brmlab/brmdoor_libnfc
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Ondrej Mikle 2018-07-26 02:32:11 +02:00
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@ -113,6 +113,22 @@ If you have `pcscd` running, it will take over the reader and you can't use it.
Similarly, you have to blacklist `pn533` and `pn533_usb` kernel modules (usually in a file like `/etc/modprobe.d/blacklist.conf`).
## Photo of an actual installation
![Raspberry with stepup](https://brmlab.cz/_media/project/brmdoor/brmlab_03.jpg?cache=&w=900&h=600&tok=bcf9ca)
![Connection to PN532 reader](https://brmlab.cz/_media/project/brmdoor/brmlab_04.jpg?cache=&w=900&h=600&tok=575eb2)
Security note: it's better to have reader behind door, but this door is metal (thus external or wormhole antenna needed).
Even though the reader is not connected directly to *open* PIN which could be triggered by applying power to it.
There are two ways to do it:
- Separate antenna connected to [external antenna PINs provided by Adafruit PN532 board](https://learn.adafruit.com/adafruit-pn532-rfid-nfc/downloads)
Antenna is quite difficult to tune (requires right LC circuit with proper coils and capacitors).
- [Wormhole antenna](https://i.imgur.com/fclA2b2.jpg) - two coils connected with wire. It generally works, but is not
very reliable.
## Startup with systemd and GNU screen
Example of startup unit for systemd, put in `/etc/systemd/system/brmdoor.service` and this repo cloned in `/root/brmdoor_libnfc`: