This is a great fingerprint module from ADH-Tech that communicates over TTL Serial so you can easily embed it into your next project.
This repository contains example code to work with it.
- /FPS_GT511C3 - Arduino Library to interface with the sensor.
The original library license is as follows:
" Created by Josh Hawley, July 23rd 2013 Licensed for non-commercial use, must include this license message basically, Feel free to hack away at it, but just give me credit for my work =) TLDR; Wil Wheaton's Law "