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This digital clock driven by Arduino is a fun emulator of 4-stroke engine where the digits of hours & minutes represent the pistons moving.

The “4-Stroke Digital Clock” driven by Arduino is a fun emulator of an internal combustion engine in a digital clock. Hours and minutes digits represent the pistons moving and with a precise RPM control (100 to 800). The RPM are shown by two columns in the center of display.

Another interesting visual information is the firing sequence “1-3-4-2” of cylinders. Spark starts when the piston is at the top of cylinder in the compression cycle. The code is a good exercise for managing dot matrix pixels and for introducing a simple animation feature.”

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