For this, just wire up the hardware (arduino+keypad) as described earlier. Although the code is an entry-level one, it includes a secret key option that will need to be entered on the keypad. The ...

If you want to add a keypad to your Arduino project ... though they will be open in the future. The code is already available for download on his website. Future plans include an LED to indicate ...

He’s constructed an Arduino keypad door lock — without using any ... [Andrea] has hard-coded in a few safety codes into the firmware to allow him to forcefully open the door — you know ...