1. Senior Design I Mid Semester Presentation October 9, 2014

2. John Corn EE Alex Gibson EE Jordan Klein CPE Shane Reeves EE – Team Leader Dr. Koshka Team Advisor Team

3. Problem/Market System Overview Review of Subsystems Progress Timeline Outline

4. Guitar interfaced synthesizers are virtually nonexistent No guitars with lasers on the market Market towards all musicians Economic Practical Constraint: The Guitar must not cost more than $500. Market

5. Microcontroller Lasers Power Supply Fretboard Finger Positioning Synthesizer Systems

7. DeviceProsCons Arduino Due -84MHz CPU speed -2 DAC I/O pins -12 Analog I/O pins Arduino Mega2560 -Currently owned -16 Analog I/O pins - 16MHz CPU speed Microcontroller Audio Latency Technical Constraint: The processor must detect a broken beam and output sound within 50ms.

8. Photodiodes must detect light wavelengths between 500nm and 600nm. Light Detection Technical Constraint: Photodiodes [2]

9. Lasers [3] 30mW Green Laser Module Wavelength: 532nm Operating Voltage: 3V Operating Current: 360mA Health and Safety Practical Constraint: The laser beams must be safe to the touch under normal operational conditions.

10. Power Supply [4] DeviceQuantityVoltageCurrentTotal Current ( Three Hours ) Laser123 V360 mA12960 mA Microcontroller17 - 12 V50 mA150 mA Synthesizer13.3 V18 mA54 mA Battery27.4 V6600 mAh13200 mAh

11. Fretboard Finger Positioning TechnologyProsCons Membrane Potentiometers - Easy to implement - Stable operation - Expensive ($25 x 6) - Not visually appealing Capacitive Sensing - Visually appealing - Inexpensive - Difficult to implement - Requires significant calibration Laser Time-of-Flight - Visually appealing - Precise measurements - Extremely Difficult to implement

12. Capacitive Sensing A simple RC circuit is used One plate of the capacitor is formed by a metal contact on the guitar and the other plate is formed by the finger of the player The time it takes for the Receive pin to read HIGH after the Send pin has been set HIGH will vary based on changing capacitance Metal Contact Player’s Finger ~

13. Capacitive Sensing A simple RC circuit is used One plate of the capacitor is formed by a metal contact on the guitar and the other plate is formed by the finger of the player The time it takes for the Receive pin to read HIGH after the Send pin has been set HIGH will vary based on changing capacitance

14. Capacitive Sensing The 22 frets on the guitar will be used as the metal contacts Capacitive sensing begins when a laser beam on the neck of the guitar is broken

15. How Does a Synthesizer work? By combining multiple sine waves and adjusting amplitude, a synthesizer can create a new waveform. Synthesizer

16. TechnologyProsCons Arduino Synth Library -Easy to implement -Open source -Limited Functionality SAM2695 Synthesizer -Extensive sound library -Onboard effects -Difficult to implement

17. The SAM2695 has functions for 128 instruments that support over 100 notes. This will function like a keyboard that has multiple instrumental settings. Synthesizer – SAM2695

18. Capabilities: 64-voice polyphony (without effects) 38-voice polyphony + effects On-chip CleanWave™ wavetable data, firmware, RAM delay lines Synthesizer – SAM2695

19. [6] SAM2695 -Low power single chip synthesizer with effects and built-in codec 48 pin package

20. Synthesizer – SAM2695 What is a codec? A codec takes data and compresses/decompresses it so it can be transferred/received faster. Data Codec Data

21. Progress Formulated overall approach Lasers and photodiodes ordered and received Capacitive sensing tested Laser detection via photodiodes tested SAM2695 synthesizer chip ordered Issue with laser overheating resolved

22. Progress – Overheating Lasers

23. Progress – Pulsing Lasers

24. Timeline

25. [1] Available: http://arduino.cc/en/Products.Compare [2] Available: http://advancedphotonix.com/wp-content/uploads/PDB-C142.pdf [3] Available: https://www.dx.com/p/30mw-532nm-green-laser-module-3v-11-9mm-26888 [4] Available: http://www.all-battery.com/li-ion1865074v6600mahrechargeablebatterymodulewithpcb.aspx [5] Available: http://makezine.com/projects/make-35/advanced-arduino-sound-synthesis/ [6] Available: http://www.dream.fr/pdf/Serie2000/SAM_Datasheets/SAM2695.pdf References

26. Senior Design I Mid Semester Presentation October 9, 2014