TO92 is just a package type. It could be digital or analog, a complete sensor chip, or just a diode connected transistor.
It's possible to have the Arduino offload data to a PC (the PC doesn't even have to be on all the time - just often enough to empty the buffer) or you can add a SD card for increased storage.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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