Dustin House ∙ Chris Moorman John Mouser ∙ Brian Neill ∙ Jack Skinner Advisors: Dr. Juliet Hurtig Dr. John-David Yoder A Self-Tuning Acoustic Guitar

Defining own sound Creating tuning schemes Difficulty with accurate tuning String breaks during a performance Existing tuning methods require the user to do all of the work Problem Identification

Recognition of a plucked string Fundamental frequency is recorded The tension in the string is adjusted to obtain the desired frequency Motor is used to turn the tuning peg System Overview

Transducer Motorola 56F826EVM DSP Board MC68HC12 Microcontroller LCD, Keypad, and LEDs Servo Motor Spur Gears Components

Hardware

Software

Capturing Note  Hexaphonic Pickup  Microphone Servo Control Voltage Regulator Power Supply User Interface Electrical System

User Interface

FFT Comparison

Mechanical System

SERVO MOTOR

Mechanical System SERVO MOTOR GEARS

Mechanical System SERVO MOTOR GEARS TUNING PEG

Project Expenses PartTotal Ribbon Cable$5.00 LCD$19.89 Servo Motor$6.95 Keypad$16.95PartTotal Microcontroller$ DSP Board$ Gears (2)$30.00 Miscellaneous Parts$ Table 1. Component Budget Prototype Cost$ Cost of Engineering Time$22,500 Total$23,129.79

Results Electrical design completed  User interface  Hardware for servo control  Power supply Mechanical system implemented  System mounted  Gear cover

Results Software design  Keypad, LED indicators and LCD  Motor control Issues with servo motor control  Accuracy  Consistency in tightening

Tightening string  Gear binding  Torque rating Frequency detection code  Writing to flash memory  Meshing with completed code Various tuning schemes Future Considerations

Dr. Juliet Hurtig Dr. John-David Yoder Dr. Les Thede Dr. Khalid Al-Olimat Dr. Srinivasa Vemuru Mr. Brad Hummel Acknowledgements

Questions?