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 ...

This project implements a door lock system using RFID cards and a keypad. The system is built on the Arduino platform and uses an RFID reader, a servo motor, a keypad, and an LCD display to provide ...

The ARDUINO IDE associated with the ARDUINO board uses specific numbering, assigning numbers from 0 to 19 to digital pins 0 to 13 and numbers A0 to A5 to analog pins. GCBasic directly manipulates the ...

The addition of a few resistors converts the key pads to one wire and saves many digital pins at the cost one analogue pin. Libraries are not needed anymore and will save many memory bytes but lacking ...