Strikedoor

• /usr/local/bin/door.sh——
  13¤h1. Construction

The strike lock needs 5V 1A open the lock, (some strike locks need 12V),
therefore we need a relay\-transistor circuit like this:

http://www.flickr.com/photos/anachrocomputer/3242387876/in/pool\-make
http://makezine.com/2009/02/02/connecting\-a\-relay\-to\-arduino/

all wired with common ground.
Furthermore, the RFID reader has a led/buzzer function which we hooked directly to the relay output.

Further work:

{
  5V / strike lock signal         tx
 12V / rfid reader power          tx
 GND / common ground              tx
  D0 / rfid reader data0          rx
  D1 / rfid reader data1          rx
 LED / led indicator   (optional) tx
 BUZZ/ sound indicator (optional) tx
}