fingerpi

Python library for GT-511C3. The library was tested on Raspberry Zero.

Connectivity

R-Pi GPIO pinout: https://pinout.xyz/

Raspberry Pi Zero (40 pin, 3.3 V IOs)

I used optional resistors in case there is another FTDI connection

                       (Optional)
----------------------   1kOhm    ------------------------
GT-511C3     Tx (1)--|----/\/\----|--(10) RxD   R-Pi Zero
             Rx (2)--|----/\/\----|--(8)  TxD
            Gnd (3)--|------------|--(6) Gnd
             5V (4)--|------------|--(2) 5V
----------------------            ------------------------

Raspberry Pi (40 pin, 5 V IOs)

----------------------                 ------------------------
GT-511C3     Tx (1)--|-----------------|--(10) RxD   R-Pi
             Rx (2)--|---.-----/\/\----|--(8)  TxD
                     |   |    1kOhm    |
                     |   \             |
                     |   /             |
                     |   \ 2kOhm       |
                     |   |             |
            Gnd (3)--|---.-------------|--(6) Gnd
             5V (4)--|-----------------|--(2) 5V
----------------------                 ------------------------

Usage

Run demo.py for a demo

Troubleshooting

If you are stuck at Opening connection..., as described out by @Ankush-Pathak in #19:

• Do "sudo nano /boot/config.txt" via ssh or by opening a terminal on the pi.
• Scroll down to the end of the file using arrow keys, on a new line add "dtoverlay=pi3-disable-bt".
• Then do ctrl + o, return(saves your file), ctrl + x(exits nano).
• Reboot.
• If this does not work, many people also suggested changing the modes of the required GPIO pins to ALT0 or ALT5. You could try that too.

TODO

• Documentation
• Unit tests
• GUI