Here I want to define the project phases

- Collect a few Arduino shields for testing and to make the pinout as compatible as possible (I've Pololu Zumo robot, Seeedstudio Starter shield, Freescale sensor shield, an Ethernet and a MP3 shield already on hand)

- Design a power supply what is flexible enough to handle the 3.3V and the 5V requirements. I think about the following:

Power sources:

1. Launchpad's 3.3V (3.6V ?)

2. USB connector on the booster pack

3. External power connector on the booster pack (let say 3V-15V ?)

Automatic switching between the sources

- Handle the level shifting requirements between the 3.3V and the 5V (also on I2C and maybe on analog side)

- Handle the pin shortage - The MSP430G2553, what I intend to use only has 16 usable data pins. It looks like this will not be enough for some of the Arduino shields. I want to use some I2C or SPI based bus extender to handle this.