SERENADE MP3 PLAYER

The Hardware Perspective

By: Jacob Messick, Marcel Deslauriers, Brendan Simpson, & Nick Miller

Acknowledgements

•Craig Damon - Guidance •Michael Marceau - Guidance •Barry Woodworth - Help in Shop•Andy Child - Parts Management •BAMC - Technical Support

Table of Contents

• System Diagram• Hardware Description

• Main Controller• Power Management• User Interface

• Software Description• Beethoven Program• LCD• Audio Graphical EQ

• Work Distribution • Bill of Materials

System Diagram

MCUATmega32U4

Audio CodecVS1003

HostPC

µSD Card

LCD

HID:Tactile Buttons

SPI

Serial

GPIO

Hardware Description

• Five Major Components• Milled Aluminum Case • Atmega32U4 Microcontroller• VS1003 Audio Codec• 4DSystems µLCD-144 Graphical LCD System• Power Management System

Case Design

• Milled aluminum • Three pieces:

• Back panel• Front panel • Sidewalls

• Cutouts:• LCD/ Buttons• Audio Jack • USB

ATMega32U4

• Coordinates all peripheral functions between chips

• Manages SPI communication with µSD card and VS1003

• Manages USB connection

• Manages information serving to LCD

• Operates at 8MHz @ 3.3V

Audio Codec VS1003

• Decodes MP3 &WMA• SPI Control • High Quality on chip Stereo

• 18-bit DAC• Integrated DSP core provides advanced features such as pitch control

• Requires 3 voltage domains (3.3, 2.85, 2.7) and runs at 12.288MHz

Micro-Codec SPI Communication

Microcontroller(Master)

MISOMOSISCK

GPIO1GPIO2GPIO3GPIO4GPIO5

Vs1003(Slave)

SOSISCLKxRESETDREQxCSxDCS

LCD – 4D Systems LCD

• 128x128 Color LCD• µSD card storage• 10KiB of flash memory program

storage• 510 bytes of RAM for program

memory• Integrated Graphics Processor• Interfaces via standard UART

(serial)

Lithium Polymer Battery

• Single Cell• High Energy Density• Good long term discharge rate

• Rechargeable • Works well under extreme conditions

Voltage Regulation

• Battery/USB power source

• 1 Switching boost regulator (LTC3203)

• 3 linear voltage regulators for localized voltage domains

Custom Hardware Design

• Atmega32U4• LCD Screen• Audio Codec

VS1003• SD Card • LiPo Battery • Power Management

Schematic Power Management

Micro

CODEC

Software Description• Microcontroller

• Simple interrupt driven runtime to serve user requests (button input)• Controls file streaming from the µSD to the VS1003• Sends inputs, the database, and status information about the current

song playing to the LCD

• LCD• Main GUI for the MP3 player• Uses the database to create menus as needed• Tells the microcontroller what song to play and volume level

• Beethoven Program• Media library• Music & database syncing• MP3 playback• Metadata editor

LCD: Menus

1. Main Menu

2. Song Navigation Menus

3. Current Song View

4. Now Playing Playlist

5. Settings

1 2

3 4

Beethoven

Audio EQ

Labview: Measurement & Control

Control Options

Stop/THD Measurement

Right & Left RMS Voltage Measurement

Work Distribution

Bill Of Materials

Demo

Summary• System Diagram

• Case • Micro-Codec Communication• Hardware Description

• Schematic • Codec• Power Management • Micro

• Software • LCD menus • Syncing program • Audio EQ

• Work Flow• Bill of materials • Demo

Power Management

CHARGE PUMP

Charge Controller

Power System Simulation

Power Management

Results

• .

• LCD Draws 220 mA when powered

• No Sleep/ Hibernate Mode

Current Draw On Battery (mA)

USB Power (mA)

On (No music) 265 265

Playing a song

280 280

Volume at 11 320 320

Battery Life Time Powered

On (No music) 3 Hours 46 Minutes

Playing a song 3 Hours 34 Minutes

Volume at 11 3 Hours 08 Minutes

Microcontroller

Codec