can you connect this sensor to the raspberry pi 3 B Plus? and if so, what is the pinout? I've tried any possible combined and it does not work!

Raspberry PI 3 Plus has bluetooth, The uart is connected to the bluetooth by default, so you can't use it unless set to turn off bluetooth. Another easier way is to use USB TO TTL module, such as FT232RL OR CP2102 breakout connect to the USB port

Does the light stay on all the time or just wen a finger is applied?

it is not all the time,just went need get a finger press.

Mine doesn't light up and the enroll code in Adafruit Library doesn't detect it. Is that a corregible mistake or is it just damaged?

1, first open the ARDUINO IDE software, input fingerprint in the Library management, installation adafruit fingerprint Sensor Library Ver 1.1.3 2, open file --> example --> adafruit Fingerprint Sensor Library --> enroll, to download the program to the arduino uno r3, 3, open the serial port monitor, baud rate is set to 9600, we first not connect the fingerprint module, a serial port monitor displays The Adafruit Fingerprint sensor enrollment Did not find fingerprint sensor: ( 4, connect the fingerprint module to the board, RED 5 v, BLACK GND, GREEN 2, WHITE 3, the yellow and blue do not need the connect. Then reopen the serial port monitor, It will show: The Adafruit Fingerprint sensor enrollment Found fingerprint sensor. Ready to enroll a fingerprint! Both Please type in the ID # (from 1 to 127) you want to save this finger as... You can send 1 to 127 text that enroll fingerpirnt. and then the fingerpint module will be light up.

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