Expand your Arduino with shift registers! Today I will show you how to use the 74HC595 and 74HC165 to increase your Arduino’s inputs and outputs so we can flash a bunch of LEDs.

Shift registers are sequential logic circuits that can be used to convert between serial and parallel data. Really exciting stuff, right?

Well although these fundamental building blocks may not seem that thrilling, they can be really useful in expanding the number of digital outputs and inputs on Arduino and other microcontrollers.

Today we will work with two common 8-bit shift registers, the 74HC595 and 74HC165.

We will use the 74HC595 to drive eight LEDs with just a few connections. By cascading these chips we can drive a lot more LEDs. We will also use the 74HC595 to drive a 7-segment LED display.

After that we will hook up eight push buttons to a 74HC165, reading them all using just a few I/O lines on our Arduino.

And finally, we’ll put both chips together and build a really fun LED light sequencer with eight different flashing patterns.

Here is a breakdown of this extensive coverage of shift registers with the Arduino:

00:00 - Introduction
03:03- How Shift Registers Work
07:32 - More outputs with the 74HC595
15:22 - Driving a 7-Segment Display
21:49- Extra inputs with the 74HC165
29:46 - 74HC595 & 74HC165 Together
34:30 - Custom Light Sequencer

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