EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: stevetob67 on July 16, 2020, 11:28:48 am
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Hello,
I am looking for some help please, I have seen some messages regarding a HD### model of these 40x4 LCD modules but there is a difference with the number of pins on the opposing end as the 2x8 pin rows. I was hoping someone has seen these modules around, I have got my hands on three of these, for some reason a couple of eBay sellers are selling the HD### models for around $40 AUD or so but these TM404ABA1 (TM404) versions are heading up around the $200 AUD price point. I don't for a minute believe they are this expensive but I picked them up in a grab bag from someone clearing some of their excess stock.
I am looking to find a library that might work with Arduino as well as a pin description if anyone is able to help please, and help would be greatly appreciated however small. Hopefully the pictures are viewable and helpful.
https://drive.google.com/file/d/1mf54eNUThIGFOZvv5O9Fq8H5ZFX2qxCQ/view?usp=sharing (https://drive.google.com/file/d/1mf54eNUThIGFOZvv5O9Fq8H5ZFX2qxCQ/view?usp=sharing)
https://drive.google.com/file/d/1mrNVR_F6tUdTp20uU5x6WhwCyc-CnsOB/view?usp=sharing (https://drive.google.com/file/d/1mrNVR_F6tUdTp20uU5x6WhwCyc-CnsOB/view?usp=sharing)
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if you are still looking 2 years later, or for those that end up here from Google,
The library is call LiquidCrystal440. Finding it without the name is rather difficult. I was written by Donald Weiman (floresta on some forums) back in 2009 or so. It basically was a mod of the standard LCD libray to account for the two 2x20 LCD. He had a site with some good information on the HD44780 displays. It is in archive heaven now -https://web.archive.org/web/20161104194254/http://web.alfredstate.edu/weimandn
Mike
EDIT: just make sure of the 2 row connector. There are three version that I know of, two are sort of inverse of each other.