Arduino Calculator with Keypad and LCD Display

Project Overview

This project involves building a simple calculator using an Arduino, a 4x4 matrix keypad, and a 16x2 LCD. The calculator performs basic arithmetic operations like addition, subtraction, multiplication, and division. The input is taken from the keypad, and results are displayed on the LCD screen.

Components Used:

• Arduino UNO: The microcontroller used to control the components.

• 16x2 LCD Display: Displays input numbers, operators, and results.

• 4x4 Matrix Keypad: Allows user input for numbers and operations.

• Wires: For connecting components.

• Circuit Diagram

The calculator circuit was designed using Tinkercad. Refer to the diagram below:

Pin Connections:

LCD Pins:

• RS, RW, ENA, DB0-DB7 → Arduino Digital Pins.
• VCC, GND → Power and Ground.

Keypad Pins:

• Rows connected to Arduino Pins 8-11.
• Columns connected to Pins 12, 13, A0, A1.

Features:

• Basic Arithmetic: Supports addition (+), subtraction (-), multiplication (*), and division (/).

• Error Handling: Displays an error when attempting division by zero.

• Reset Function: Pressing C clears the display and resets the calculator.

How It Works:

• The user inputs numbers and operations using the keypad.
• The input is displayed on the 16x2 LCD.
• Upon pressing the # key, the result of the operation is displayed.
• For square root calculations, pressing the dedicated button reads the first number and displays its square root

Picture of the circuit in Tinkercad: