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http://blog.radioartisan.com/arduino-antenna-tuner
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http://www.arduino.cc/blog
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http://www.dutchtronix.com/Arduino-ClockShield.htm
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https://github.com/esp8266/Arduino
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http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1210243556
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http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1197235191
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http://interface.khm.de/index.php/lab...nts/arduino-frequency-counter-library
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http://allthemods.com/project.php?id=342&page=2
(power down mode)
http://interface.khm.de/index.php/lab/experiments/sleep_watchdog_battery