Låseblik:
  Abloy EL412 

Strøm:
  2x 12v lader (fra biltema)
  2x 12v blyakkumulator (fra biltema)
  Noget sikring til batteri + sikringsboks

Arduino:
  1x Arduino
  1x Strøm til Arduino (24v -> 5v)
  1x Prototyping shield til Arduino

Kommunikation:
  4x RS485 dil-pakker (MAX487) OK
  1x D-sub 9 hun OK

Dør og bipper:
  2x MOS-FET RFD14N05 + det løse

Adgangskontrol:
  2x RFID-læser til Arduino
  1x Matrix Keypad OK 
  2x RGB-lysdiode OK
  1x Bipper OK, bruger den fra nuværednde installation
  2x Kasse OK

Styring:
  1x Søkris net4801
  1x VT220 Terminal
  1x USB RFID
  1x Strømstik
  

Example implementation http://pskillenrules.blogspot.com/2009/08/arduino-and-rs485.html

The MAX487 chip only allows half-duplex. This means that the receiver and transmitter must switch between RX and TX mode internally as well as on the enable pins on the level-converter.

The protocol will be Modbus RTU for which many implementations exists. The server (“grisen”) will be the master.

Pin out for the 8P8C modular plug socket in the server box (“Grisen”).

The Cat5e cable going to the front door is wired by the EIA-568-B colour code, whereas the other cables in the structured cabling uses EIA-568-A colours.

The door-arduino has the following registers:

1. status
2. rfid
...
x. pincode1-4