Looking for a Tiny, Low RPM Motor for a Digital Guitar Tuner? Help Needed!

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A user is seeking a tiny, low RPM motor for a digital guitar tuner that can tune strings with minimal touch. The ideal motor should operate on 5V, be reversible for tuning adjustments, and come with guidance on motor basics. Stepper motors are suggested due to their controllability, though they require additional equipment and may not operate efficiently at 5V due to power limitations. The discussion highlights the need for a low-speed, high-torque motor to handle the tension of guitar strings. Overall, finding a suitable motor that meets these specifications is crucial for the project’s success.
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Hello all. As a Digital project, I'm trying to construct a digital guitar tuner that will actually tune the guitar for you, all you have to do is put the device on the tuner and pluck a string. My problem is I'm not very mechanically inclined...

Does anyone know a tiny hobby motor with a very low RPM (it only takes the slightest touch usually to tune a guitar). It'd be nice if it ran off of 5V (so I can get the digital components and motor off the same supply), reversibile (for tuning up and down), and some kind of guide for motor basics?? If this exists can you point me in the right direction?
 
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If ever there was an application for a stepper motor...The controlability is exactly what you are looking for. However, the drawback is the equipment required to operate one.
http://en.wikipedia.org/wiki/Stepper_motor
http://www.eio.com/stepindx.htm
http://www.solarbotics.net/library/pdflib/pdf/motorbas.pdfYou definitely would want something low speed and high torque. I can't say that I have ever heard of one running off of 5V though. You wouldn't have much power available to turn a tuning peg that has a tensile load due to string tension. I think you may have to concede that design point.
 
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stepper motor are easiest to control though the interface is a bit complex
 
Thanks, looks like exactly what I was looking for! Appreciate it!
 
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