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Old 01-30-2017 | 12:34 PM
  #5  
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dtr
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Joined: May 2011
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From: budapest, hungary
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I bet there are apps that measure rpm using your phone's mic.
Some pointers:
http://www.ymec.com/hp/signal2/motor1.htm
https://www.rcgroups.com/forums/show...and-microphone
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