This was very useful, thank you. As an older learner, I needed a slightly slower pace but it's easy to pause the video or play it at 75% speed, which I found excellent so as not to miss anything.
I just come to thank you for all the help you gave me to solve the issue of controlling 8 SSD relays with a single pin extender in NodeMCU. Thank you very much for the time you gave me.
Thank you for that informative video. You took it at a fair pace but I found it exactly right. You covered a lot of ground in 11 minutes but I understood all of it - it was very clearly presented.
Hello, Very instructive post, one thing you want to be careful about about the PCF8574 modules, they already have a 1 kOhm pullup on the board (the 2 small resistors next to the male connector). If you want to daisy chain several modules, you need to remove these resistors on all but one of the board, otherwise the pullup becomes to strong ... if you daisy chain 8 modules, the pullup value is 1kOhm/8 : 125 ohm which is a bit strong : 5V/125 ohm = 40 mA...
MULTIPLEXER DISPLAY 7 SEGMENTS (COMMON ANODE OR COMMON CATODE) - ARDUINO - PCF8574 REMOTE 8 BIT I/O EXPANDER FOR I2C BUS ua-cam.com/video/ENlRaSL34h0/v-deo.html
very good tutorial! before the video i didn't know what chip i have, now i not only know how to use it but also got lots of ideas where i could use it :)
Its really great presentation. I used it, interface 4x4 keypad. I had a little issue...which automatically gone without any efforts. Issue 1. LCD start flickering, then somehow it got stable, when I removed SDA and SCL wires. Issue 2. For testing purpose , I am doing ON/OFF of one LED, which Stoped when I connected/Disconnected SDA/SCL. After Switching OFF/ON the power , LCD and LED both working fine. What you suggest ? do SDA/SCL connection impact on other things ? Any Capacitor or something required ? Value of PULLUP resistor ? (this exercise was done with RAW atmega16A chip).
i have no electronics skills. This Tutorial was easy to understand. What are the two pull up resistors good for? A0, A1 and A2 how do you set their address? Are you just giving them 3,3 volts?
Nice tutorial! Some time ago I made a library to drive the Nokia LCD using a PCF8575 or PCF8574 I/O expander. I recognize the effort you have taken to deliver such high quality video. May I ask which software you use to make the animated graphics?
Hi there First of all thanks for the appreciation These ics are real life savers. I have used Vsdc free and Flimora For the animation. Have a blessed new year.
What would you propose for driving 3/5v relay modules ? I need 4x8 gpio output ping that are capable of providing 5mA each, so for one relay module (x8) I would need some expander to provide me 8x5mA=40mA. I had this module and it provides only 0,8mA (?) and also mcp23008 and the same amount, so they are not enough for me.
Hello! thank you so much for the tutorial, can i ask how do you control rhe PCF8574 port output individually? Currently i am using the wire.h library to manually write them, and i am controlling the output by writing the hexadecimal in to the pcf8574. however there will be an overwrite of my previous input. For example to control the port output to be high or low case 15: write 0x01 case 16: write 0x02 case 17: write 0x04 case 18: write 0x08 input 15 -> P0 will be high -> input 16 -> P0 will be Low and P1 will be high Will want this to be changed to P0 AND P1 to be high which means the previous input wont be affected
i have some problem, i use pcf8574 and arduino. when arduino get power on, all pcf8574 pin active high. how to set pcf pin always Low/off when power on.
Hey there, thanks for a great video, very instructive. I have a question if you can help me please. When I attach a LED light to my 5v and ground from my arduino it works great. When I attach this led to a pin on my expander board it is very dull. I am not sure what is happening - thanx
I have (at long last) worked out where I am going wrong. I was attaching the LED the wrong way. The correct way is +ive to the 5v rail and -ive to the I2C pin. HAPPY HAPPY HAPPY :¬)
I bought it from this seller: www.aliexpress.com/item/5PCS-PCF8574P-DIP16-PCF8574-DIP-new-and-original-IC-In-Stock/32874028961.html?spm=a2g0s.9042311.0.0.27424c4dDlq15X Thanks for watching, plz do subscribe for more tutorials/projects coming soon. Also if you have time check out my other tutorials :)
Hi, can i connect a PCF8574 and after in serie a PCA8685 on the same I2C bus ? with the new PCF8574 GPIO, can i control a DFplayer Mp3 Mini, o receive data from a IR Receiver ?
