==== code source ====
https://gitorious.org/ci-git/base/source/503a4627a9a13edff8e8f208e40d3e308787a7de:expoFlao
Le code (manquant) Python est une version adaptée du code de Adafruit:
http://learn.adafruit.com/adafruits-raspberry-pi-lesson-12-sensing-movement/software
=== TODO list ===