The platform is TinyOS. It periodically samples the photo sensor and displays the highest 3 bits of the raw ADC light reading to the LEDs, with RED being the most signficant bit and YELLOW being the least significant bit.

Packet : 53607919sense.rar filelist
Sense\Makefile
Sense\README
Sense\Sense.nc
Sense\SenseM.nc
Sense

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