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Wireless Optical Piano

Wireless Optical Piano. Alex Crisci , Ryan Mancl , Evan Schrock December 1 st , 2011. Agenda. Introduction Original Design System Test & Verifications Recommendations . Introduction. Eco-friendly wireless transmission Multi-benefit system Minimal delay Bandwidth availability

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Wireless Optical Piano

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  1. Wireless Optical Piano Alex Crisci, Ryan Mancl, Evan Schrock December 1st, 2011

  2. Agenda • Introduction • Original Design • System • Test & Verifications • Recommendations

  3. Introduction • Eco-friendly wireless transmission • Multi-benefit system • Minimal delay • Bandwidth availability • Wide range of applications • Museum exhibit • Classroom hearing assistance http://www.hotwaves.net/wp-content/uploads/2011/08/Haas-TED2.jpg Harald Haas during a TED talk

  4. Original Design • Analog Signal Processing • Signal already digital • Unnecessary complications • Optical Filters • Mixer • Amplifiers Original Block Diagram

  5. Modulation issues • Proposed Scheme • Digital Encoding • CDMA Based • 4:1 bit encoding • Why didn’t we use modulation • Signal was already digital • Simple design for cheaper implementation • Eliminate delay for real-time music playback • Achieved a fast enough signal without the PIC

  6. System Overview

  7. MIDI Playing a middle C (C3) Voltage [V] 0011110 Time [us]

  8. Opto-Isolator LED Schematic 1

  9. LED Voltage [V] 100 Hz Tests Time [us] Voltage [V] Time [us]

  10. Photodiode Voltage [V] Time [us]

  11. Photodiode Voltage [V] Time [us] Voltage [V] Time [us]

  12. Voltage Amplifier Schematic 2

  13. Voltage Amplifier Gain – = 29.07 V/V Amplified Output [5.484 V] Voltage [V] Input Level [234 mV] Time [ms] Simulation 1

  14. Signal Offset Correction Voltage [V] Time [us] Output of offset correction circuitry

  15. Signal Stabilization Voltage [V] Time [us] Voltage [V] Time [us]

  16. Overall receiver • MIDI Out • Roland SC-8850 PCM-based MIDI sound module 3.3k 910 220 Anode PD 220 Cathode Schematic 3

  17. Recap • Successful transmission of 33kHz signal via LED • Modularity for use with other signals • “Always on” light can be used for lighting and communication • Avoids over-crowded radio frequencies

  18. Recommendations • Increasing distance between source and receiver • Receiver power supply • Better light filtration after using better light source • Tying system into a room • Expansion to other data types

  19. Questions? Thank You!

  20. Works Cited • "About General MIDI." MIDI Manufacturers Association - The Official Source of Information about MIDI. Web. 9 Oct. 2011. <http://www.midi.org/techspecs/gm.php>. • Dragic, Peter. "Wireless Optical Transmission." Personal interview. 31 Oct. 2011. • "Electrical Specification for MIDI." MIDI Manufacturers Association - The Official Source of Information about MIDI. Web. 9 Oct. 2011. <http://www.midi.org/techspecs/electrispec.php>. • Haken, Lippold. "Future Possibilities for Wireless MIDI." Personal interview. 11 Oct. 2011. • "Harald Haas: Wireless Data from Every Light Bulb | Video on TED.com." TED: Ideas worth Spreading. Web. 26 July 2011. <http://www.ted.com/talks/harald_haas_wireless_data_from_every_light_bulb.html>. • "MIDI Specification." GweepNet : The GweepCo Cooperative Network. Web. 23 Sept. 2011. <http://www.gweep.net/~prefect/eng/reference/protocol/midispec.html>.

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