Petrol Engine RPM Counting Using mike and Engine Sound Input ?

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dear sir,

i need count petrol engine rpm using engine sound part of college project. got following information; arduino based rpm counting. based on pick ignition coil. need using engine knock sound.

arduino car or motor bike engine rpm meter>> http://www.kokoras.com/rpmsparkplug/

so please give me link or information on kind of project. possible count number of engine piston knocks using engine sound , feeding mike analog input arduino , count rpm ?

i must thankful if kindly reply soon.

thanks.

i'd use accelerometer or piezo knock sensor. filtering may great part of project, manage measure heartbeat ucpu, on-line resources on topic jump-start point. 


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