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Made with an Arduino Nano and a 7-segment display, which uses the MAX7219 chip to multiplex all the LEDs for me. And a whole lot of hacky soldering.

It reads capacitative touch on the top and displays the value * 10,000, then starts counting down dramatically. Currently I have a few other modes I can trigger over the serial connection, to display other numbers / letters, to count up or count down, and trigger a beep using a Piezo buzzer I added. It can do other things, why shouldn't it?!?

Arduino source, plus my tweaked version of the LedControl library, available on Bitbucket: https://bitbucket.org/jamesneko/death-clock