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Help using HC20401

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BigDumbYak

New Member
Recently i have come across a 4x20 LCD display. It is an HC20401 and there is a 16 wire connector attached to the top. What i'd like to do is interface it with a computer serial or parallel port. I know it can be done with other similar displays, but after a fair bit of searching, i have managed to find no information about it.

If anyone knows of this LCD, and/or where i can get a wiring diagram to connect it to a computer, i would be extremely grateful.

-images removed-

thank you for any assitance.
 

Exo

Active Member
And as far as programming is concerned, it's a HD44780 based LCD wich is pretty standard...

https://home.iae.nl/users/pouweha/lcd/lcd.shtml
if you do a liitle bit of searching on google you'll find complete scematics and software to connect it directly to a parallel port...
Its commonly done by casemodders, using an lcd to make the pc case look cooler
 

BigDumbYak

New Member
Thank you!

Thank you both for your help, the pages you linked to were very helpful.

I have one other question about this LCD panel. One of the sites recommends using the gameport +5v to power the LCD screen but the motherboard i am going to use does not have a gameport or pins on the motherboard for one. Is there any problems with using the +5 from the USB? If it comes down to it i can power it from the Power Supply, but if i can use USB to do it, i'd rather do that.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Re: Thank you!

BigDumbYak said:
I have one other question about this LCD panel. One of the sites recommends using the gameport +5v to power the LCD screen but the motherboard i am going to use does not have a gameport or pins on the motherboard for one. Is there any problems with using the +5 from the USB? If it comes down to it i can power it from the Power Supply, but if i can use USB to do it, i'd rather do that.

The 5V from a USB port will be fine.
 
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