Chapter 17 74HC595 & LEDBar Graph
We have used LEDBar Graph to make a flowing water light, in which 10 GPIO ports of RPi is occupied. More
GPIO ports mean that more peripherals can be connected to RPi, so GPIO resource is very precious. Can we
make flowing water light with less GPIO? In this chapter, we will learn a component, 74HC595, which can
achieve the target.
Project 17.1 Flowing Water Light
Now let‘s learn how to use 74HC595 to make a flowing water light with less GPIO.
Component List
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