Plan B:

A simplified modular MP3 player, containing:

• A "main" module, which contains the Arduino, buttons, a battery, and the MP3 decoder. This will function as a standalone MP3 player without any other modules.
• A "speaker" module, which plugs into the "main" module. This will allow for listening to music without requiring headphones.

The parts that I removed from Plan A are (in order of complexity):

• An "LED" module, which acts as a flashlight.
• A "Remote Control" module, which transmits television remote codes using Infrared.
• A "display" module, which upgrades the player from the equivalent of an iPod Shuffle to an iPod Classic.
• A standard connector so the modules can be connected in any configuration.

Timeline:

• July 28 - July 31:
• Parts arrive.
• Finish Lab 5 and work on Lab 6.
• Documentation: POV, Verplank Diagram, prototype, state diagram 
• August 1 – August 5:
• Build a working prototype on breadboards.
• Put each module on a different breadboard and minimize the number of wires running between breadboards.
• Minimize the number of components per board as much as possible, and test power consumption.
• Documentation: process
• August 5 - August 12:
• Move the parts off the breadboard.
• They may either be put onto perfboard or soldered directly.
• Put the parts into their plastic cylindrical enclosure.
• Add electrical connectors to each module.
• Test functionality with different modules.
• Documentation: process, code 
• August 12 - August 15:
• Debug/test.
• Documentation: video
• Finish documentation.