Electronic Drum Set

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Electronic Drum Set

• Zachary Dziczkowski EGRE 631 Dr. Tucker

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Whats the Difference
Acoustic Set
Electronic Set
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Sound Processing

• Pintech RS-5
• Piezoelectric Transducer

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Sound Processing

• Pearl MFH Mesh Drumheads

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Sound Processing

• Drum Module

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My Design
Sensor
Amplifier
Drum Module
RS-5
University DC
Computer
UART, A/D
Java
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Drum Trigger

• Piezoelectric Transducer
• RS-5
• ¼ Jack

Sensor
RS-5
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University DC

• Used ADC1 to read sensors
• Problems with ADC0
• Used UART1 to send data to computer
• Problems with UART0

Drum Module
University DC
UART, A/D
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Configuring ADC1

• Used ADC1 to read sensors
• ADC1 can be connected to Port 1
• 8-channel
• 8-bit
• 500ksps

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Configuring ADC1

• Setting up ADC1
• Set Port 1 to analog input.
• Set P1MDIN to 0x00
• Tell Timer 3 to use the system clock
• Set TMR3CN to 0x00
• Initialize Timer 3 with a value
• Enable Timer 3
• Set TMR3CN to 0x04
• Set the reference voltage for ADC1
• Tell the mux which input to read first
• Set AMX1SL to 0x00

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Configuring UART1

• Used UART1 to send data to computer
• UART1 can be connected to Port 0
• Uses Timer 4
• Mode 1, Asynchronous, 10-bit
• 115,200 Baud

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Configuring UART1

• Setting up UART1
• Set crossbar to output UART1 to P0
• Set XBR2 to 0x44
• Tell Port 0 to be digital ouputs
• Set P0MDOUT to 0xF0
• Tell UART1 to use Timer 4
• Set T4CON to 0x30
• Initialize Timer 4 to the appropriate value for
  the Baud rate.
• Enable Timer 4
• Tell Timer 4 to run off of the system clock
• Or CLKCON with 0x40

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Configuring UART1

• Setting up UART1, continued
• Tell UART1 to run in Mode 1
• Set SCON to 0x50

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Command Specs

• A (0x41) Trigger 1
• B (0x42) Trigger 2 (unimplemented)
• C (0x43) Trigger 3 (unimplemented)
• and so on
• Eventually, Java program sends back an ACK,
  perhaps.

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Computer

• Responsibilities
• Read data from Microprocessor
• Load/Play appropriate WAV
• Amplify output

Amplifier
Computer
Java
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Java Program

• Algorithm
• Initialize serial communication
• Initialize WAV player
• Listen for data on serial line
• Read command
• Play corresponding WAV file

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Final Prototype
University DC
Scope Probe ?
RS-232 Line Driver
RS-5 Transducer
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Issues

• UART0
• Electromagnetics
• Ugh
• Redundant Data
• Sensor Sensitivity is too high
• Ways to mitigate this?
• Deploy Design
• Use the University DC, PIC
• Serial Communication
• Move to USB

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Future Work

• Add seven more sensors
• Move to USB
• Construct frame to support drums.
• Increase usability of GUI

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Questions?

• REFERENCES
• I. Silicon Laboratories. (2009, Mar.)
  C8051F020/1/2/3. PDF Datasheet. I.
• Microchip Technology. (2007) PIC18F2455/2550/4555/
  4550 Datasheet. PDF Datasheet. (2009)
• Pintech Electronic Percussion. Online.
  http//www.pintechworld.com/shop/scripts/prodView/
  asp?product100 (2009, Apr.)
• RXTX serial and parallel I/O libraries
  supporting Sun's CommAPI. Online.
  http//rxtx.org (2009)
• Java Sound API. Online. http//java.sun.com/prod
  ucts/java-media/sound/ (2009)
• Java Communications API. Online.
  http//java.sun.com/products/javacomm/ (2003,
  Aug.)
• jUSB for Windows 2000/XP Project. Online.
  http//www.steelbrothers.ch/jusb
• I. Tektronix, TDS1000B and TDS2000B Series
  Digital Storage Oscilloscope User Manual.
  Beaverton, United States, 2009.