In this particular mini project, Im learning the use of a dedicated micro-controller which is labelled 74HC595, for this chip has 8 bit register and memory, it does something quite useful when you have too many things to control at once while only having one board.
In this case im controlling 8 LEDs at the same time, if i would do it the other way, my Arduino board wold be full of wires and hard to use, this is when the extra microchip comes handy, I am able to use only 4 pins to control 8 LEDs with the help of 74HC595, although this isnt something I would use for my final outcome but its always great to learn new skills, it would be useful some day.
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