Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

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dandlion1
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Joined: Sat Jun 28, 2014 8:51 am

Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by dandlion1 » Sat Jun 28, 2014 9:09 am

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.

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techsupport
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Re: Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by techsupport » Mon Jun 30, 2014 10:47 am

hi,dandlion, You can refer to the following link:
http://www.geeetech.com/wiki/index.php/ ... LCD_Module
Your real trustworthy partner in China!!
Email: forum@geeetech.com

dandlion1
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Joined: Sat Jun 28, 2014 8:51 am

Re: Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by dandlion1 » Mon Jun 30, 2014 12:01 pm

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
Sample Sketch for 24x4 Display.jpg (143.36 KiB) Viewed 21177 times

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techsupport
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Re: Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by techsupport » Mon Jun 30, 2014 6:08 pm

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.
Your real trustworthy partner in China!!
Email: forum@geeetech.com

Wilbur1225
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Re: Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by Wilbur1225 » Fri Oct 14, 2016 12:37 pm

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
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Joined: Fri Aug 25, 2017 6:34 pm

Re: Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by irenejacob » Fri Aug 25, 2017 6:47 pm

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

daisyfaith
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Joined: Thu Jun 28, 2018 1:10 pm

Re: Serial Interface IIC I2C TWI 2004 204 20x4 LCD Dis

Post by daisyfaith » Thu Jun 28, 2018 1:16 pm

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


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