Components and Functionality The Arduino biometric lock box is equipped with an infrared sensor which checks to see if the door is closed, ensuring that the lockbox is secure at all times. A ...

Once the box is unlocked, the user may update the passwords, combinations, and fingerprints that must be provided to unlock the box again. Watch this video on YouTube. Source: Bruce Land ...

The real trick is making the box so that the Arduino can lock and unlock it with a solenoid. [Digitaljunky] doesn’t have a 3D printer, so he used Fimo clay to mold a custom latch piece.