How did you get one of the PCF8574P's mate. To my knowledge they are discontinued Anyways the datasheet still has a bit of info : www.nxp.com/docs/en/data-sheet/PCF8574_PCF8574A.pdf
So when you use an input button, should you be using a pulldown resistor for each input so it doesn't float? Or is that taken care of by the chip or breakout module?
Hi very nice and explaining video. I built the first modules and they are individually all working. I run into a trouble when I wanted to copy all bits from the first PCF8574 into the second one. ( one is the collecting device, the second one is the address devise.). Individually they worked fine but the command - digitalReadAll(); - gave me something what I do not understood. I have for eg. Two PCF8574W(0x20); // device to write PCF8574R(0x21); // device to read I want to transfare the whole byte from PCF8574R.digitalInputAll(); into the PCF8574W device. ( in the future I plan to change the devices for the 16 bit version (PCF8575)). Will your code support also those devices? Thank you! Eugen/Austria
Hi, it's posible use this for controlling 8 reley (control individualy) in a wemos D1? I need add 5 other's sensors and oled display 0.96 I2C, but wemos d1 only have 11 gpio pins. Can you help me with this problem, please?
HI There Yes you can control 8 relays individually using any MCU I havent worked with a Wemos D1 yet so cant comment a lot on that However, if you want to use I2C OLEDs you can use an I2C MUX for that: Check out:ua-cam.com/video/XWQsqPQOW-U/v-deo.html A full tutorial on OLED displays is here : ua-cam.com/video/_e_0HJY0uIo/v-deo.html
With 64 servos, motors and sensors you could make very advanced robotics based on a single board computer or indeed a Arduino chip. Make a 3D printed cat please :)
you got a new subscriber and a thumbs up, although i found the presentation a little shall we say breathless. I myself prefer a slightly more moderate pace. but all in all great info just when i needed it. could you possibly make a video on how to use the interrupt on this device to wake a wemos d1 mini or similar device
Sure can And thanks s lot. I tried adding pretty much everything in one video so tried to keep the pace otherwise it would have sounded boring and monotonous. Like my tutorial no 1. If you have time checkout my tutorial no 7 on OLED displays. That’s one of my blockbusters.
i'm having problems this ywo errors help me pls error: 'class PCF8574' has no member named 'pinMode' error: 'class PCF8574' has no member named 'digitalRead'
you need to set the HEX address first: PCF8574 ex1(0x20); PCF8574 ex2(0x20); and so on to use them u just call them by their name ex1.digitalWrite(P0, HIGH); and so on Check out the video from here: 08:15
Why not just use the PCF8575 if maximum IO is the goal? Of course it'd require a bit of tweaking to the 8574 library, but not much, and would double the IO for a very very small price increase! The TCA9534 is also quite interesting for inputs as it has essentially the same functionality and pinout as the 8574, 8474A, 8575, etc., but with the addition of internal pullups on P0-P7 as well as the interrupt pin.
@@CrazyCoupleDIY Sure, yet nothing in my comment could even possibly be misconstrued to be me claiming you said this was the only IO expander available. It was just a very simple suggestion for an alternate IC more suited to your goal of maximum IO expansion, so I'm not really sure what that's even supposed to mean.
@@martinj9647 Well I can suggest an even better one. This one is slow just 100KHz. I would suggest MCP23017 instead as it is 16 bits and can be programmed to be both input or output and speed up to 1.7MHz. It also available for SPI version which means more speed.
@@CrazyCoupleDIY I feel like you're clearly the type of person who thinks simple suggestions are like some sort of personal attack or challenge of your intellect, sooo hard pass. Good luck with your eye two see adventures!
@@martinj9647 Well, I guess you are that type of person who has nothing else to do in this world other than whining on people. Well, good luck with whatever knowledge you have. Just remember one thing mate, if you have a house made of glass dont throw stones on other people
@@CrazyCoupleDIYCool that's what I was figuring. Do you have a complimentary suggestion for pin expansion that supports PWM. From what I understand I would need a built-in PWM driver like www.adafruit.com/product/1411 However I'm using a 5$ NodeMCU and it feels wrong it have to employ a 18$ shield ;)
pcf8574 isnt fully bidirectional, so calling it ' IO ' is a bit of a stretch of the truth, unless you can live with its limitations. The MCP23017 is the way to got if you want real bidirectional ' IO '
@@CrazyCoupleDIY I'm not so sure, I searched the internet and only found 1 product in DHI Electronic. I am very happy if you want to make a video about this, thank you very much.
