title: How to calculate the stroke rate of a rowing boat using an iPhone?
body: <p>I would like to know the best way to attack calculating the stroke rate of a person rowing in an actual row boat. I would like to know what sensors would be best for measuring the typical boat acceleration cycle encountered in rowing, or is there a better way of approaching such a event.</p>
  
  <p>I figure I have to worry about X,Y,Z axis of the phone as its on the boat. So ignore the Z axis and only worry about X or Y depending how the phone is positioned on the boat.</p>
  
  <p>What sensors or frameworks should I use to measure such a movement?</p>