Add more pins to your Arduino/ESP8266 board using PCF8574T module

Imagine you build a project and then you just run out the pins. You need more pins for your project to drive something.
In this video, we will learn to add more pins to our Arduino board using this module. I will demonstrate it with Arduino UNO and an EPS8266 board WEMOS. We also test the output by blinking LEDs and a relay then test the input of this expander module by reading input from a button and an infrared sensor. And we also try to use more than one module to a single Arduino board so we got 16 additional pins.
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[@Wolf1898]

thank you for the video, it really helped me out!

[@GEOFFREY-YT]

Good morning,
Many thanks for your video. Everything works fine for me but I have a question, how to change the PCF8574 inputs. I would like to configure my Atmega328 but cannot do it without modifying the PIN outputs (pin A5 and A4)...
Thank you and have a nice day :)

[@Stephens8x6Workshop]

Very Helpful, thank you

[@erahmadkamram]

how to write or read individual ports or pins of 8574 module using wire library only? do not use pcf8574 library.

[@ironman5034]

Using this module, can the servo library work with a servo connected to the module directly or i need to write my own pwm code that talks to the the module?

[@HakkiOgrt]

Thank you

[@flornkm]

Hello sir, is it possible to connect a stepper to the P0 and P1 pin with a driver to control it? Thank you good video

[@user-dw1qf7cc4n]

my esp8266 dosent have 5V pin. what can i do

[@vinayhs3237]

Connect to (VIN) PIN of esp8266

[@devilshome9987]

can two lora nodes communicate with each other if there address is same !?

[@miliohm]

What address?

[@limjunyi2211]

Hello sir, I've found a problem when I connect the pcf8574 extender module(blue color one) to my nodeMCU. The LED connected to the pcf8574 extender module can only generate a faint light. Does it mean my pcf8574 extender module is broken or something goes wrong? What is the solution? Hopefully, I can receive a reply. TQVM

[@miliohm]

What did you try to drive?

[@limjunyi2211]

@@miliohm I try to ON my led on the pcf8574 extender module

[@limjunyi2211]

@@miliohm I follow all the step in the video, however, my led can only light up gloomy.

[@miliohm]

@@limjunyi2211 that's normal since this module is designed as sinking. So you should put pcf -> resistor -> Vcc. And the LED will light up when you put LOW output.

[@limjunyi2211]

@@miliohm Sry sir, i don't get it. Could u please explain more?

[@peymanahmadi8398]

علیز بنگی 🤣