The microcontroller acts as the Central Processing Unit for the calculator in this project. • LCD : The LCD (Liquid Crystal Display) is a display device the desire output programmed by the Programmer.

In this project we will build our own Arduino based calculator where the values can be sent in through a keypad (4×4 keypad) and result can be viewed on a LCD screen (16×2 Dot-matrix).

With only a pencil eraser, a hot air gun, and a screwdriver (for disassembly), [Joe] was able to fix his phone’s screen in just under 10 minutes.