In the code written in Arduino IDE is demnostrated the work of a matrix keypad consisted of three rows and four columns. The three row pins and four column pins are attached to Arduino board. Assigned ...

Objective: Often times, we need to secure a room at our home or office (perhaps a secret dexter ’s laboratory) so that no one can access the room without our permission and ensure protection against ...

A keypad is one of the most commonly used input devices in microprocessor applications. In a standard keypad wired as an X-Y switch matrix, normally-open switches connect a row to a column when ...