Geeetech

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.

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

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.

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.

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.

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

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

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