frequency and period measurement for arduino, remix from:
http://www.avdweb.nl/arduino/hardware-interfacing/frequency-period-counter.html
FreqPeriodCounter Version 28-5-2013 Copyright (C) 2011 Albert van Dalen http://www.avdweb.nl
frequency and period measurement for arduino, remix from:
http://www.avdweb.nl/arduino/hardware-interfacing/frequency-period-counter.html
FreqPeriodCounter Version 28-5-2013 Copyright (C) 2011 Albert van Dalen http://www.avdweb.nl