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Electric Air Ukulele

Electric Air Ukulele. Ivan Setiawan (setiawa2) Satyo Iswara (iswara2). ECE 445 Senior Design Spring 2012 Team #32 TA: Jane Tu. Objective. Implement a musical instrument that has a ukulele-like sound Simple , lightweight, and portable music instrument

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Electric Air Ukulele

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  1. Electric Air Ukulele Ivan Setiawan (setiawa2) SatyoIswara (iswara2) ECE 445 Senior Design Spring 2012 Team #32 TA: Jane Tu

  2. Objective • Implement a musical instrument that has a ukulele-like sound • Simple, lightweight, and portable music instrument • Pre-calibrated strings that do not need adjustments • Inexpensive music instrument

  3. Features • Distance detection to determine hand positions • Sensitive sensor system • A wireless data transfer from the left to the right hands • Finger bending sensor simulating string picking motion

  4. Original Design and Final Design • Original Design • LED indicator to show if the distance is within the boundary • Build-in speaker with operational amplifier • Final Design • LED indicator is not implemented due to limited spaces of the box • Using commercial speaker provided in the lab

  5. Project Picture Left Hand Design Right Hand Design

  6. Power Power RF Receiver Micro-controller B Flex Sensor Fret Indicator Fret Pressure Sensor Micro-controller A Speaker Proximity Sensor RF Transmitter Block Diagram Left hand Right hand

  7. Device Overview Left Hand • 4 potentiometers • Proximity sensor • Arduino Uno Microcontroller • RF Transmitter • Power Regulator

  8. Device Overview cont. Right Hand • 4 flex sensors • Arduino Uno microcontroller • RF Receiver • Speaker

  9. Fret Potentiometers • Variable resistance • Varies linearly from 1 kΏto 10 kΏ [1] Source: http://www.sparkfun.com/datasheets/Sensors/Flex/SoftPot-Datasheet.pdf

  10. Proximity Sensor • Narrow beam angle • Measure distance using ultrasonic pulse • Accurate within the range of 2cm to 3m • Has a blink LED indicator to indicate measurement

  11. RF Transceiver • 434 MHz frequency range • Able to transfer data of 4800 bps • Robust wireless data link transmission • Using VirtualWire library in Arduino platform

  12. Flex sensor • Variable resistor based on degree of bending • Use as voltage divider [2] source : http://www.sparkfun.com/datasheets/Sensors/Flex/flex22.pdf Vout [3] source : http://www.sparkfun.com/datasheets/Sensors/Flex/flex22.pdf

  13. Audio Output • Arduino output PWM digital signal • D/A conversion through low pass filter • The VoutDC offset then removed by blocking capacitor [4] source : http://en.wikipedia.org/wiki/Low-pass_filter

  14. Waveform Result RF Transceiver • Channel 1: Data transmitted • Channel 2: Data received • Generate a bit error at higher frequency value

  15. Waveform Result cont. Analog output to speaker digital PWM output D/A conversion Remove DC offset Attenuating over time

  16. Idle OFF Software Implementation ON Get Distance Left Hand NO Within boundary YES Determine fret location Interpret chords Transmit data

  17. Software Implementation cont. Get data from RX Right Hand N String pick? Y Enable interrupt subroutine Output to speaker N Sound decay? Y

  18. Challenge and Accomplishment • Challenge • Wireless connection between both hands • Output an ukulele-like sound through synthesizer • Accomplishment • Ability to send fret information via trans-receiver module • Successfully generate ukulele-like sound

  19. Improvement • Less delay in the system • More accurate distance sensing • RF transceiver with higher bps rate • Remove Arduino Uno platform to reduce cost

  20. Ethics • The device is designed to be safe; no hazard posed to user

  21. Acknowledgment • Prof. Scott Carney • Our TA : Jane Tu and Alex Suchko • All staff of ECE Electronic Service Shop Thank You

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