The Boldport Cordwood has six LEDs. Six is one of my favourite numbers .. like the number of strings on a standard guitar.
So is it possible to use the Cordwood to detect (even tune) the six strings of a guitar?
I was thinking about doing a complete analog solution with bandpass filters (probably active filters in order to get very tight passband frequencies). Maybe later, but to start I wanted to try an Arduino-based approach with an electret pre-amp straight into the AVR with a little signal processing in software.
All the details of the design and how it works are available in my little electronic projects GitHub repo (it is basically my open lab notebook, with a catalog of over 400 projects now).
Here's a quick demo of the tuner in action:
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