LCD Displays: 1602 and 2004. 2004 Support?

Posted by: @joelyddon

Example instructions for the 2004?

I don't know anything about it, but after reading your post I Googled LCD 2004 Arduino and came up with a bunch of stuff, including the following 3 YouTube videos just on the first page.

I haven't watched these.  Neither do I have a clue exactly what you are looking for.   This was so easy to find surely it must not be what you are looking for?

@joelyddon

They are the same

@robo-pi

YES!

This is exactly what I was looking for!

I missed the Forest for the Trees...  forgetting about Google... !  🙁  duh...

Thank you very much...  This helps a lot!

Posted by: @triform

@joelyddon

They are the same

 

Are you saying that I could just Use & Code for the 2004 from the 1602 examples?

Just refer to 2004 positions and have it work just fine?!

If so, I wish someone would have said so!!

That would be too good to be true...  usually, there is a GOTCHA...  right?  🙂  😀

Thank you...  I hope you are right...  We shall see, in a few days, Thanks to the China Holiday Week...

@joelyddon

One is 16x2 and the other 20x4, but the same pins and registers.

@triform

OK, are you saying I can just pretend it's 20x04 and expect it to work?!

Just use it AS IF it was 2004 and be done with it?

I hope you are right...  I will let you know when I get it and TRY it...   🙂

Thank you...  I really hope you're right!

@joelyddon

You'll have to initialize the LCD2004 in setup() with :

 lcd.begin(20,4);

And before setup() in your sketch, depending on the I2C module you have, you may have to adjust the following (my I2C module, pre-installed at the back of the LCD2004, is a PCF8574T in SO16 form factor) :

// Define LCD pinout
const int en = 2, rw = 1, rs = 0, d4 = 4, d5 = 5, d6 = 6, d7 = 7, bl = 3;

// Define LCD I2C Address - change if required
const int i2c_addr = 0x27;

LiquidCrystal_I2C lcd(i2c_addr, en, rw, rs, d4, d5, d6, d7, bl, POSITIVE);

Here is an example I edited for my LCD2004 from Bill's demo :

Hi..I just tried the Generic module with know luck. 1602 works and 2004 does not? I looked at the limited info from ebay and it says the the units are universal. However the module looks very similar to the sain smart unit. I then looked back on the Sain smart website and this unit is universal. Does any one have any ideas? Maybe I have a defective unit?

@olinovid Could you give  bit more info on what you tried ? Is it an LCD with an I2C module ?

If so, remember to first check the I2C address with the I2CScanner sketch from Bill's article and video https://dronebotworkshop.com/lcd-displays-arduino/

@zeferby

Eric,

Thank you very VERY much!

That is what I was looking for...  I knew something special HAD to happen to go from 1602 to 2004...  🙂

@olinovid

Check out ZeFerby post just ahead of yours...  🙂

Welcome aboard!

@zeferby

I2C...  I think...