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Check out this great looking Binary Burst Clock that Mike Szczys from Jumptuck has built. At first glance you might be a bit confused on how to read the clock but it is actually quite simple. Mike ordered the boards from Seeed Studios and had a good experience and it was cheap! In this design a MCP7940 RTC chip is keeping track of time with the help of a coin cell mounted on the back of the board. An ATtiny84 is controlling the board, it is mounted on the back of the board also so in these pictures it isn’t visible (see the full project page to see pictures of the back) .
Via: Dangerous Prototypes