Senior Design Project

“ MP3 Player ”Brian P. Allen

Zeeshan A. KhanJerry T. Koshy

Objectives What? – Create a portable MP3 player Why? – To integrate software with

hardware and implement our fundamental engineering knowledge.

MP3 Technology Introduction MPEG Audio Layer 3 File format Compressed Maintains quality Used for Music

Basic Steps of MP3 Player

Components Model

Selection Process Criterion Simplicity Economical Versatility Voltage Consistency Familiarity Compatibility Interfacing Ability

Microprocessor “Brain” Functions:

• User Input• Retrieves memory

data• Commands to DSP• Display Information

PIC16F877 key features Small instruction set (35) RISC Several I/O ports Operating voltage range (2.0v to 5.5v) Previous knowledge Low cost

PIC16F877 Pin Diagrams

Decoder

Functions:• Serial control • Decompression• Digital signal processing

VS1001k key features Single-chip solution Built-in DAC Built-in amplifier Handles MPEG layer 1, 2 and 3 audio 4kB built-in RAM Can handle variable bit rates

VS1001k Pin Diagram

VS1001k Block Diagram

Memory Functions

• Data Storage• Nonvolatile• Update data• Transportable• Increases data

capacity

Multimedia Card key features High storage capacities Non-volatile solid state No moving parts Fewer pins than other devices Low power consumption Low cost

MMC Pin Diagram

MMC Block Diagram

Other Parts Power Supply LED’s Switches Crystal SOIC-DIP converter Voltage Regulator 3.5 mm Audio Jack

MMC to PIC FAT file system USB 2.0 port SPI interface Master/Slave

GND

VCC

PIC DATA BUS

PIC Resets MMC & decoder SPI Commands Read memory sector Transfers data to decoder User Interface Display Interface

Decoder Data request Decoding Analog/Digital hybrid volume control DAC Stereo earphone driver

PIC to Decoder

Schematic

BudgetParts List  Component Quantity Price

PIC16F877 Processor 1  $8.00

VS1001k Decoder 1  $25.00

SanDisk Multimedia Card 1 $24.99 

Other Parts $30.00Total  $82.99

SchedulePhases:

1. Research & Component Selection

2. Preliminary Design & Ordering of Parts

3. Construction & Testing

Feb Mar Apr May Jun July Sep Oct Nov Dec

Phase 1Phase 2

Phase 3

Progress Completed: research, component

selection and purchase, and preliminary design.

Currently: programming microprocessor and constructing circuit.

MP3 player in the making (insert picture here)

The End