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 ...

[Andrea] just sent us this great student hack he made for his room. He’s constructed an Arduino keypad door lock — without using any proper fastening hardware! The entire build is made out of scrap ...

Make: MOBOTIX Model code: MX-Bell1-Button-F2 Type of Kit/ System: Video, Keypad & Audio Panel Type (separate): Video & Audio Panels No of Call Buttons on Panel: 2 call buttons Additional info: ...

[Tony] has developed a method of using a state machine to validate keypad inputs. His method checks the commands character by character as they are entered in by a 16 button keypad. State machines are ...