This was very useful, thank you. As an older learner, I needed a slightly slower pace but it's easy to pause the video or play it at 75% speed, which I found excellent so as not to miss anything.
Thanks for the appreciation
I will try to slow down a bit in my upcoming videos.
@@CrazyCoupleDIY You are enthusiastic... that's what matters. Please keep publishing your videos.
Cheers thanks 😊👍
@@CrazyCoupleDIY why pull-up resistor is used ?
Totally agree with you CC. Glad to see I wasn't the only one. A lot of info at the speed of light.
I just come to thank you for all the help you gave me to solve the issue of controlling 8 SSD relays with a single pin extender in NodeMCU.
Thank you very much for the time you gave me.
All good mate. Sorry for a bit of delay in replying as I was on a road trip yesterday.
Do let me know if you need more help.
Always happy to help ✌️👍
Thank you for that informative video. You took it at a fair pace but I found it exactly right. You covered a lot of ground in 11 minutes but I understood all of it - it was very clearly presented.
Glad you enjoyed it!
You are very welcome
Thank you for sharing this video. Very clear, easy to understand, and straight to the point.
Thanks 👍
I thank you immensely, imrão you are to be congratulated for the blessed work, forward only upwards and only forwards,
Much appreciated
Very helpful in understanding the io expander module.
Thanks
Thanks
Hello,
Very instructive post, one thing you want to be careful about about the PCF8574 modules, they already have a 1 kOhm pullup on the board (the 2 small resistors next to the male connector). If you want to daisy chain several modules, you need to remove these resistors on all but one of the board, otherwise the pullup becomes to strong ... if you daisy chain 8 modules, the pullup value is 1kOhm/8 : 125 ohm which is a bit strong : 5V/125 ohm = 40 mA...
Thanks
Very nice, I loved the pace with with the information was delivered
MULTIPLEXER DISPLAY 7 SEGMENTS (COMMON ANODE OR COMMON CATODE) - ARDUINO - PCF8574 REMOTE 8 BIT I/O EXPANDER FOR I2C BUS
ua-cam.com/video/ENlRaSL34h0/v-deo.html
Fantastic Video. I am amazed how much I have learned in 10min. Thank you
Pleasure 🙏
Great quality video. Best tutorial ever about this subject. Thank you very much!
You are most welcome
Check out my other tutorials and projects in your spare time ✌️✌️✌️
very good tutorial! before the video i didn't know what chip i have, now i not only know how to use it but also got lots of ideas where i could use it :)
I am glad that I was able to help you
Excellent tutorial, thank you for creating and sharing it!
Thanks for the appreciation
Its really great presentation. I used it, interface 4x4 keypad. I had a little issue...which automatically gone without any efforts.
Issue 1. LCD start flickering, then somehow it got stable, when I removed SDA and SCL wires.
Issue 2. For testing purpose , I am doing ON/OFF of one LED, which Stoped when I connected/Disconnected SDA/SCL.
After Switching OFF/ON the power , LCD and LED both working fine.
What you suggest ? do SDA/SCL connection impact on other things ?
Any Capacitor or something required ? Value of PULLUP resistor ?
(this exercise was done with RAW atmega16A chip).
Excellent tutorial. Thank you very much!
You are welcome
i have no electronics skills.
This Tutorial was easy to understand.
What are the two pull up resistors good for?
A0, A1 and A2 how do you set their address? Are you just giving them 3,3 volts?
Well done
I will book mark 07:10 that's an important information for starters
Excelente vídeo, parabéns e obrigado !!
Thanks mate
dear really mind-blowing explanation. superb.
Thanks mate
Nice tutorial! Some time ago I made a library to drive the Nokia LCD using a PCF8575 or PCF8574 I/O expander.
I recognize the effort you have taken to deliver such high quality video. May I ask which software you use to make the animated graphics?
Hi there
First of all thanks for the appreciation
These ics are real life savers.
I have used
Vsdc free and
Flimora
For the animation.
Have a blessed new year.
@@CrazyCoupleDIY - Thanks for the info. I wish you too much happiness, good luck and health in the new year. Have fun!
This was very helpful, thank you.
