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Maybe a gyro would be a better idea than two or more accelerometers but I remember reading on the spec sheet that gyros had a limited range of degrees.  Maybe this isn't always the case?  Could a gyro continuously monitor rotational speed on a rotating wheel or would this be impossible?   
 
Maybe a gyro would be a better idea than two or more accelerometers but I remember reading on the spec sheet that gyros had a limited range of degrees.  Maybe this isn't always the case?  Could a gyro continuously monitor rotational speed on a rotating wheel or would this be impossible?   
  
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The current system uses a series of small holes around the wheel rim and a small laser; a frequency to voltage converter sets a voltage level for the wheel speed and a comparator trips when the voltage passes a reference level; the output then triggers the analog switch.  It works OK but the circuit response is too slow for fast passages of music.
 
The current system uses a series of small holes around the wheel rim and a small laser; a frequency to voltage converter sets a voltage level for the wheel speed and a comparator trips when the voltage passes a reference level; the output then triggers the analog switch.  It works OK but the circuit response is too slow for fast passages of music.

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