Firmware Development for Fingerprint Smart Wallet

Overview I developed firmware for a physical fingerprint smart wallet, enabling secure locking/unlocking via fingerprint, battery and charging management, motor control, BLE communication, LED feedback, and emergency override capabilities.

Roles IoT Firmware Lead Engineer

Tech Stack C · C++ · Python · BLE · Embedded Systems

Designed and implemented fingerprint enrollment, reset, and authentication logic for secure locking/unlocking

Integrated low-power battery monitoring and charging utilities for seamless device operation

Controlled motor for mechanical lock engagement and provided LED indicators for status feedback

Developed mobile app control via Bluetooth Low Energy (BLE) for unlocking and device status view

Built an emergency unlock mechanism using physical override and BLE redundancy for fail-safe access

The firmware delivers a robust, user-friendly IoT wallet experience, combining biometric security, reliable hardware control, and mobile connectivity for modern, secure usage.