Lcd help!!!!
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Posts: 46,084
Ok gentlemen,
I am about to pull my hair out on a parallel LCD. This is my first time to
use one and I have serious problems.
I ordered a hitachi compatible parallel LCD from Allied and hooked it up.
I cannot get this thing to work and I cannot find any good code for just
simple testing. I found some on the stampworks experiment #11 and I cant
get it to work and all the rest that I found was for the 2P, which I am not
using.
Can anyone help me out here, I would like to use the 4bit mode, but will do
8 if that is what you have.
I just dont know where to start for now and am very frustrated!
TIA
Mark
I am about to pull my hair out on a parallel LCD. This is my first time to
use one and I have serious problems.
I ordered a hitachi compatible parallel LCD from Allied and hooked it up.
I cannot get this thing to work and I cannot find any good code for just
simple testing. I found some on the stampworks experiment #11 and I cant
get it to work and all the rest that I found was for the 2P, which I am not
using.
Can anyone help me out here, I would like to use the 4bit mode, but will do
8 if that is what you have.
I just dont know where to start for now and am very frustrated!
TIA
Mark
Comments
code. I've been using LCDs with BASIC Stamp since the BS1 and I can tell you
for a fact that the StampWorks code does, in fact, work. If you're having
problems, you've either miswired or done something bogus in the code.
Go easy on yourself, it happens to the best of us. My bet is that you'll
find the mistake (after you relax) and it will seem incredibly silly. Don't
take anything for granted when you check your wiring and code. And do check
with your vendor -- some cheapie LCDs require a negative voltage on the
contrast pin....
-- Jon Williams
-- Applications Engineer, Parallax
-- Author of StampWorks
In a message dated 10/16/01 2:50:24 PM Central Daylight Time,
madams@a... writes:
> I am about to pull my hair out on a parallel LCD. This is my first time to
> use one and I have serious problems.
>
> I ordered a hitachi compatible parallel LCD from Allied and hooked it up.
> I cannot get this thing to work and I cannot find any good code for just
> simple testing. I found some on the stampworks experiment #11 and I cant
> get it to work and all the rest that I found was for the 2P, which I am not
> using.
>
> Can anyone help me out here, I would like to use the 4bit mode, but will do
> 8 if that is what you have.
>
> I just dont know where to start for now and am very frustrated!
>
[noparse][[/noparse]Non-text portions of this message have been removed]
made the mistake of sending data to 0 thru 3. The Optrex display I was
interfacing needed input on data lines 4 thru 7.
Original Message
From: Mark Adams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=TJrqy_cO5YSfw8GzuyXZ3MuPDzRdv2ooqGv3IA5INKeRSSfAeswWdBF3MHSoY4RSMVLe6Adw9irB]madams@a...[/url
Sent: Tuesday, October 16, 2001 3:48 PM
To: 'basicstamps@yahoogroups.com'
Subject: [noparse][[/noparse]basicstamps] LCD HELP!!!!
Ok gentlemen,
I am about to pull my hair out on a parallel LCD. This is my first time to
use one and I have serious problems.
I ordered a hitachi compatible parallel LCD from Allied and hooked it up.
I cannot get this thing to work and I cannot find any good code for just
simple testing. I found some on the stampworks experiment #11 and I cant
get it to work and all the rest that I found was for the 2P, which I am not
using.
Can anyone help me out here, I would like to use the 4bit mode, but will do
8 if that is what you have.
I just dont know where to start for now and am very frustrated!
TIA
Mark
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but I have it working with a 4x20 just fine. It takes serial in and even
has an AUX digital pin you can set HIGH or LOW.
http://www.j-com.net/lcd4x20.pdf
James R. Parish
J-Tech Internet Services
J-Com Enterprises, Inc.
Original Message
From: Mark Adams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=BsIIh4k5Tiqc7DOiBYIXyR5ud8lHlZLrxUJkadJ0A88i3sXqIpGSFTShpQj-kbwRcuLV281CZf3jHpfc6Q]madams@a...[/url
Sent: Tuesday, October 16, 2001 3:48 PM
To: 'basicstamps@yahoogroups.com'
Subject: [noparse][[/noparse]basicstamps] LCD HELP!!!!
