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Undestanding the pin assignment LCD i2C

onemikeoscar

Hi everyone!

First i need to admit something hahaha, i'm spanish and in first place sorry for my rought english.

 

I'm here for Ben Show, it's a incredible show and i love it hahaha but i think that i doesn't matter now xD

I bought one i2c adapter for LCD in ebay (you can see it here) the problems came when i tried to start typing something.

I have had a lot of problems with the LyquidCristalI2C library, all of this problems are for the pin assignment, the last combination

that works was this: LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

My question now is How can i find the values of these parameters? I mean, i only try with the standard values but i think that it will have one way

to discover this values (maybe one datasheet or something else, i dont know).

 

I hope that you cand understand my question and again sorry for my english.

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  • Jose, if I understand you correctly you want to know the connections between the Arduino and the LCD serial module.  There are several versions of the serial modules and they all use different pin configurations.  The best source of information and how to identify the modules that I have found is on "yourduino.com"  There is also some Arduino code for each module type.  I have used the serial or I2C modules with great sucess using the information on the site noted above.

     

    If you need more help please ask.

     

    Bob

  • in reply to bobcroft

    I have the same question. Is there a complete list of codes for the display?  Some are used in the sketches such as blank the display, blink the cursor etc.

    Thanks Bill

  • in reply to billpenner

    Bill,

            if you look on www.yourduino.com at these modules and the associated Wiki there is a full list of all the functions and some very good explanations.  With reference to Peter's comments the variants available on EBAY do, I believe, differ in the way the PCF8574 pins are connected to the LCD display.  I have two versions at least and I can get both versions to work perfectly by changing the pin list in LiquidCrystal_I2C.  There may also be modules that use a different I2C to parallel converter chip.

  • in reply to bobcroft

    Yes I know that the only thing that you need to do in order to work with differents modules (with differents pinouts) is change the constructor but my question and I think that it's the same for other people is what is the way to discover the pinout of the differents modules (all modules with the same controller).

    For example, you told that you have two version, okay, what way you followed to discover what values to put in the constructor? (the only way is yourduino.com)

     

    Thanks bob.

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  • in reply to bobcroft

    Yes I know that the only thing that you need to do in order to work with differents modules (with differents pinouts) is change the constructor but my question and I think that it's the same for other people is what is the way to discover the pinout of the differents modules (all modules with the same controller).

    For example, you told that you have two version, okay, what way you followed to discover what values to put in the constructor? (the only way is yourduino.com)

     

    Thanks bob.

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