How do you measure the duty cycle of sinus with a arduino uno?

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my school project measure frequency output buzzer. manufacture buzzer pui audio inc type number ai-2604-tt-r. minimal frequency output specification 400hz(+-100hz) located in datasheet buzzer.
link datasheet: http://datasheet.octopart.com/ai-2604-tt-r-pui-audio-datasheet-17019779.pdf

iam using microphone record sound signals buzzer. using pre amplifier circuit amplify out coming signal. signal input ardruino(analog input).

kind regards,
dennis

quote from: unkown21 on may 15, 2014, 01:40 pm

my school project measure frequency output buzzer.


that sounds fun.

what have done far?



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