This is the Hackerspace Warsaw electronic lock mk2 project.

Work in progress! This is a prototype for a TP-Link WR703n based hardware
solution - with a I2C bus on which there is a MAX7300 IO expander and a PN532
NFC tag reader. The I2C is software bit-banged by the kernel, drivers for both
the IO expander and the PN532 are written in Lua.

Files:
    hslockmk2/                                    - this directory
             software/
                      main/                       - code for the central unit of the lock
                           main.lua               - main Lua script
                           lua-libs/              - other Lua libraries
                                   mips-bin/      - C libraries compiled for MIPS/OpenWRT
                                   luai2c.tar.gz  - C i2c library source
                                   luasha2.tar.gz - C sha2 library source

                      keypad/                     - AVR code for the keypad               
             hardware/
                     keypad/                      - KiCAD files for the keypad PCB

You will additonally need luasec, luaposix and luasocket. But you can easily
find these in your favourite distribution, or even the OpenWRT source tree.