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