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'[PICLIST] (EE): Please Help - LCD Not Working'
2001\03\21@093528 by -8859-1?q?Robert=20Sochon?=

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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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2001\03\21@094736 by D Lloyd

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part 1 2361 bytes content-type:text/plain; charset=us-ascii
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 <.....goatpicsKILLspamspam@spam@YAHOO.CO.UK>KILLspamspam@spam@MITVMA.MIT.EDU>> image moved   21/03/2001 14:36
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pic23588.pcx)





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Subject:  (EE): Please Help - LCD Not Working

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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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2001\03\21@095153 by David VanHorn

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At 02:36 PM 3/21/01 +0000, 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


It's a common problem with these.
They are very exacting about the init sequence. One wrong step, and you get
nothing.

Also, you need to observe some setup and hold times, which aren't too well
documented, and seem to vary a bit from vendor to vendor.

First, get a spec sheet on the 44780 controller.
Then at least double all specified delays (longer will not get you in trouble)

Then very carefully, step through the full init, exactly as in the manual.


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2001\03\21@100025 by BENEDICIC SAMO

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Hi!

Try the circuit here  http://www.epemag.com/frmlib.htm .Regards, Samo

-----Original Message-----
From: pic microcontroller discussion list [RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU]On
Behalf Of Robert Sochon
Sent: Wednesday, March 21, 2001 3:36 PM
To: spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU
Subject: (EE): Please Help - LCD Not Working


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
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2001\03\21@110421 by Ken Godee

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Try these two urls, they will give you everything you need
from start to finish, datasheets and pic examples, etc.

http://home.iae.nl/users/pouweha/lcd/lcd.shtml
http://www.geocities.com/dinceraydin/lcd/fin.htm

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2001\03\21@130536 by Art Hanson

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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:

{Quote hidden}

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