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Digital dashboard with TM1638 and Arduino Nano v3

This is a project that was trying to finish for years now, but was always stuck
on the complexity of the 7segment circuitry for a project like a car digital dashboard.

f1_dashboard.jpg

About a month ago I discovered those neat 7segment displays based on the TM1638 chip
that are incredibly cheap and its layout is very close to the one I wanted. You can see them
here: http://www.dealextreme.com/p/8x-digital-tube-8x-key-8x-double-color-led-module-81873

To drive the ...