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servos

Hi,

This may be a little obscure, but For a college project I am designing a self tuning guitar based on frequency detection of each string. I will use six hs-422 Hi-tec servos mounted in the body to adjust the tension of each string according to its frequency error.
I have checked that the torque associated with the servos match and exceed that required to adjust the string tesion.
Considering I am just in the planning stage of design I haven't quite figured out where to start!
The direction of a servo arm depends on the pulse width of an input signal sent via a conrol input.

Initially I need to design a frequency detection system that will determine the frequency of a string (perhaps after the string is struck). This frequency then needs to be compared with a set variable frequency. the difference between the two should then be used to send a signal to the control input of the servo and "tell" it to either increase or decrease the tension of the string according to the difference found.

I know this project will provide me with hours of fun (and stress probably), as my interests are in music and electronics! I have designed and built guitar pedals in the past and this project would serve as the proverbial icing on the cake.

Any help with any aspect of the project would be hugely appreciated as I hope to get stuck in as soon as possible!
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