Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

[dandlion1]

Just got this 20x4 LCD board (JND2004A) with your GEEETECH LCD1602 Serial interface module. I can't get it to work with any of the sample ("Hello World") Arduino sketches I can find on line. All I get is 2 lines of block characters (all pixels on) - looks like the first and third line. The back-light will come on for a while - then blink - then go off.

Can you please provide spec sheet and a sample Arduino Sketch for this module.
Thank you very much.

[techsupport]

hi,dandlion, You can refer to the following link:
http://www.geeetech.com/wiki/index.php/ ... LCD_Module

[dandlion1]

Thank you.
I tried the Sketch in the link you supplied.
Since it was for a 16x2 display, I changed the code from
LiquidCrystal_I2C lcd(0x27,16,2);
to
LiquidCrystal_I2C lcd(0x27,24,4);

Either way, it does not work. I get the same result as I specified in my first post.

Sample Sketch for 24x4 Display.jpg (143.36 KiB) Viewed 283813 times

[techsupport]

I think you first operation is right，LiquidCrystal_I2C lcd(0x27,16,2); you can try it again,
If the back-light still come on for a while - then blink - then go off,
You can adjust the potentiometer of blue and press the reset button.

[Wilbur1225]

As the pin resources of Arduino controller is limited, your project may be not able to use normal LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface LCD module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It is fantastic for Arduino based project.

[irenejacob]

You need to design program and connect all pins of LCD display and Arduino board correctly.

[daisyfaith]

You need to design program and connect all pins of LCD display and Arduino board correctly.

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