What is a 4x4 Matrix Keypad? Before we 4x4 matrix keypad interface with the microcontroller, first we need to understand how it works. Matrix keypad consists of a set of Push buttons, which are ...

Here we describe the interfacing of three 16×2 LCDs with common data lines to an Arduino Uno board. Four data lines of all the three LCDs are connected to digital pins of the Arduino Uno board but ...