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 ...

An Arduino Pomodoro Timer project that allows for preset and custom time inputs. Built with a 16x2 LCD display, Active Buzzer and a 4x4 Keypad. This is my first electronics project. I have built it to ...