This is my random number generator new favorite (old favorite: lava lamps):
It monitors falling sand in an hourglass with an optical sensor. These data are sent via the Arduino USB output to the computer where it is parsed. This entropy is useful for all your random number needs. My favorite part: when the hourglass runs dry a servomotor it tip over and it starts again.
Machine to Peter Allan, said:
With the USB hourglass, the user can watch the sand falling through the center of the hourglass and monitor the shuffle in the USB output data. And you can read the code line by line, compile it and upload it to the microcontroller using only open-source tools and widely supported.
USB hourglass
[Thanks, Scott Burris!]
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