Basic Test for the GT-511C3 Fingerprint Scanner Module

The article on testing the GT-511C3 fingerprint module uses an Arduino Uno to test that basic communications are working on the module. This can be used to test that the module is correctly wired and also that it is working.

Sending a character from the Serial Monitor window of the Arduino IDE starts the test by sending a “open” command packet to the fingerprint module. If the fingerprint module is working, it should send back an acknowledge packet and an information packet that are both displayed as hexadecimal bytes in the Serial Monitor window.

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