Eco-Friendly Wireless Optical Piano System
Explore an eco-friendly wireless piano system utilizing optical technology with minimal delay and wide applications for museums and classrooms. Learn about original design, modulation issues, system overview, and recommendations for future improvements.
Eco-Friendly Wireless Optical Piano System
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Presentation Transcript
Wireless Optical Piano Alex Crisci, Ryan Mancl, Evan Schrock December 1st, 2011
Agenda • Introduction • Original Design • System • Test & Verifications • Recommendations
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 • Analog Signal Processing • Signal already digital • Unnecessary complications • Optical Filters • Mixer • Amplifiers Original Block Diagram
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
MIDI Playing a middle C (C3) Voltage [V] 0011110 Time [us]
Opto-Isolator LED Schematic 1
LED Voltage [V] 100 Hz Tests Time [us] Voltage [V] Time [us]
Photodiode Voltage [V] Time [us]
Photodiode Voltage [V] Time [us] Voltage [V] Time [us]
Voltage Amplifier Schematic 2
Voltage Amplifier Gain – = 29.07 V/V Amplified Output [5.484 V] Voltage [V] Input Level [234 mV] Time [ms] Simulation 1
Signal Offset Correction Voltage [V] Time [us] Output of offset correction circuitry
Signal Stabilization Voltage [V] Time [us] Voltage [V] Time [us]
Overall receiver • MIDI Out • Roland SC-8850 PCM-based MIDI sound module 3.3k 910 220 Anode PD 220 Cathode Schematic 3
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 • 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? Thank You!
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>.