Cheers thanks
again watching ..interesting
What would you propose for driving 3/5v relay modules ? I need 4x8 gpio output ping that are capable of providing 5mA each, so for one relay module (x8) I would need some expander to provide me 8x5mA=40mA. I had this module and it provides only 0,8mA (?) and also mcp23008 and the same amount, so they are not enough for me.
best tutorial! straight to the point with useful information! please keep it up
Thanks for the appreciation
Very nice tutoral
:)
Great video! Helped a lot. Thanks 😍😍
Hello! thank you so much for the tutorial, can i ask how do you control rhe PCF8574 port output individually?
Currently i am using the wire.h library to manually write them, and i am controlling the output by writing the hexadecimal in to the pcf8574. however there will be an overwrite of my previous input.
For example to control the port output to be high or low
case 15: write 0x01
case 16: write 0x02
case 17: write 0x04
case 18: write 0x08
input 15 -> P0 will be high -> input 16 -> P0 will be Low and P1 will be high
Will want this to be changed to P0 AND P1 to be high which means the previous input wont be affected
Really well explaned ... I'd be interested in your boards you mentioned at the end.. did you ever create them ?
Hey
First of all thanks for watching
Secondly, na I have not created one yet 😉
Great job, very clear and informative
Thanks for checking out
Great
excellent tutorial
Glad you liked it
i have some problem, i use pcf8574 and arduino. when arduino get power on, all pcf8574 pin active high. how to set pcf pin always Low/off when power on.
Hey , Very crisp and clear explanation. Thank you.. BTW. I am looking for 16 bit expansion. Can I use MCP23017 which has 16 io pins?
First of all thanks
And secondly you may use MCP23017
Or piggyback couple of these
Great video thank you! But there is a mistake in one of your tables: A0 and A2 are inversed at 5:27
Oops
But i am using multiple PCF and the address is conflicting is there any way to define the address or connect both without using a multiplexer.
does this chip debounce button press automatically?
Hey there, thanks for a great video, very instructive. I have a question if you can help me please. When I attach a LED light to my 5v and ground from my arduino it works great. When I attach this led to a pin on my expander board it is very dull. I am not sure what is happening - thanx
I have (at long last) worked out where I am going wrong. I was attaching the LED the wrong way. The correct way is +ive to the 5v rail and -ive to the I2C pin. HAPPY HAPPY HAPPY :¬)
I am glad you fixed it
Good work.
very clearly, thanks sir
Most welcome
Very nice video, good job! Thank you!
Thanks mate
Khub valo....
Thanks a lot :)
Very useful, thanks!
Very use full... where u bought the ics.. not the breakout board.. i want dip type to keep in pcb... can you send me the link.. thanks in advance
I bought it from this seller: www.aliexpress.com/item/5PCS-PCF8574P-DIP16-PCF8574-DIP-new-and-original-IC-In-Stock/32874028961.html?spm=a2g0s.9042311.0.0.27424c4dDlq15X
Thanks for watching, plz do subscribe for more tutorials/projects coming soon.
Also if you have time check out my other tutorials :)
Very nice tutorial
Thanks
Why do you need external pull-up resistors on the esp8266? Why can't you use the built-in ones?
Is it similiar with I2C backpack LCD ?
Nice Clear Information.Thanks.
Thanks 😊
Thank you so much to solve my problem
You are welcome and
Happy new year 🥳
@@CrazyCoupleDIY same to you
I have another problem can how can i control 2 i2c module using PCF8574 library
Hi, can i connect a PCF8574 and after in serie a PCA8685 on the same I2C bus ? with the new PCF8574 GPIO, can i control a DFplayer Mp3 Mini, o receive data from a IR Receiver ?
I have not tried that
So can't give you a straightforward answer. Sorry mate
Nice information 🙂
Love it 😍
Thanks 👍
I would like to control the GPIO of a chip from the operating system using a program written in C ++. Which IC should I use?
Why can’t you use Arduino ide
Super cool
4:24 and what for p instead of a from of 8574 A/P ?
How did you get one of the PCF8574P's mate. To my knowledge they are discontinued
Anyways the datasheet still has a bit of info : www.nxp.com/docs/en/data-sheet/PCF8574_PCF8574A.pdf
@@CrazyCoupleDIY AliExpress
So when you use an input button, should you be using a pulldown resistor for each input so it doesn't float? Or is that taken care of by the chip or breakout module?
