input device that takes inputs from the users. It consists of 16 pins in total with four rows and four columns. On pressing a key, a connection will be established between the corresponding row and column between which the switch is placed.
Check this project of 4*4 Keypad as well - Link.
LCD- Liquid Crystal Display is an electronic module that uses liquid crystal to produce a visible image. It is the basic module that is generally used in DIY and circuits. The display segments are affordable and simply programmable.
A #breadboard is a flat piece of wood that is provided with holes that allow users to build a circuit including the components and connections without the need for soldering due to which it is reusable and finds its best usage for the students who are new to build circuits. The holes in any horizontal line will be in series whereas the vertical holes remain at an equipotential state. There are different sizes of breadboards available in the market which include "full size", "half - size" and, "mini size" breadboards.
A servomotor is a rotary or linear actuator that allows for precise control of angular or linear position, velocity, and acceleration. A servomotor is a closed-loop servomechanism that uses position feedback to control its motion and final position.
The Arduino Integrated Development Environment (IDE) is a cross-platform application (for Windows, macOS, Linux) that is written in functions from C and C++. It is used to write and upload programs to Arduino compatible boards, but also, with the help of third-party cores, other vendor development boards.
Circuit connection involves the following steps:
R1-R4 pins of the keypad are connected to 9-6 PWM pins of the Arduino UNO respectively.
C1-C4 pins of the keypad are connected to 5-2 PWM pins of the Arduino UNO respectively.
DB4-DB7 pins of the LCD are connected to 13-10 PWM pins of the Arduino UNO respectively.
D0 of the Arduino is connected to the Regester select pin of the LCD.
D1 of the Arduino is connected to the Enable pin of the LCD.
The Power and ground of the LCD are connected to positive and negative terminals of the breadboard respectively.
The Read/ Write pin of the LCD is connected to the negative terminal of the breadboard.
LED Anode pin of the LCD is connected to the negative terminal of the resistor.
LED Cathode pin of the LCD is connected to the ground.
The Contrast pin of the LCD is connected to the positive terminal of the LCD.
The Signal pin of the servo motor is connected to the A0 pin of the Arduino.
Power and ground pins of the servo motor are connected to 5V and ground respectively
The LCD present will instruct the user to enter the password, if the password is entered correctly, then the servo motor will open the door and displays a text saying- welcome home. if the entered password does not match with the original password then the door will remain closed along with a text on LCD saying- access denied.
Check the Project working video here - Smart Door Lock Prototype || Arduino Projects || Keypad 4x4 || LCD Interfacing || Servo Motor
Video By- Vishwa Raj V
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Content Written by-
Name - Kiranmai Chigurupati
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