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Hi,

If you want to prove your LCDs, it is pretty easy to use one of the PC
parallel port<->LCD tutorials you find on the web (David Tait's, for one).
If the LCD will not initialise, then try setting outputs during the
initialisation stage and checking the relative timing on a digitial scope
(if available).

Like I said earlier, getting these things to initialise is usually hit and
miss with the timing.....

Alternatively, you could always send each init instruction in the sequence
every second to make sure it is not a timing issue....

Again, 99% of the time it is timing, especially if you are using someone
else's code.....check the delays between initialisation instructions.

I think pretty much everyone has been there on getting their first LCD to
go.....afterwards, you never seem to have any trouble (!) but that is life.

Dan







 (Embedded     Robert Sochon <goatpics@YAHOO.CO.UK>@MITVMA.MIT.EDU>
 image moved   21/03/2001 14:36
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Subject:  (EE): Please Help - LCD Not Working

Security Level:?         Internal


Hello,

I am new to this lark! SO don'ty be nasty please!

I have a 20*2  HD44780 Character LCD that is showing
little signs of life. I have tried everything in the
book to get it to work, Tried a maual test circuit -
as in Christian Burrows FAQ about LCD's

(http://www.teleport.com/~raybutts/lcd-faq.htm)

 and also tried a pic, But it still doesn't work! - I
go throught the power up routine, but then i get
nothing, or a black line if i turn the contrast right
up, HAs anyone had any similar problems or is it
osmerthing that just happens, I have two LCD's and
they both od the same thing! - Where am I going wrong?

any help would be greatly asppreciated! As i need to
finish soon! - IT is a college project!

Thank you once again

Robert



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