The USB Hourglass – This is a Great USB-Desk-Candy Gadget.
Submitted by Amaete Umanah on Thursday, 24 December 2009No Comment
It watches falling sand in an hourglass with an optical sensor. That data is sent via the Arduino USB output to the PC where it’s analyzed. This entropy is useful for all your random number needs. My favorite part: when the hourglass runs dry a servo motor flips it over and it starts again.With the USB Hourglass, the user can look at the sand falling through the center of the hourglass and monitor the randomness in the USB output data. And one can read the code line-by-line, compile it, and upload it to the microcontroller using only open-source and widely supported tools.
USB Hourglass from alwynallan on Vimeo.
