In the likely scenario that we are unable to achieve chord recognition using FFTs, our backup plan is to use force sensitive resistors underneath the strings on the frets of the ukulele. These sensors would act like switches which would be activated when pressed, and the chord would be identified based on the state of the each of the sensors, as conceptualized in the following images.
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| Basic major chord diagram. Shows which of the basic major chord formations overlap. |
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| Possible Boolean logic equations to identify chord based on state of force/pressure sensors. Topological issues, namely the proximity of the sensors on the same fret under adjacent strings, were considered in determining the optimal logic scheme. We are planning on purchasing these force sensitive resistors: http://www.sparkfun.com/products/9673 |
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