It is taken care by the chip.
@@CrazyCoupleDIYCool, thx!
Hi very nice and explaining video. I built the first modules and they are individually all working. I run into a trouble when I wanted to copy all bits from the first PCF8574 into the second one. ( one is the collecting device, the second one is the address devise.).
Individually they worked fine but the command - digitalReadAll(); - gave me something what I do not understood.
I have for eg. Two
PCF8574W(0x20); // device to write
PCF8574R(0x21); // device to read
I want to transfare the whole byte from PCF8574R.digitalInputAll(); into the PCF8574W device. ( in the future I plan to change the devices for the 16 bit version (PCF8575)). Will your code support also those devices?
Thank you!
Eugen/Austria
Wow it's very interesting tutorial
This is amazing!!
I am glad that you liked it
Hi excuse me I have a problem with digitalPinToInterrupt, it's not declared please can u help me?
Good one .Thank you
Excelent video... thanks
You are mot welcome
Do I need the breakout board at all, or is just using the IC with the 10k resistors ok? If I only use the IC, can I run the IC scanner?
Just yeh if with the pull-up traitors is fine.
Yes u can run the scanner
Great, thanks!
Very interesting!
Hi, it's posible use this for controlling 8 reley (control individualy) in a wemos D1? I need add 5 other's sensors and oled display 0.96 I2C, but wemos d1 only have 11 gpio pins. Can you help me with this problem, please?
HI There
Yes you can control 8 relays individually using any MCU
I havent worked with a Wemos D1 yet so cant comment a lot on that
However, if you want to use I2C OLEDs you can use an I2C MUX for that: Check out:ua-cam.com/video/XWQsqPQOW-U/v-deo.html
A full tutorial on OLED displays is here : ua-cam.com/video/_e_0HJY0uIo/v-deo.html
Crazy Couple but how pin 8 relay and 2 sensors in mcu? All pins It’s possible for use digital?
I will make a sketch and will show you tomorrow morning
Crazy Couple thx!!!!
@@ManuelCastillo-kq3xy Please check this out imgur.com/a/KVYcrge
If you still have any questions please send me an email
am asking for help the expander gives high state 5v but when I connect the diode, the voltage drops on 2v what to do?
With 64 servos, motors and sensors you could make very advanced robotics based on a single board computer or indeed a Arduino chip. Make a 3D printed cat please :)
Sure, I will definitely try that.
Thanks for the suggestion
AWESOME!!!
Cheers 🥂
Thanks
Welcome
I cannot san
Just showing below message.
I2CScanner ready!
starting scanning of I2C bus from 8 to 200...
The only one problem, for me, is all examples are realized with and arduina nano. In the nodeMCU, its different conect to pines and everything....
I did explain in this tutorial how to connect this to a NodeMCU board.
Don’t worry I will reply to your email with full details.
@@CrazyCoupleDIY thx man!!!!!
@@ManuelCastillo-kq3xy did you find the way how to do it in nodeMCU sir?
@@CrazyCoupleDIY did you find the way how to do it in nodeMCU sir?
@@ManuelCastillo-kq3xy is it possible or no sir?
you got a new subscriber and a thumbs up, although i found the presentation a little shall we say breathless. I myself prefer a slightly more moderate pace. but all in all great info just when i needed it.
could you possibly make a video on how to use the interrupt on this device to wake a wemos d1 mini or similar device
Sure can
And thanks s lot.
I tried adding pretty much everything in one video so tried to keep the pace otherwise it would have sounded boring and monotonous. Like my tutorial no 1.
If you have time checkout my tutorial no 7 on OLED displays. That’s one of my blockbusters.
hey my desi friend video is wonderfull
Thanks brother
i'm having problems
this ywo errors help me pls
error: 'class PCF8574' has no member named 'pinMode'
error: 'class PCF8574' has no member named 'digitalRead'
Looks like your library is missing files
Can you please redownload the library needed for the PCF8574 and give it a retry
Interesting
Thank you for this amazing quality content :D [+1]
Thanks mate
well done buddy
Thanks 👍
I didn't get ic or module in my place can i use
PCF8574 i2C LCD driver
To expand my gpio
That’s also the same thing
@@CrazyCoupleDIY how to use those for pwm out
How about using serial in and out
@@CrazyCoupleDIY i never tried don't know about it...🤔
how we can initialize two different hex addresses in a single program while cascading multiple 8574 ICs, plz tell me
you need to set the HEX address first:
PCF8574 ex1(0x20);
PCF8574 ex2(0x20);
and so on
to use them u just call them by their name
ex1.digitalWrite(P0, HIGH);
and so on
Check out the video from here: 08:15
@@CrazyCoupleDIY hey, ex1 and ex2 are like variable names?