Ok gentlemen,
I am about to pull my hair out on a parallel LCD. This is my first time to
use one and I have serious problems.
I ordered a hitachi compatible parallel LCD from Allied and hooked it up.
I cannot get this thing to work and I cannot find any good code for just
simple testing. I found some on the stampworks experiment #11 and I cant
get it to work and all the rest that I found was for the 2P, which I am not
using.
Can anyone help me out here, I would like to use the 4bit mode, but will do
8 if that is what you have.
I just dont know where to start for now and am very frustrated!
TIA
Mark
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you must have it wored correctly, inlcuding the connection for
contrast. (this one got me).
Doug
On 16 Oct 2001, at 14:48, Mark Adams wrote:
> Ok gentlemen,
>
> I am about to pull my hair out on a parallel LCD. This is my first
> time to use one and I have serious problems.
>
> I ordered a hitachi compatible parallel LCD from Allied and hooked it
> up.
> I cannot get this thing to work and I cannot find any good code for
> just
> simple testing. I found some on the stampworks experiment #11 and I
> cant get it to work and all the rest that I found was for the 2P,
> which I am not using.
>
> Can anyone help me out here, I would like to use the 4bit mode, but
> will do 8 if that is what you have.
>
> I just dont know where to start for now and am very frustrated!
>
> TIA
>
> Mark
>
> 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.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
I had just the same problem a few weeks ago. First, adjust the contrast pot
to the point where you begin to see the character blocs. This stupid thing
was my first problem. Second, if you use a breadboard, any bad contact will
mess the communications. So, be sure to use wires that's not too thin.
Hope this is not too late and will help...
Phil.
Original Message
From: <jonwms@a...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, October 16, 2001 11:07 PM
Subject: Re: [noparse][[/noparse]basicstamps] LCD HELP!!!!
> You can start by relaxing and checking your wiring. Then double-check
your
> code. I've been using LCDs with BASIC Stamp since the BS1 and I can tell
you
> for a fact that the StampWorks code does, in fact, work. If you're having
> problems, you've either miswired or done something bogus in the code.
>
> Go easy on yourself, it happens to the best of us. My bet is that you'll
> find the mistake (after you relax) and it will seem incredibly silly.
Don't
> take anything for granted when you check your wiring and code. And do
check
> with your vendor -- some cheapie LCDs require a negative voltage on the
> contrast pin....
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Author of StampWorks
>
>
>
>
> > I am about to pull my hair out on a parallel LCD. This is my first time
to
> > use one and I have serious problems.
> >
> > I ordered a hitachi compatible parallel LCD from Allied and hooked it
up.
> > I cannot get this thing to work and I cannot find any good code for just
> > simple testing. I found some on the stampworks experiment #11 and I
cant
> > get it to work and all the rest that I found was for the 2P, which I am
not
> > using.
> >
> > Can anyone help me out here, I would like to use the 4bit mode, but will
do
> > 8 if that is what you have.
> >
> > I just dont know where to start for now and am very frustrated!
> >
>
I found the data sheets on my hitachi compatible device to find out that
the pins were backwards... that burned up the first two stamps.
Now I have the right connections and it still does not work. I have the
unaltered stampworks code and all it displays is the first row of blocks
(solid) Now a funny thing is happening. I programmed the stamp and it
shows the blocks, but now it will not reprogram. Says it sees the stamp
but it is not responding and to check the power supply. I plugged yet
another one in, it programmed the first time and now nothing! THIS IS 4
STAMPS that have burned up now.
I am beginning to hate these LCD's and it would have been much cheaper on
the serial unit. I dont have the contrast pot in the system, I just have
it grounded along with the unused pins.
I am at a total loss and need help.
