How to Interface 4×4 Matrix Keypad with LPC2148
Matrix keypad is one of the widely used input devices. Some of the application includes Mobile keypad, Telephone dial pad, calculator, ATM etc. Keypad provides an easy way to allow user to provide input to any system. In this article, we will explain how to interface 4×4 matrix keypad with LPC2148. The pressed key will be displayed on LCD.