4x 40 LCD question?
Archiver
Posts: 46,084
Hi All!
I am new to this group and working with Basic Stamps.
I don't have much experence with writing code or
working with digital electronics.
I have a 4x40 LCD I got from allelectronic.com (Optrex
DMC40457) it has two of the HD44780A00 on it. I have
only been able to write to the top two lines and the
3ed and 4th just get garbage or display nothing. Does
anybody have any code I can use to get all four lines
working?
Thanks for your help!
John Williams
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I am new to this group and working with Basic Stamps.
I don't have much experence with writing code or
working with digital electronics.
I have a 4x40 LCD I got from allelectronic.com (Optrex
DMC40457) it has two of the HD44780A00 on it. I have
only been able to write to the top two lines and the
3ed and 4th just get garbage or display nothing. Does
anybody have any code I can use to get all four lines
working?
Thanks for your help!
John Williams
__________________________________
Do you Yahoo!?
Yahoo! Domains – Claim yours for only $14.70/year
http://smallbusiness.promotions.yahoo.com/offer
Comments
-- Jon "No 'h' in my name" Williams
-- Parallax
Original Message
From: John Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VzvKh8BEDQ1cfPIHCnM48vmz2-nqdnJ8E_ZaH-YNYvfZnk-lynVIcXo9-38E75DS4DZ8UhqhYUvWy8TO]jrocco361@y...[/url
Sent: Monday, May 24, 2004 7:23 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] 4x 40 LCD question?
Hi All!
I am new to this group and working with Basic Stamps.
I don't have much experence with writing code or
working with digital electronics.
I have a 4x40 LCD I got from allelectronic.com (Optrex
DMC40457) it has two of the HD44780A00 on it. I have
only been able to write to the top two lines and the
3ed and 4th just get garbage or display nothing. Does
anybody have any code I can use to get all four lines
working?
Thanks for your help!
John Williams
__________________________________
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Sorry for the confusion about our names but ya know
what it's like having a common name. No I did not do
the music for Star Wars but I do wish I had his money
[noparse]:o[/noparse])
like I said I am new at this. All my experence has
been in the analog world. I saw that both the upper
two lines are $80 and $C0 but it shows that both the
lower two lines also start with the same. I figure
that that is normal as it uses two of the HD44780's so
I assume that I have to address the second as the
second or the upper is "0" and lower is "1". Do I have
to send the info as if I am writing to two different
displays. Enable E1 to write to the top two and enable
E2 to write to the bottom? If you can point me in the
right direction it would be a big help.
Thanks for your help!
John Williams (with the H)
--- Jon Williams <jwilliams@p...> wrote:
> Are you initializing the display for multi-line use?
>
> -- Jon "No 'h' in my name" Williams
> -- Parallax
>
>
Original Message
> From: John Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=EEzoDureEJf-wDcPG9D04F-EjN2iu8s8cwis5X4L8mDkU97BRMrSi5nITXf4fpcou-UeCvnI3ItgeVUXoA]jrocco361@y...[/url
> Sent: Monday, May 24, 2004 7:23 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] 4x 40 LCD question?
>
>
> Hi All!
>
> I am new to this group and working with Basic
> Stamps.
> I don't have much experence with writing code or
> working with digital electronics.
> I have a 4x40 LCD I got from allelectronic.com
> (Optrex
> DMC40457) it has two of the HD44780A00 on it. I have
> only been able to write to the top two lines and the
> 3ed and 4th just get garbage or display nothing.
> Does
> anybody have any code I can use to get all four
> lines
> working?
>
> Thanks for your help!
> John Williams
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Domains - Claim yours for only $14.70/year
> http://smallbusiness.promotions.yahoo.com/offer
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject
> and Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> This message has been scanned by WebShield. Please
> report SPAM to
> abuse@p....
>
>
>
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write to the upper and lower halves separately (hassle). This also
means that each half needs to be initialized. It's not tough, it just
requires a lot of redundant code.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: John Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8qTB7ww6G7r1uFDv95QPpltU1lttcyY_FiVri8dkUennFfq__ZnhvczR4qczjIVL3-yknfa9n1WT]jrocco361@y...[/url
Sent: Monday, May 24, 2004 5:42 PM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] 4x 40 LCD question?
Hi Jon!
Sorry for the confusion about our names but ya know
what it's like having a common name. No I did not do
the music for Star Wars but I do wish I had his money
[noparse]:o[/noparse])
like I said I am new at this. All my experence has
been in the analog world. I saw that both the upper
two lines are $80 and $C0 but it shows that both the
lower two lines also start with the same. I figure
that that is normal as it uses two of the HD44780's so
I assume that I have to address the second as the
second or the upper is "0" and lower is "1". Do I have
to send the info as if I am writing to two different
displays. Enable E1 to write to the top two and enable
E2 to write to the bottom? If you can point me in the
right direction it would be a big help.
Thanks for your help!
John Williams (with the H)
--- Jon Williams <jwilliams@p...> wrote:
> Are you initializing the display for multi-line use?
>
> -- Jon "No 'h' in my name" Williams
> -- Parallax
>
>
Original Message
> From: John Williams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8qTB7ww6G7r1uFDv95QPpltU1lttcyY_FiVri8dkUennFfq__ZnhvczR4qczjIVL3-yknfa9n1WT]jrocco361@y...[/url
> Sent: Monday, May 24, 2004 7:23 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] 4x 40 LCD question?
>
>
> Hi All!
>
> I am new to this group and working with Basic
> Stamps.
> I don't have much experence with writing code or
> working with digital electronics.
> I have a 4x40 LCD I got from allelectronic.com
> (Optrex
> DMC40457) it has two of the HD44780A00 on it. I have
> only been able to write to the top two lines and the
> 3ed and 4th just get garbage or display nothing.
> Does
> anybody have any code I can use to get all four
> lines
> working?
>
> Thanks for your help!
> John Williams
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Domains - Claim yours for only $14.70/year
> http://smallbusiness.promotions.yahoo.com/offer
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject
> and Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
> This message has been scanned by WebShield. Please
> report SPAM to
> abuse@p....
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject and Body of the message will be
> ignored.
>
> Yahoo! Groups Links
>
>
> basicstamps-unsubscribe@yahoogroups.com
>
>
>
__________________________________
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Friends. Fun. Try the all-new Yahoo! Messenger.
http://messenger.yahoo.com/
To UNSUBSCRIBE, just send mail to:
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abuse@p....
wrote:
> Hi All!
> I have a 4x40 LCD I got from allelectronic.com (Optrex
> DMC40457) it has two of the HD44780A00 on it. I have
> only been able to write to the top two lines and the
> 3ed and 4th just get garbage or display nothing. Does
> anybody have any code I can use to get all four lines
> working?
> Thanks for your help!
> John Williams
Another John (Jon?) Williams...Hmmm, this is bound to cause some
confusion. ;-) To answer your question; 4 X 40 LCDs have 2 Enable
lines, and they must be strobed for each half of the display you
wish to write to. Each half works exactly as the other, with the
exception of needing separate Enable lines (Thus an extra pin from
the BS2).
What we need is a Serial Backpack chip that supports 4 X 40 line
displays.
Chris Savage
Knight Designs