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Peripheral Interpreter consisting of Analyzers 'N
Operators
P.I.A.N.O.
Team Members Course Instructor Curtis Hayes Dr. Serpen Matthew Huie Eric Lauber Faculty Advisor Wesley Vollmar Dr. Molyet
P.I.A.N.O.Project Team
Background (Problem)• Player pianos are expensive• Obtrusive internal modifications of piano• Musicians are expensive• Musicians may not know and be ready to
perform all genres of songs
Background (Solution)• Play the piano autonomously via computer
software• Do not modify or damage the piano• Be contained and unobtrusive• Use modular design to be scalable• Be cost effective and easy to use
Background (cont.)• Uses existing technologies
oPWM (Pulse Width Modulation)oMIDI (Musical Instrument Digital
Interface)• Use knowledge gained through University
educationoComputer ProgrammingoElectrical Hardware Design
• Actuatorso Dual Ledex Solenoidso Together pull up to1.3A @ 28V
• Switched Electronic Controlo PWM to create Dynamic
Variation and Human-Like Playback (Honors)o Use different PWM duty cycles to reduce heating
losses • Power Supply (28V)
Driving Circuitry
Pulse Width Modulation
Pulse Width Modulation
• Serial Bus• One Master, Multiple Slaves
Master/Slave Architecture
Arduino Overview
• ATMEGA328• On-board
o Microprocessoro 328K Memoryo I/Oo PWMo Analog Inputs
• Programmed in Co void setup()o void loop()
Hardware Block Diagram• Serial Communication• DIP Addressing• PWM to solenoid drivers
Hardware Slave Schematic
Software - Input Parsing
• Reads in a single track MIDI file• Pulls out relevant information
o Noteso Delayso End of Song
• Throws away meta-data, except tempo changes • Stores into database
• Must be done very carefully to prevent corruption
of the data.
Software - Output Control Signals
• Read in command signals from database in array• Calculate "tick" time• Run timing delays• Output command signal on serial port• Repeat
• Fast enough to simulate chords
Software - Serial Communication
• Using a Universal Serial Bus (USB) to RS232R (TTL logic levl) converter
• Software uses the built in .NET Serial Port object• Can be written to like any file object
Software - Graphical User Interface• Simple, clean style• Similar to most other media players• Custom buttons to customize
our system• Functions separated on
different windows• Custom icon to identify the
program
Software - Database• System.Data.SQLite ADO.NET provider
o http://www.sqlite.org/o "Most widely deployed SQL database engine in the
world"o Used in systems such as Mozilla Firefox
• All data stored in one single file• Simple Transaction SQL commands• Requires only file path to access
Software - Database Repair
• Two Redundant backups storedo Created at system close
• Can repair corrupted database at error• Protects against data loss
Software - Import / Export
• Wes Vollmar's Honors portion of the project• Ability to export and share database contents• Replace or append to current playlist• Gives system mobility
- - - -
Future• Scale up to full sized piano
o Invest into more key modulesoMass produce using printed circuit
boards (PCBs)• Communicate with other MIDI devices• Add other music file functionality
Conclusion• One octave self playing piano• Software controlled• Solenoid key striking modules• Easy maintenance and repair• Self contained
QUESTIONS?
References• Atmel - ATMega328P
o http://www.atmel.com/dyn/products/product_card.asp?PN=ATmega328P#dataSheets
• Ledex 191172-001o http://www.jameco.com/webapp/wcs/stores/servlet/Produ
ctDisplay?langId=-1&storeId=10001&catalogId=10001&productId=1919203
• Texas Instruments - DRV102o http://focus.ti.com/docs/prod/folders/print/drv102.html
