This document describes a fingerprint-based security system that uses a microcontroller and fingerprint module to open a lock only for authorized users. The system scans a fingerprint and verifies it matches one stored on the microcontroller. If so, it activates a relay that opens the locked system. The fingerprint module can store up to 750 fingerprints and is connected to the microcontroller via a serial port. The system provides security for items like medications, jewelry, and documents without needing passwords.