Hello every one welcome back . In this project we will make a simple calculator using calculator keypad and 16×2 alphanumeric Liquid Crystal Display . This calculator can calculate simple floating numbers with addition, subtraction,multiplication and division operation . This calculator is only for conceptual project and it cannot calculate some operation like minus multiplication and other complex scientific operation .
The input is taken from calculator keypad . If you do not know about how keypad works with avr microcontroller please do first previous tutorial on keypad interface with multiple LED , that project will give you idea about keypad interfacing with atmega32 microcontroller . After doing that project now you are ready to do this project .
The code is divided into several parts , so I cannot display code here , Please download code with atmel studio 6 file , proteus circuit digram , hex file etc from Here : calculator using atmega32