Thanks,
Mark
Original Message
From: Philippe Derenne [noparse]/noparse]SMTP:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=qeEE6sIo15Om9sbKrHLoDSjyWS3PM0_0mRpUH1U3ulif0fwTphVjAZVB7cBF5_WtJamPyij5gZxD]derennep@s...[/url
Sent: Wednesday, October 17, 2001 7:19 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] LCD HELP!!!!
Hi,
I had just the same problem a few weeks ago. First, adjust the contrast pot
to the point where you begin to see the character blocs. This stupid thing
was my first problem. Second, if you use a breadboard, any bad contact will
mess the communications. So, be sure to use wires that's not too thin.
Hope this is not too late and will help...
Phil.
Original Message
From: <jonwms@a...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, October 16, 2001 11:07 PM
Subject: Re: [noparse][[/noparse]basicstamps] LCD HELP!!!!
> You can start by relaxing and checking your wiring. Then double-check
your
> code. I've been using LCDs with BASIC Stamp since the BS1 and I can tell
you
> for a fact that the StampWorks code does, in fact, work. If you're
having
> problems, you've either miswired or done something bogus in the code.
>
> Go easy on yourself, it happens to the best of us. My bet is that you'll
> find the mistake (after you relax) and it will seem incredibly silly.
Don't
> take anything for granted when you check your wiring and code. And do
check
> with your vendor -- some cheapie LCDs require a negative voltage on the
> contrast pin....
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Author of StampWorks
>
>
>
>
> > I am about to pull my hair out on a parallel LCD. This is my first
time
to
> > use one and I have serious problems.
> >
> > I ordered a hitachi compatible parallel LCD from Allied and hooked it
up.
> > I cannot get this thing to work and I cannot find any good code for
just
> > simple testing. I found some on the stampworks experiment #11 and I
cant
> > get it to work and all the rest that I found was for the 2P, which I am
not
> > using.
> >
> > Can anyone help me out here, I would like to use the 4bit mode, but
will
do
> > 8 if that is what you have.
> >
> > I just dont know where to start for now and am very frustrated!
> >
>
To UNSUBSCRIBE, just send mail to:
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safe suggestion would be to STOP PLUGGING IN STAMPS.
You can make a lot of head way understanding your LCD without using a stamp (or
any kind of controller). You may want to read the linked EPE articles before
you go any further with stamps.
http://www.epemag.com/lcd1.pdf
http://www.epemag.com/lcd2.pdf
Good luck (and slow down).
Kevin
Mark Adams wrote:
>
> OK... still frustrated.
>
> I found the data sheets on my hitachi compatible device to find out that
> the pins were backwards... that burned up the first two stamps.
>
> Now I have the right connections and it still does not work. I have the
> unaltered stampworks code and all it displays is the first row of blocks
> (solid) Now a funny thing is happening. I programmed the stamp and it
> shows the blocks, but now it will not reprogram. Says it sees the stamp
> but it is not responding and to check the power supply. I plugged yet
> another one in, it programmed the first time and now nothing! THIS IS 4
> STAMPS that have burned up now.
>
> I am beginning to hate these LCD's and it would have been much cheaper on
> the serial unit. I dont have the contrast pot in the system, I just have
> it grounded along with the unused pins.
>
> I am at a total loss and need help.
>
> Thanks,
>
> Mark
>
>
Original Message
> From: Philippe Derenne [noparse]/noparse]SMTP:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=oHw1eZ_BggyqOnk9n9TYbHNnSyK1bO-qLdC3I71_-DpMewIXN4t0aqW6HgqM-GeJf9ZOKXJGkfZy]derennep@s...[/url
> Sent: Wednesday, October 17, 2001 7:19 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] LCD HELP!!!!
>
> Hi,
>
> I had just the same problem a few weeks ago. First, adjust the contrast pot
> to the point where you begin to see the character blocs. This stupid thing
> was my first problem. Second, if you use a breadboard, any bad contact will
> mess the communications. So, be sure to use wires that's not too thin.
> Hope this is not too late and will help...
> Phil.
