Intertechno library for the Arduino.

  This library implements the following features:

   - generate command sequences that once sent to an OOK rf stage are able
   to control intertechno radio switches and doorbells.

  you can get such a stage either by hacking a factory remote control [1]
  or by using something like 'Grove - 433MHz Simple RF link kit' [2]
  from Seeedstudio. that TX module has been tested and found to work well
  even at low (3.3v) Vcc levels.

  Author:          Petre Rodan <2b4eda@subdimension.ro>
  Available from:  https://github.com/rodan/intertechno
  License:         GNU GPLv3

  Intertechno is a manufacturer of radio controlled relays and circuits
  that allow house automation projects.

# 2024 update

  there are two [3] intertechno protocols in the wild now and the arduino lib only implements one of them. see my msp430 [4] that can interface with both.

  [1] https://picasaweb.google.com/petre.rodan/IntertechnoHack
  [2] http://www.seeedstudio.com/depot/grove-433mhz-simple-rf-link-kit-p-1062.html?cPath=139_140
  [3] https://github.com/rodan/voidvent/tree/master/doc/sig
  [4] https://github.com/rodan/voidvent/blob/master/firmware/base_station/intertechno.c