Fingerprint Power Button

Uses a fingerprint sensor to turn on a personal computer.
The sensor is controlled using a microcontroller and replaces the PC's power button.
Allows saving of multiple fingerprints to change how access is allowed

Uses an optical fingerprint sensor by Adafruit as well as their associated library: https://www.adafruit.com/product/751
The sensor is controlled using an Arduino Uno microcontroller and replaces the PC's power button with a transistor circuit. This is done by connecting the transistor circuit's input and output to the same motherboard pins as the PC's power button.
When a valid fingerprint is read, the Arduino activates this transistor circuit, mimicking a PC power button press.
The code allows saving multiple fingerprints to change how access is allowed. These are stored on-board in the fingerprint sensor and require separate code to enroll. (Included on github)