The fingerprint sensor overview
The Fingerprint sensor is the GT-511C3 device from ADH Technology. This device con-
tains an optical sensor for reading the fingerprints but also an ARM Cortex M3 processor
for computing the image recognition. The interface to this device is via serial UART, using
3.3V level logic, and at a baud rate of 9600 bps. There are four wires to connect from the
JST connector: transmit, receive, GND, and power.
The datasheet states that the false acceptance rate is less than .001 percent and the false re-
jection rate is less than .1 percent. In short, this is a very capable fingerprint sensor. The
fingerprint data is analyzed and stored on this device. We will use an existing library to
communicate with this hardware.