https://github.com/robwlakes/ArduinoWeatherOS
http://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/
https://www.raspberrypi.org/forums/viewtopic.php?f=33&t=9729
https://www.raspberrypi.org/forums/viewtopic.php?f=72&t=33880
http://www.aholme.co.uk/GPS/Main.htm
http://abyz.co.uk/rpi/pigpio/index.html
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=52393
http://electronics.stackexchange.com/questions/47227/manchester-decoding http://www.piclist.com/Techref/io/manchester.htm
http://forum.arduino.cc/index.php?topic=214436.0
http://www.dsprelated.com/showthread/comp.dsp/126806-1.php
David Pilling's Wiki
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