>
>
Original Message
> From: <jonwms@a...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, October 16, 2001 11:07 PM
> Subject: Re: [noparse][[/noparse]basicstamps] LCD HELP!!!!
>
> > You can start by relaxing and checking your wiring. Then double-check
> your
> > code. I've been using LCDs with BASIC Stamp since the BS1 and I can tell
> you
> > for a fact that the StampWorks code does, in fact, work. If you're
> having
> > problems, you've either miswired or done something bogus in the code.
> >
> > Go easy on yourself, it happens to the best of us. My bet is that you'll
> > find the mistake (after you relax) and it will seem incredibly silly.
> Don't
> > take anything for granted when you check your wiring and code. And do
> check
> > with your vendor -- some cheapie LCDs require a negative voltage on the
> > contrast pin....
> >
> > -- Jon Williams
> > -- Applications Engineer, Parallax
> > -- Author of StampWorks
> >
> >
> >
> >
> > > I am about to pull my hair out on a parallel LCD. This is my first
> time
> to
> > > use one and I have serious problems.
> > >
> > > I ordered a hitachi compatible parallel LCD from Allied and hooked it
> up.
> > > I cannot get this thing to work and I cannot find any good code for
> just
> > > simple testing. I found some on the stampworks experiment #11 and I
> cant
> > > get it to work and all the rest that I found was for the 2P, which I am
> not
> > > using.
> > >
> > > Can anyone help me out here, I would like to use the 4bit mode, but
> will
> do
> > > 8 if that is what you have.
> > >
> > > I just dont know where to start for now and am very frustrated!
> > >
> >
>
> 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.
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
> 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.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
madams@a... writes:
> I am beginning to hate these LCD's and it would have been much cheaper on
> the serial unit. I dont have the contrast pot in the system, I just have
>
That might just be your problem -- I've found very few contrast inputs that
would work well when grounded. Connect the contrast pin to the wiper of a
10K pot that is connected between +5 and ground. With power to the display,
you should be able to adjust the contrast pot so the character positions
become visible.
Once you get your other wiring sorted out, things will probably go much more
smoothly.
-- Jon Williams
-- Parallax
[noparse][[/noparse]Non-text portions of this message have been removed]
Mark : I have the unaltered stampworks code and all it displays is the first
row of blocks (solid) Now a funny thing is happening. I programmed the
stamp and it shows the blocks, but now it will not reprogram.
John: Do you mean the program in PC just hang or what? How do you know it
will not reprogram? What do you see when you run the code?
Mark: Says it sees the stamp but it is not responding and to check the power
supply.
John: Whar carrier board are you using? Is it education board or something
else? How do you power the stamp and LCD?
Mark: I plugged yet another one in, it programmed the first time and now
nothing! THIS IS 4 STAMPS that have burned up now.
John: The previous 4 STAMPS may still be working. But how do you know those
4 has been "burned up"?
John: I am using the education board and the bread board built-in to test
the LCD. Since I use the same power as in the education board to power the
LCD, I feel more save about keeping my stamp and LCD. In some cases, I used
resistors to protect the components, too.
Relax.
John Leung
Original Message
From: Mark Adams <madams@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, October 17, 2001 11:19 PM
Subject: RE: [noparse][[/noparse]basicstamps] LCD HELP!!!!
> OK... still frustrated.
>
> I found the data sheets on my hitachi compatible device to find out that
> the pins were backwards... that burned up the first two stamps.
>
> Now I have the right connections and it still does not work. I have the
> unaltered stampworks code and all it displays is the first row of blocks
> (solid) Now a funny thing is happening. I programmed the stamp and it
> shows the blocks, but now it will not reprogram. Says it sees the stamp
> but it is not responding and to check the power supply. I plugged yet
> another one in, it programmed the first time and now nothing! THIS IS 4
> STAMPS that have burned up now.
>
> I am beginning to hate these LCD's and it would have been much cheaper on
> the serial unit. I dont have the contrast pot in the system, I just have
> it grounded along with the unused pins.
