Practical Guide to PCF8574: Adding Extra Pins for Arduino

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Discover an easy way to add more GPIO pins to your Arduino with the PCF8574 in this tutorial. We'll explore how it can be a handy alternative to other methods like shift registers, Max7219, and multiplexing. The video shows you how to control a single LED and a 7-segment display using the PCF8574, making it suitable for various projects. Plus, learn how to use expander pins for input and make the most of the interrupt pin. This tutorial is perfect for both beginners and those with some experience. Hope you find it helpful!
The link to the code can be found here:
www.hackster.io/mdraber/pract...

[@rogerbarton1790]

I was wanting to expand my Arduino IO ports and considered using a shift register and 2 GPIO pins for clock & data, and then I thought of providing an interrupt if a switch was pressed.
I couldn't believe my luck when I stumbled across this device.
Excellent video BTW

[@Marcello970]

Grazie per il video Mario, un altro modulo che puù essere molto utile e, soprattutto, spiegato molto bene 👍

[@mehmetaltinsoy525]

Thanks

[@Omegajet223]

Hi Mario, as always another interesting tutorial...you have gained another sub 👍
I really wanted to try this out, however you didn't include any links to your code.
Look forwards to the next tutorial.

[@marios_ideas]

www.hackster.io/mdraber/practical-guide-to-pcf8574-adding-extra-pins-for-arduino-4095f2

[@jumbo999614]

Please do NRF24L01 wireless module with bi-directional communication for upcoming video.

[@giovannimanilardi480]

Hi Mario, I have this PCF8574 module but I can't interface it with my 16x2 LCD display. Do you have any working connection diagram to connect pins P0-P7 with display pins and related example code? Thank you.

[@marios_ideas]

I didn't use expander for LCD display but I am sure this should work. I am not going to create such video as you are the only person asking this sort of question and that would be fair amount of work. What I can advice is to go to chatGPT and ask the question e.g."Can LCD 16x2 display be connected to Arduino so diplay data pins use pins of the expander PCF8574 " this should return listing of connections as well as code examples.

[@giovannimanilardi480]

@@marios_ideas thanks very kind

[@daisywong-ke1kz]

GREAT work! We'd like to offer you some boards if you need them in the upcoming content. (PCBWay Daisy) :D

[@marios_ideas]

Let me know what products do you have. I am already talking to PCBWay in terms of using the custom PCB. I will be releasing the first video in a matter of days where I would be giving the shoutout To PCBway for providing me with the printed circuit board. It was supposed to be ready in Jan, but I was busy at worked and had to slow down.