I had the same problem when I first tried to interface to an LCD.  I
found out that my problem was due to:

a) I had the data lines backwards..
b) Then I added a longer delay and it worked perfectly.

You should also make sure that your setting it up in the correct
mode (4bit vs. 8bit).  At first I'd stick with 8 bit mode as it's simpler
and easier to debug.

Good Luck!

Art


On 21 Mar 2001, at 14:36, Robert Sochon wrote:

> 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
>
>
>
> ____________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk
> or your free @yahoo.ie address at http://mail.yahoo.ie
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body