User manual

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Chapter14 74HC595

What’s 74HC595?

74HC595 with 8-bit register and a memory, and has three-state output function. we use it to

control 8 LED lights. Why do we choose 74HC595? If we control eight small lights just with

Arduino, how many its I / O will be occupied? The answer is eight. However one arduino uno only

have 20 I/O port. 8 small lights have take up too many resources. The purpose we use 74HC595 is

to reduce the occupation of the number of I / O port. With 74HC595 chip, we can use the 3

digital I / O port to control 8 LED lights. Why not?

Prepare experimental components below.

Connect the circuit diagram according the schematic diagram.