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I think everyone who plays guitar has thought vaguely about the automatic tuning. When I got the basic concept, everything seemed to be in my hands when I tried to make an automatic tune. Sensing of vibration and control of motor won't be matter to me, I was sure that I can make it in 3 months.
Unexpected problems and technical limitations have begun to hamper.
The most difficult of them was how to prevent the outbreak of Overtone. (Please check what is overtone at Wikipeida). When smart tuner reads overtone then it might break the strings. It is a huge contradiction because I was making auto tuner to prevent and keep to break strings. I couldn't solve this issue for over a year. I needed smart brain by myself.