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136  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: arduino RPM meter for laser project on: July 15, 2006, 07:02:50 am
Hello Tomas,

You have to use an external interruption. Look at http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1147164546, link is in french but you can understand code. In summary, the SIGNAL(SIG_INTERRUPT0) function is called each time the state of the digital digital change.
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