Connect up to 10 buttons using a single interrupt.
Project tutorial by Svizel_pritula
Replacing the old and expensive mechanical system with the much reliable and cheap electrical system using Arduino!
Project showcase by PuranSingh and PiaraSingh
Control a solenoid/relay or whatever your locking system, and change the passcode by the keypad only, no program reupload.
Project tutorial by SurtrTech
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