Fingerprint Based Biometric Voting Machine using Arduino

The Fingerprint Based Biometric Voting Machine operates by integrating an Arduino Uno microcontroller with an optical fingerprint sensor module to authenticate users before allowing them to cast a ballot. When a voter places their finger on the sensor, the module captures an optical image of the fingerprint ridges and valleys, converting it into a unique digital template via internal algorithms. The Arduino Uno communicates with this sensor, typically using serial communication, to compare the live scan against a pre-registered database of authorized voter templates. If a match is found and the system confirms the voter has not yet cast a ballot, the Arduino updates its internal state to prevent double voting. The user then interacts with the system using push buttons to select their preferred candidate. Visual and auditory feedback is provided throughout the process: two LEDs and a buzzer signal successful authentication, vote casting status, or errors, while a 16x2 LCD screen displays real-time instructions, prompts, and voting tallies. Resistors (1K and 2.2K) are incorporated into the circuit to properly bias components and manage logic level or LED current limits. The entire system is powered by an external power supply routed through a breadboard and connecting wires, ensuring stable operation of the microcontroller, display, and peripherals.