>
> I am at a total loss and need help.
>
> Thanks,
>
> Mark
input pins on the LED. p0-p3. Some programs do not document this as a
requirement for the parallel LCD's using 4 bit mode. Give it a try.
It worked for me.
--- In basicstamps@y..., Mark Adams <madams@a...> wrote:
> Ok gentlemen,
>
> I am about to pull my hair out on a parallel LCD. This is my first
time to
> use one and I have serious problems.
>
> I ordered a hitachi compatible parallel LCD from Allied and hooked
it up.
> I cannot get this thing to work and I cannot find any good code
for just
> simple testing. I found some on the stampworks experiment #11 and
I cant
> get it to work and all the rest that I found was for the 2P, which
I am not
> using.
>
> Can anyone help me out here, I would like to use the 4bit mode, but
will do
> 8 if that is what you have.
>
> I just dont know where to start for now and am very frustrated!
>
> TIA
>
> Mark
I just wanted to let yall know what happened so you dont think I am a
complete idiot.
I recieved the file that was sent and read through it on using the
intelligent displays, so I built up the circuit and tested my LCD's. It
worked properly and exactly as I would have expected it.
Ok, here is what happened. I have a large three section protoboard. I
have an active circuit on the left bank that is working properly. My LCD
problems were in the middle section and I built the working LCD test
circuit in the right section. Whenever I changed the LCD to the middle
circuit, it would burn it up and take out the stamp... so what it boiled
down to is that there was a problem (probably a short between some internal
connections) with the protoboard and it has since been replaced and all is
working well.
Thank you to all for their patience and help, and I am sorry for getting so
frustrated.
Thanks again.
Mark
Original Message
From: John Leung [noparse]/noparse]SMTP:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nlwEoT3CWIne5XwVpzGKjZa4Nv_9HgvAZrRC4UzedPXCP7C3l_XoJ5ycjbGlObA_OVU2_ijN8zB1dSXjiQ]jleung00@n...[/url
Sent: Wednesday, October 17, 2001 11:44 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] LCD HELP!!!!
Hi Mark
Mark : I have the unaltered stampworks code and all it displays is the
first
row of blocks (solid) Now a funny thing is happening. I programmed the
stamp and it shows the blocks, but now it will not reprogram.
John: Do you mean the program in PC just hang or what? How do you know it
will not reprogram? What do you see when you run the code?
Mark: Says it sees the stamp but it is not responding and to check the
power
supply.
John: Whar carrier board are you using? Is it education board or something
else? How do you power the stamp and LCD?
Mark: I plugged yet another one in, it programmed the first time and now
nothing! THIS IS 4 STAMPS that have burned up now.
John: The previous 4 STAMPS may still be working. But how do you know those
4 has been "burned up"?
John: I am using the education board and the bread board built-in to test
the LCD. Since I use the same power as in the education board to power the
LCD, I feel more save about keeping my stamp and LCD. In some cases, I used
resistors to protect the components, too.
Relax.
John Leung
Original Message
From: Mark Adams <madams@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, October 17, 2001 11:19 PM
Subject: RE: [noparse][[/noparse]basicstamps] LCD HELP!!!!
> OK... still frustrated.
>
> I found the data sheets on my hitachi compatible device to find out that
> the pins were backwards... that burned up the first two stamps.
>
> Now I have the right connections and it still does not work. I have the
> unaltered stampworks code and all it displays is the first row of blocks
> (solid) Now a funny thing is happening. I programmed the stamp and it
> shows the blocks, but now it will not reprogram. Says it sees the stamp
> but it is not responding and to check the power supply. I plugged yet
> another one in, it programmed the first time and now nothing! THIS IS 4
> STAMPS that have burned up now.
>
> I am beginning to hate these LCD's and it would have been much cheaper on
> the serial unit. I dont have the contrast pot in the system, I just have
> it grounded along with the unused pins.
>
> I am at a total loss and need help.
>
> Thanks,
>
> Mark
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