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My project is a programmable strobe controller for high speed photography. A device like this is crucial for many types of high-speed photography, as it can orchestrate multiple sensors such as photogates and contact microphones with several outputs, such as a flash trigger and a camera's shutter release, so as to capture a photograph of just the exact right instant with microsecond precision. An example; I connected my device to a small electronic water valve, to my camera's cable release port, and to a flash. I arranged it so water could flow down from a bottle, through the valve, out a

He has been featured a few times again too including today http://hackaday.com/2010/11/15/girltech ... crome-lcd/ and his maze game http://hackaday.com/2010/11/11/dungeon- ... /#comments

Yea, the I2C Explorer has a bus-pirate like way of communicating from a pc through the uart to an i2c bus. It uses the builtin USI of the msp430G2231 to handle receiving and transmitting. It is nearly exactly what the TI description of how to use the USI for I2C master shows, put in C code. MSP430 Family Guide with USI description (PDF Page 449): http://focus.ti.com/lit/ug/slau144e/slau144e.pdf What you want is USI Slave though. It does not implement that. TI has great USI Slave examples that run on the msp430g line (I have not personally tried them). TI also has a precreated I2C USI

First of all, how many do you plan on using? Second, resistors on leds are primarily for current control, as an led will pull as much current as it can, and burn out if it pulls too much. Voltage control is secondary. Next, do you plan on driving each at full brightness/current? They are listed at 20ma. If you power them directly from the msp430 at 20ma, the voltage will drop between 2.7 (5ma) and 2.5 volts (25ma), which might not be enough to turn on the led. From a TI forum post, not specifically about the launchpad/valueline msp430s, but similar (and the valuelines act the same) h