BANNED, thank you for posting the library file! You say you rewrote the arduino_fingerprint code to call the function of the library. What exactly did you change in the code to get it working? And do I have to change something inside Adafruit_Fingerprint.h file as well? The problem is when I only replace the Adafruit_Fingerprint.cpp file with yours I get this error from arduino when calling loadChar(): 'class Adafruit_Fingerprint' has no member named 'loadChar'. Thank you in advance!