help with a hd44780


New member
Welp i have searched the forums and can't find a question similar to mine, so here it goes...

I have the CFAH2004A, and have just finished wiring it up, and when initializing it or sending chars to it to display, I am getting jumbled squares and lines. Here is a picture.

I have checked my wiring, and have used multiple different pieces of software, with all the same results.

Thanks in advance!

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CF Support

We do not recommend the parallel modules (such as the one you are interested in) for end-user PC applications. These modules require more extensive wiring knowledge and the proper tools. These modules are primarily intended for OEM (manufacturer) use, and as such, we do not carry any cables, brackets, or serial adapters for these modules.

We do not offer end-user tech support on the CFAH*, CFAG* or CFAP* series modules in PC applications. We will not accept returns on CFAH*, CFAG* or CFAP* modules damaged in an attempt to connect them to a PC.

The serial/USB modules and kits (634, 633, 632 models and kits: are best suited for PC applications.

Please see this forum thread for our PCuser LCD recommendations:

The end sum is:
Check your wiring, again. :(

Good wiring guides for HD44780 compatible LCD's can be found:

You can also go to and search for "assuming alphanumeric" and you will find a short Q/A post on parallel displays.