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==== Software ==== Though we are using arduino compatible hardware, we are using AVR-GCC to compile native code directly for the atmel mega168 chip on the boarduino. The arduino framework does not perform well enough nor allow us good access to the atmega168 integrated chip features such as SPI and TWI. We are using lady ada's arduino bootloader. This acts like an atmel stk500 programmer, and allows us to upload software over the wireless connection. The XBEE wireless chip has virtual transparenet pins configured so we can control the reset pins of the two boarduinos independently, and upload new code to each half of the sign at a time. The two halves talk to each other using the TWI interface on the atmega168.
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