Take the 2-minute tour ×
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's 100% free, no registration required.

I bought some text LCD modules without spec sheets or obvious part numbers. They all have a series of connector pins, unlabelled other than a 1 to indicate pin 1. I was able to get the one with a Hitachi driver and 16 pins to work fine, and now I'm trying to get a 9-pin lcd to work.

Is there a standard pinout for most 9-pin LCDs?

Pin 8 is clearly A for anode, possibly for backlight. Pin 9 is K for cathode, again possibly for backlight. The other 7 pins are unlabelled besides the 1 and 9 indicating pin numbering.

There is a sticker on the back that reads:

UC164904
-GLHTX-A
97051306

And another that says 847845740. There is a Samsung logo as well. The controller circuit is covered with that hard black protective material that I typically see on cheap devices, so I can't see the controller at all.

If the faint outline I can see on the screen is right, it looks like its 16 columns x 4 rows.

share|improve this question
    
The black lump on the back of the display module is most likely covering the display controller chip and not a general MCU. –  Michael Karas Jan 7 at 11:27
    
@MichaelKaras Right. Edited the post, as I meant the display controller. –  mouseas Jan 7 at 19:48
add comment

1 Answer 1

A search for UC164904 lead to this page which shows a 20x4 SPI LCD

enter image description here

enter image description here

share|improve this answer
    
That looks like it has 1 data pin instead of 4 or 8 like the standard 16-pin lcds. I'm guessing Arduino's LiquidCrystal library won't work with that as-is? –  mouseas Jan 7 at 20:00
    
@mouseas This is a new question so you shouldn't add it as a comment to an answer. alexan_e was kind enough to search for your LCD's part number for you but you shouldn't assume that alexan_e is also familiar with Arduino libraries. The best approach is to open a new question and give it an Arduino tag. That's also more helpful to other visitors to EE.SE. –  Joe Hass Jan 7 at 21:05
1  
@mouseas The SPI protocol has two data pins (MISO/MOSI), one clock (SCLK) plus one chip select (CS). As joe suspects I'm not familiar with arduino since I code using avrstudio but if your library is meant to be used with the classic 4/8bit data lines then it will not work unless you modify it. –  alexan_e Jan 7 at 21:20
    
Just knowing that it is set up for SPI protocol helps a ton. Thanks! –  mouseas Jan 8 at 17:09
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.