Electronic and Arduino enthusiasts ... The DIY biometric lock is also equipped with three push buttons and a 16×2 LCD display. “This is a security door lock with fingerprint sensor.

The box can be unlocked using a keypad, three tunable knobs, a ‘knocking’ pattern (through a piezo electric sensor), and a fingerprint sensor. The user must provide the proper inputs to each ...

The box is big enough to hold a smart phone and has an Arduino-based time lock. The real trick is making the box so that the Arduino can lock and unlock it with a solenoid. [Digitaljunky] doesn ...