Electronic Drum Set Zachary Dziczkowski – EGRE 631 – Dr. Tucker.

Electronic Drum Set

Zachary Dziczkowski – EGRE 631 – Dr. Tucker

What’s the Difference

Acoustic Set Electronic Set

Sound Processing

Pintech RS-5 Piezoelectric

Transducer

Sound Processing

Pearl MFH Mesh Drumheads

Sound Processing

Drum Module

My Design

RS-5University DC Computer

Sensor Drum Module Amplifier

UART, A/D Java

Drum Trigger

Piezoelectric Transducer RS-5

¼” Jack

RS-5

Sensor

University DC

University DC

Drum Module

UART, A/D

• Used ADC1 to read sensors

• Problems with ADC0

• Used UART1 to send data to computer

• Problems with UART0

Configuring ADC1

• Used ADC1 to read sensors

• ADC1 can be connected to Port 1

• 8-channel

• 8-bit

• 500ksps

Configuring ADC1

• Setting up ADC1

1. Set Port 1 to analog input.

• Set P1MDIN to 0x00

2. Tell Timer 3 to use the system clock

• Set TMR3CN to 0x00

3. Initialize Timer 3 with a value

4. Enable Timer 3

• Set TMR3CN to 0x04

5. Set the reference voltage for ADC1

6. Tell the mux which input to read first

• Set AMX1SL to 0x00

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

Configuring UART1

• Setting up UART1

1. Set crossbar to output UART1 to P0

• Set XBR2 to 0x44

2. Tell Port 0 to be digital ouputs

• Set P0MDOUT to 0xF0

3. Tell UART1 to use Timer 4

• Set T4CON to 0x30

4. Initialize Timer 4 to the appropriate value for the Baud rate.

5. Enable Timer 4

6. Tell Timer 4 to run off of the system clock

• Or CLKCON with 0x40

Configuring UART1

• Setting up UART1, continued

7. Tell UART1 to run in Mode 1

• Set SCON to 0x50

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.

Computer

Responsibilities

1. Read data from Microprocessor

2. Load/Play appropriate WAV

3. Amplify output

Computer

Amplifier

Java

Java Program

Algorithm

1. Initialize serial communication

2. Initialize WAV player

3. Listen for data on serial line

1. Read command

2. Play corresponding WAV file

Final Prototype

RS-5 Transducer

RS-232 Line Driver

University DC Scope Probe

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

Future Work

Add seven more sensors

Move to USB Construct frame to

support drums. Increase usability of

GUI

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?product=100 (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/products/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.