If you have a paper clip however, getting back in is no problem. These tips from Instructables user DIYHacksAndHowTos will get almost any common indoor locked door open again in a snap, and all it ...

Learn how to make a cardboard security safe for storing money, notes, or valuables — complete with a working code lock! 🔐💵 This DIY tutorial uses cardboard, paper clips, rubber bands, and ...

For code development, we just connected an LED with a resistor to the output line that will control the door lock. With everything wired in the prototyping board, it’s time to test things out.