Arduino Calculator

Electronic Calculator using Arduino UNO R3 2. Objectives To build a basic calculator (addition, subtraction, multiplication, division) using Arduino UNO R3 as the main controller. To study how to interface a Keypad with Arduino for user input. To learn programming in Arduino IDE to process input and display results. To design a portable calculator powered by a 9V battery. 3. Components Used Arduino UNO R3 4x4 Keypad (for numbers and operators) Switch (Power ON/OFF) 9V Battery with connector Jumper wires and Breadboard LCD (16x2) or OLED Display [for showing results] 4. Working Principle When the switch is turned ON, the 9V battery powers the Arduino UNO R3 board. The user presses numbers and operators on the Keypad → Arduino reads the signals. Arduino processes the input and performs calculations (+, −, ×, ÷). The result is displayed on the LCD/OLED screen (or Serial Monitor if no display is used). A “Clear” button can reset the input to start a new calculation. 5. Scope of Work Supports only basic arithmetic operations: addition, subtraction, multiplication, division. Works with integer numbers (basic level, no complex equations). Powered by a 9V battery for portability. 6. Benefits Can be used as a prototype for a simple electronic calculator. Enhances knowledge of microcontrollers and C++ programming on Arduino. Improves skills in circuit design and embedded system development.