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Build a real bell-striking clock for your PC and a fire extinguisher-striking clock.
A brass bell, a small relay a few more things and a real bell can strike the hours on your desktop. Though this project runs on Windows and Mac OS X also, I idecided to install Ubuntu Linux on a PC I found in the trash and work on that : I had never worked with Linux before, I learned some Processing language and wrote a sketch to run an analog clock on it.