LCD via I2C in STM32 || CUBEIDE || PCF8574 

These demonstrations are just excellent. Thanks for your good work and Happy New Year.

Such an amazing tutorial. I followed it and it worked on the first attempt. Thank you!

I just tried the this and followed your instructions precisely. It worked flawlessly! You taught me something new as I am new to this. Thank you.

Very good, clear and complete explanation. Thanks a lot!

Great Video! Thanks a lot from Germany :D DANKESCHÖN!

From Cambodia... Thank you very much for good demonstration

Thanks! Nice explanation!

Thanks bro! It was very useful for me! Tienes un nuevo un suscriptor desde Ecuador, gracias (You have a new suscriptor from Ecuador, Thanks)!!

thank you for your perfect toturial.

The code that I downloaded from your link had 0x20 instead of 0x28 for the initialization of the screen. This then initializes only the top row of the screen and not both rows. So if anyone else is having the problem where just the first line of the screen is working, just change the 0x20 to 0x28 in the initialization of the display.

Great video

You are the great man

Perfeito sua aula , obrigado por compartilhar conhecimento

For a quick tip, always consider pull ups with I2C, sometimes you struggle hours long with an empty LCD, but it turns out that the problem is open drain STM32 pins with no pull ups... Besides some modules have the address 0x27 not 0x4E, by the way thanks for the video...

You are the best !!!

It's maximum simple, thank u :)

Lot of thanks!

Please SHOW where to get the Library Flies from. Surely it is very important to know this.

Thank you so much :)

Hi, thanks for the tutorial. I am using the Nucleo-F303RE and had to change the void lcd_init (void) delays on the LCD that I am using. Then everything works well. void lcd_init (void) { // 4 bit initialisation HAL_Delay(50); // wait for >40ms lcd_send_cmd (0x30); HAL_Delay(15); // wait for >4.1ms lcd_send_cmd (0x30); HAL_Delay(15); // wait for >100us lcd_send_cmd (0x30); HAL_Delay(15); lcd_send_cmd (0x20); // 4bit mode HAL_Delay(15);

Default bus addresses for popular i2c LCD modules (if A0 A1 A2 pads unsoldered): (0x27

thanks a lot sir.

can you provide the proteus file? or show me how proteus simulation works?

did someone set up this project on the proteus? I have some doubts in that part.

How to send custom characters like a pause icon or something?

I have one problem following this code. When I attempted to run it up to the lcd_clear() calls, the display still has a bunch of jibberish characters on it. The for loop does have a continuous character print (though not quite what I expected) so I believe that, in principle, this code does work to an extent. I found it strange since based on what understanding I could glean from the HD44780U LCD datasheet so far, the code is consistent with the datasheet.

Only lcd_send_string function is not working in my project. pls guide me

Thank you very much! You are helpful person.

Could you please tell me the name to search and get the correct file?

Supposing that you are supplying the hole LCD module (LCD + PFC) with 5v, do we need a level shifter to 3v3 for the I2c lines?

Hi i need function on/off BACKLIGHT

Can I get some help for STM32L4+? I am using the PCF8574 so I am using SLAVE ADDR 0x4E like you did. However the code is not showing anything on the screen. Is there anything else I have to change for my STM?

how to use these libraries without using HAL/cube ide

I tried a lot of times but files are not yet downloaded

nice

Hola, tengo un STM32F411E, hice el programa con el display lcd-i2c usé la librería esta y todo bien, pero al darle Debug, no me presenta nada en la pantalla. que puede ser?.. se que el video es de 3 años, pero me está sirviendo y soy otro nuevo seguidor

its works, but i am having problems with the brightness and it is not the potentiometer, where should i change it?

The connection is correct. I also checked the device address using for loop. Its 0x4E. But when I send some string it just displays blank screen. LCD glows but nothing is displayed. Do I need to adjust the contrast ? Or the problem is something else ?

Can we use with proteus ?

I really can't send any strings. It does send the ASCII values but the lcd_send_string doesn't work, it just doesn't show anything. Please help, I know its late but I hope you are still here :)

The Link is not working i want the I2C LCD library files

Hi, where can i download the libraries u include in the project? i2c-lcd.h?

Great turorial, but I need to set the I2C address to 0x7E whit the same pcf8574 configuratión A1, A2 and A3 to high. I read in another tutorial I need to shit left one bit. If I set the address to 0x4E the code not run. I not understand this happens. I use the blue pill board too.

Master i can't send command variable on lcd it is not appearing.When i using f103 i included stdio.h and i used sprintf but it is not appearing but also it is apperaring when i use f407 discovery please help me

I can't figure out in the interface how to upload the code to the board....

Why is my lcd not displaying text? can anyone help me?

How can I display ADC value or temperature on lcd when I use this library

Hi sir although i performed the LCD as you exactly had done , it is displaying Meaningless symbols such as "?,! etc.". How can i fix it ??

