PCF8574 GPIO Extender - With Arduino and NodeMCU

In this tutorial, I am going to talk about the PCF8574 8-bit GPIO Port Extender. It is one of the many GPIO extenders available in the market.

This tiny little board becomes a life saver, When you run out of pins on your Arduino. This "GPIO (General Purpose Input Output) pin extender" provides an additional 8 pins (P0 ~ P7) which can be used to 'output a signal' or 'read a signal as an input'.
These modules run on the I2C bus, and if daisy-chined you can connect upto 8 of these devices in a project. Each device will give us an additional 8-bits of GPIO enabling 64 GPIOs in total.

Topics Covered
--------------
Overview of the I2C Technology ........................................ 01:57
Closer look at the PCF8574 GPIO Extender IC and the Breakout Board .... 02:57
GPIO Addressing ....................................................... 05:25
Libraries To Use ...................................................... 05:48
Connecting PCF8574 to Arduino and NodeMCU ............................. 06:32
Finding address using I2C Scanner ..................................... 07:24
How to program and use PCF8574 in your project ........................ 07:56
How to use the Interrupt Pin .......................................... 09:15
Areas of Application .................................................. 10:15

Download Links
--------------
Library : https://github.com/xreef/PCF8574_library
Codes : https://cdn.instructables.com/ORIG/FS... , https://cdn.instructables.com/ORIG/FM...
I2C Scanner : https://cdn.instructables.com/ORIG/FA...
DataSheets : https://cdn.instructables.com/ORIG/FL...
Schematic : https://cdn.instructables.com/ORIG/FZ...
Instructable: https://www.instructables.com/id/PCF8...

#PCF8574 #GPIOExtender