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Topic: LCD Shield Operation (Read 1 time) previous topic - next topic


Hi i have just bought a LCD Keypad shield from eBay.


However whenever i plug it in and try the test message of Hello World, all i seem to get is the first row appear as blocks.

in the ebay auction it doesn't have a datasheet for the shield so im not sure what pins it should be using.

I am just wondering is anyone else has bought one of these units and knows what the issue maybe.


Have you adjusted the potentiometer yet? Turn it back and forth until you can see letters.
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter


Hi Liudr,

I have tried adjusting it but nothing is displaying.

All i get is the first row appearing as blocks.

basically what i am doing is, with the LCD Shield mounted to the arduino is plugging in the USB cable. Starting the Arduino application (18) uploading the Hello World Example, then it does nothing except show the blocks on the LCD. Am i doing upload procedure correctly?


I have no idea which pin of your shield is connected to which LCD pin so a skematic or picture will help on that. Also I don't know what your hello world program contains. So unless you post that, I can't help.
Normally more people will help you if you provide enough details, instead of saying help, this thing I got isn't working.
Serial LCD keypad panel,phi_prompt user interface library,SDI-12 USB Adapter


Which sketch are you using?

You can't use the Example LCD sketch within the IDE without some editing first.

The site says it uses the LCD_4Bit library, you can try using Nuelectronics library for theres to see if it works.



Not sure if it will work, but they use a modded version of the 4bit library suggested.

:) Best of luck!


Hi CaptainObvious,

You were right. It does use the 4bit mod.
Now it seems to be working fine.


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