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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

Wireless Optical Piano

Alex Crisci, Ryan Mancl, Evan Schrock

December 1st, 2011

agenda
Agenda
  • Introduction
  • Original Design
  • System
  • Test & Verifications
  • Recommendations
introduction
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

original design
Original Design
  • Analog Signal Processing
    • Signal already digital
    • Unnecessary complications
  • Optical Filters
  • Mixer
  • Amplifiers

Original Block Diagram

modulation issues
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
slide7
MIDI

Playing a middle C (C3)

Voltage [V]

0011110

Time [us]

opto isolator
Opto-Isolator

LED

Schematic 1

slide9
LED

Voltage [V]

100 Hz Tests

Time [us]

Voltage [V]

Time [us]

photodiode
Photodiode

Voltage [V]

Time [us]

photodiode1
Photodiode

Voltage [V]

Time [us]

Voltage [V]

Time [us]

voltage amplifier1
Voltage Amplifier

Gain – = 29.07 V/V

Amplified Output [5.484 V]

Voltage [V]

Input Level

[234 mV]

Time [ms]

Simulation 1

signal offset c orrection
Signal Offset Correction

Voltage [V]

Time [us]

Output of offset correction circuitry

signal stabilization
Signal Stabilization

Voltage [V]

Time [us]

Voltage [V]

Time [us]

overall receiver
Overall receiver
  • MIDI Out
    • Roland SC-8850 PCM-based MIDI sound module

3.3k

910

220

Anode

PD

220

Cathode

Schematic 3

recap
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
recommendations
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
questions
Questions?

Thank You!

works cited
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>.