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 ...

Arduino pins 6, 7, 8, and 9 should connect to the four output lines marked SWT-GND1, SWT-GND2, SWT-GND3, and SWT-GND4 (1-4 on the schematic). The final version of the board takes a 12VDC input to ...

arduino keypad lock 1 Articles Arduino Keypad Door Automation. November 1, 2013 by James Hobson 45 Comments [Andrea] just sent us this great student hack he made for his room. He’s ...

Watch the video below to learn more about his Arduino-based portable keypad that connects to your Arduino development board and offers the complete alphabet, numbers 0-9 as well as several commands.