Problem interfacing ok-300 fingerprint sensor module

Hei guys, i have problem interfacing ok-300 fingerprint sensor module

I already follow the wiring through instruction that i follow from this two link ( link 1 , link 2 )

I wondering why the sensor's red light is not turning to on when i connect it to arduino through my computer. I already test the connection using multimeter to check and no problem with the wiring and the arduino

another thing whether these sensors can use the same library as the adafruit product ?

sorry for my bad english, i appreciate all your help
thanks