A keyboard matrix circuit is a design used in most electronic musical keyboards and computer keyboards in which the key switches are connected by a grid of wires, similar to a diode matrix. This kind ...

Keypad phones, believe it or not, are still in use, and there is a surprising amount of variety to choose from. Some of the phones include 4G connectivity, cameras, and are built to last. If you're ...

This project demonstrates a secure door lock system using an Arduino Uno, 4x4 keypad, I2C LCD, and a servo motor. The system allows users to enter a password via the keypad. If the password is correct ...