You can clone with
Implement RFID reader for doorduino.
A read RFID tag will result in a hash sent in similar way to a swipe card.
remove EXPORT sillyness
Makefile: don't reset arduino on opening character device
Makefile: use 19200 baud for uploading with avrdude
this only takes a few milliseconds longer and works
with the ATmega16 chip on old Arduinos too
Makefile: optimize for speed instead of size
Makefile: complete rename
add submodule for arduino headers and use it
removed some legacy code
rename project to doorduino
split serial code into its own file
use my own implementation of SHA-1
use two stop bits for serial connection