This may require you to reconnect the scanner to your computer or device. A small bump can mess with the serial UART or power between the fingerprint scanner and converter. The cable wire is small compared to the female header socket. This will ensure that the connection is not loose when inserting it into female header sockets of an FTDI or the RedBoard/Arduino Uno. If you are using the JST SH Jumper 4 Wire Assembly instead of the Qwiic cable, it is highly recommended that you make a custom adapter by soldering to the ends of the wire for a secure connection. Double check your connections before powering the scanner. For example, the red wire in this circuit connects Rx to Tx. Note: The colors of the Qwiic Cable are standard for I 2C connections, not UART, so the colors will not match typical standards for colored cables. The image below shows the fingerprint scanner's optical sensing area where the device will be able to scan your fingerprint. UART (Default: 9600 baud) and USB v2.0 (Full Speed) The GT-521F52 is slightly more expensive but it can hold 3000 fingerprints. The GT-521F32 costs less but it can hold only 200 fingerprints. One significant difference to keep in mind when integrating the fingerprint scanner in a project is the number of fingerprints that the device can hold. However, there are a few differences in the boards. The fingerprint scanner has the ability to: Code that was implemented for previous models should be functionally the same. They have the same protocol commands and packet structure. The GT-521F32 and GT-521F52 have a lot in common with the previous models.
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