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Senior Design I Mid Semester Presentation October 9, 2014 Team John Corn Alex Gibson Jordan Klein Shane Reeves Dr. Koshka EE EE CPE EE – Team Leader Team Advisor Outline • Problem/Market • System Overview • Review of Subsystems • Progress • Timeline Market • 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. Systems • • • • • Microcontroller Lasers Power Supply Fretboard Finger Positioning Synthesizer Microcontroller Audio Latency Technical Constraint: The processor must detect a broken beam and output sound within 50ms. Device Pros Cons 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 Photodiodes Light Detection Technical Constraint: Photodiodes must detect light wavelengths between 500nm and 600nm. [2] [2] Lasers 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. [3] Power Supply Device Quantity Voltage Current Total Current ( Three Hours ) Laser 12 3V 360 mA 12960 mA Microcontroller 1 7 - 12 V 50 mA 150 mA Synthesizer 1 3.3 V 18 mA 54 mA Battery 2 7.4 V 6600 mAh 13200 mAh [4] Fretboard Finger Positioning Technology Pros Cons 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 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 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 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 Synthesizer How Does a Synthesizer work? By combining multiple sine waves and adjusting amplitude, a synthesizer can create a new waveform. Synthesizer Technology Pros Cons Arduino Synth Library -Easy to implement -Open source -Limited Functionality SAM2695 Synthesizer -Extensive sound library -Onboard effects -Difficult to implement Synthesizer – SAM2695 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 Capabilities: • 64-voice polyphony (without effects) • 38-voice polyphony + effects • On-chip CleanWave™ wavetable data, firmware, RAM delay lines Synthesizer – SAM2695 48 pin package [6] SAM2695 -Low power single chip synthesizer with effects and built-in codec Synthesizer – SAM2695 What is a codec? Data Codec Data A codec takes data and compresses/decompresses it so it can be transferred/received faster. 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 Progress – Overheating Lasers Progress – Pulsing Lasers Timeline References [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 Senior Design I Mid Semester Presentation October 9, 2014
