When [Doug] moved into his new house, he found an old alarm panel set up — but it had no monitoring ... showed you how to interface the Arduino with the keypad — [Doug] went the extra mile ...

If you’ve scavenged some random keypads and want to reuse them in a project without the hassle of figuring out the pinouts, then [Cliff Biffle] has an interface module for you. The Keypad Go ...