Building a Network Biometric Authentication

The project aims to build a small, efficient, and scalable biometric authentication system that can be used for securing doorways all through a complex.

A fingerprint card scanner will be used as the capturing device based on FingerPrint Cards capacitance. An ATmega32 microcontroller is used to capture the data which will be stored on external SRAM. This is done through the microcontrollers USART serial port into a serial to Ethernet converter to a server computer. The filtering and authentication is performed by the computer which then sends back the result over Ethernet to the microcontroller.

During the capturing of fingerprint image, the microcontroller was set to wait for an available character in USART. It will start the image capturing if the character available is equal to “G” after reading it. From the fingerprint reader, the stream is read and the data point is stored in SRAM simultaneously and will be transmitted later after adding it to the Ethernet packet. The LEDs will output the matching result. The microcontroller will return to waiting for another read once all 30400 bytes have been sent. The fingerprint verification goes through filtering and comparing to legitimate minutiae.

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