Summary
Our current access control system was not all that flexible, and we want to switch to a new system.
Architecture
Door scanner
We have an Asia-Teco scanner speaks the wiegand protocol (details can be found here: https://a.aliexpress.com/_EJOtZhl). It has the following pinout on the cable:
| VCC (+12V) | Red |
| GND | Black |
| D0/RX/4R+ | Green |
| D1/TX/4R- | White |
| LED | Blue |
| BEEP | Yellow |
| WG26/WG34 | Gray |
An arduino combined with a stepup converter is used to translate the wiegand protocol to a text-based format which is exposed over usb-serial. The code for this can be found here: https://github.com/NURDspace/spacenanny-wiegand-arduino. This is linked together according to the following schematic, using a long piece of cat5 as the cable:
This arduino is connected using USB to spacenanny, and we run the tag scanner software there (https://gitea.vm.nurd.space/NURDspace/tag-scanner).