Please could you share the library for the LCD

I am working with STM32f4 Discovery card and I need lcd header and source library files for this card. Can you help me ?

I performed the lcd i2c exactly you have done and with slave address 0x4E and 0x7E still the lcd display showing me black rectangles and not displaying the string that I have written in code.

lcd_data_string is not working.whaat to do ?it gives error implicit function declaration

decent video , but you should have spent more time explaining the configuration of the I2C in cube and the code download link is broken ( even the webpage on your website concerning the lcd i2c)

I do appreciate all the work that goes into your tutorials, both the coding effort and the video editing. The one problem I ran into, which took more than a day to sort out, was the lcd_init function, which indicates using 0x30 and 0x20 as commands. According to the specs, and my experience, those commands should be 0x3 and 0x2. For a noob such as myself, simple typos can be quite the challenge. A second discovery, not directly related to your tutorial: When I wanted to port the code to a Nucleo-103R8, I was mis-led by the Arduino pinouts and notations on the motheboard for SCL and SDA. It again took more than a few hours to discover those pins ONLY WORK when coding with the Arduino IDE wire library. To work directly with the STM32 mcu, the outer set of pins must be used. The code for the display will not work with the Arduino headers. It seems that that aspect of the Arduino shield vs the mcu pinout is not well documented, or at least I couldn't easily find such documentation. Again, thank you for your efforts, they are much appreciated and I have learned a lot from your tutorials.

How can i know which handler is for my I2c? i'm using PCF8574 but the SLAVE ADDRESS is 0x27 or 0x3F.

HI, I still can't understand why the data_t needs to OR(|) with 0x08 in cmd function.

LCD screen is not dislaying the right text. it is just showing some symbols and slash lines. What kind of problem could it be? Thanks in advance.

I have a problem, light on lcd is on, but there is nothing written.. I have STM32L476 and I'm not sure about the slave address. Can you help me?

Sir, i am using UART/I2C adaptor (atmel) with 16x2 lcd, & I tried to detect its i2c port in arduino which shows 0x63, will it remain same in stm32?, In STM32 After debugging and running there are no errors, The lcd glows but do not display text. Board-f030r8

Hi every ones. My LCD 16x02 is working on arduino, my STM32 NUCLE U575ZI-Q is working on the default project, the I2C on the LCD has PCF8574T and all three A0 A1 A2 are opened, I tried all address combination but nothig to do, i see only the light on LCD related the 5 Vdc, no sentence and nothibg nothing. Please help me

I used HAL_I2C_Master_Transmit_IT replace for HAL_I2C_Master_Transmit and it doesn't work.can you tell me why?

I have STM32F407VG discovery board, I did all thıngs same, and I already change slave base adress to 0x27 . Am I need to change anything else? When I try debug and play, nothing running on the lcd

Hi! I am using HW-061. What is the address for that? I am not able to find datasheet

hey, when i try to use send data comand, lcd prints random symbol, why does it prints only ASCI ? shouldnt send data let me send variable value to lcd?

excuse me, how to connect PCF8574 to STM32F103C8 like SDA, SCL, INT in proteus. how is that?

How can I set the display contrast?

Can you build this in Proteus? Cause i cant run it, the lcd wont respon

Failed to start GDB server Failed to start GDB server Error in initializing ST-LINK device. Reason: (18) Could not verify ST device! Abort connection. Help me pro?

I had a doubt can anyone please help me..the PCF8574 & LCD module are supplied 5V via the STM32 controller right? And since STM32 runs on 3.3V the SCL &SDA lines would carry 3.3V as well so then isn't this harmful for the PCF8574 IC as its supply voltage is 5V but the clock and data lines bring 3.3V

Very helpful video but can you explain why you say to not use address 0x27, my LCD uses the PCF8574T and its I2C address is 0x27?

where do i find the i2c-lcd library files?

Your lcd_clear function is superfluous. The lcd controller already has a command (0x01) to clear. Thus you'd better use "lcd_send_cmd (0x01);" The comments in lcd_send_data regarding rs are wrong. (is: "rs=0", should be: "rs=1")

Download Link is broken. Kindly update the download link..

it’s work very fine, good job. Can you help me to print the value of the potentiometer linked on ADC please?

doesn’t write anything in the second line… (

can you tell me what adress should i use with i2c2 and not i2c1?

and where do i get the .c and .h, cmon, the folder you make us download is not the same folder you copy those files from

Why does my code only run at 8MHz frequency?

Link for libraries does not work, please help, i really need those libraries :(

can i use with stm32f0 ?

can I use this coding for stm32f446re?

The library in the video and the library in your website are different.And it doesn't work

Where to get i2c-lcd.x files?

How can i download those files?

The oly thing i see is white bricks in the first row.

hai

why dont you just use your own voice man, this is quite cringy

Is this build can run in stm32f4?