can i change ex1 and ex2 if i want
Why not just use the PCF8575 if maximum IO is the goal? Of course it'd require a bit of tweaking to the 8574 library, but not much, and would double the IO for a very very small price increase! The TCA9534 is also quite interesting for inputs as it has essentially the same functionality and pinout as the 8574, 8474A, 8575, etc., but with the addition of internal pullups on P0-P7 as well as the interrupt pin.
Well at the beginning of the tutorial I did say that "This is one of the many IO expanders available in the market"
@@CrazyCoupleDIY Sure, yet nothing in my comment could even possibly be misconstrued to be me claiming you said this was the only IO expander available. It was just a very simple suggestion for an alternate IC more suited to your goal of maximum IO expansion, so I'm not really sure what that's even supposed to mean.
@@martinj9647 Well I can suggest an even better one.
This one is slow just 100KHz. I would suggest MCP23017 instead as it is 16 bits and can be programmed to be both input or output and speed up to 1.7MHz. It also available for SPI version which means more speed.
@@CrazyCoupleDIY I feel like you're clearly the type of person who thinks simple suggestions are like some sort of personal attack or challenge of your intellect, sooo hard pass. Good luck with your eye two see adventures!
@@martinj9647 Well, I guess you are that type of person who has nothing else to do in this world other than whining on people.
Well, good luck with whatever knowledge you have.
Just remember one thing mate, if you have a house made of glass dont throw stones on other people
Can I use this one for interfacing 8 sensors to atmega 16
Sure u may
Just hook this up to the pin 22 SCL and 23 SDA and that’s it.
Thanks
Sir I am using node-MCU cam board, I need to extend gpios so where i can connect it?
Hi, I am not sure what type of board it is but if the board has i2c pins out please connect to that
Refer to the boards datasheet
@@CrazyCoupleDIY ESP-32 CAM is the board
Do the extended pins support PWM?
They are digital pind
@@CrazyCoupleDIYCool that's what I was figuring. Do you have a complimentary suggestion for pin expansion that supports PWM. From what I understand I would need a built-in PWM driver like www.adafruit.com/product/1411 However I'm using a 5$ NodeMCU and it feels wrong it have to employ a 18$ shield ;)
In the past I achieved this using 2x Arduinos connected to each other using serial port
is this possible whit an arduino leopardo?
Yes it is.
This extender connects to the I2C bus. So as long as the micro-controller has i2c pins it will work flawlessly
What is the code for reading value
Find the code in here: diyfactory007.blogspot.com/2018/12/pcf8574-gpio-extender-with-arduino-and.html
The more gpio pins the slower the comms or overall processing speeds will be.
True, but you can add up clock pulses to the setup to speed up the comms
Pcf8574 is not reading the value
pcf8574 isnt fully bidirectional, so calling it ' IO ' is a bit of a stretch of the truth, unless you can live with its limitations. The MCP23017 is the way to got if you want real bidirectional ' IO '
CY8C9560A IO Expander tuttorial please..
Hi there,
Sure I can make one but can you please suggest me where can I buy a fully assembled board from?
@@CrazyCoupleDIY I'm not so sure, I searched the internet and only found 1 product in DHI Electronic. I am very happy if you want to make a video about this, thank you very much.
I will do a bit of search and see if I can find something.
you know what? I'll maka a Video about this chip in english and also in German!
Good job
Well thanks for letting me know that I wasn’t speaking English
Bei mir geht der input nicht The input is not function What can I do
What exactly is the issue?
Plz explain so that I can help, thanks
@@CrazyCoupleDIY I'm can control the output About the input not read
Functions…………………………………………… 08:52
Pcf8574 i/o expander
I2C
Prohaska Highway
Watch out with these, all outputs are set HIGH as power on.
√√√
Thanks 👍
this guy only copy and paste from the PCF 8574 Library. nothing original. Do some thing from yourself
Thanks
Your word means a lot to me