calculator system

This project is a Calculator System based on AVR microcontroller that uses a 4x4 keypad for user input and a 16x2 LCD for real-time display of numbers, operations, and results. It supports the four basic arithmetic operations (addition, subtraction, multiplication, division), checks for invalid inputs such as divide-by-zero, and ensures smooth interaction between hardware and software. The project demonstrates practical skills in AVR programming, keypad scanning, and LCD interfacing.