How to use this Cellular LCD Display - diyAudio
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Old 23rd January 2004, 11:42 AM   #1
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Default How to use this Cellular LCD Display

I have a maxtor LCD Display

I know that the pins 1 and 3 is for power (5V). Itīs have 14 pins.

Anyone can help me ?

I want to control it from my db25 port on PC
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Old 23rd January 2004, 01:53 PM   #2
Stu is offline Stu  Australia
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I've had a bit of experience with this sort of thing, I used one with a PIC for a uni project I did last year - but if it's for a PC, you might be better off getting a program for it instead of coding it yourself, but that might depend on your needs.

Its actually pins 1 and 2 that are the power pins, pin 3 is the contrast (should be grounded).

As for the rest, if i can remember correctly, they are as follows:

4: Register select (changes the device from instruction to data mode)
5: Read/Write Mode (leave as write by pulling it low)
6:Enable (effectively the "clock")
7-14: Data

This is assuming that it is a Hitachi 44780 chipset, but that is almost certainly the case - try searching for it and you might get some advice on using it.

If you get a program for it, it should explain what connections need to be made. This link might help also:

http://www.overclockers.com.au/techstuff/a_diy_lcd/

If you are trying to program it, I might be able to give you a few tips, but it's a fair bit different throught a parallel port - communicating with the ports in windows can be a pain in the **** if you don't know what you are doing.
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Old 23rd January 2004, 03:06 PM   #3
mcs is offline mcs  Denmark
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Quote:
Originally posted by Stu
pin 3 is the contrast (should be grounded).
Never ground the contrast pin! If you do that you might chase non-existing problems for a long time... Some displays will work with 0V on the contrast pin, but most will stay blank. You need a trimmer (10k is often used) between 5V and ground, so you can adjust the contrast voltage.

Also note that some displays will need a negative voltage on the contrast pin to display anything.

Best regards,

Mikkel C. Simonsen
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Old 23rd January 2004, 03:33 PM   #4
Stu is offline Stu  Australia
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I've grounded the contrast pin on four different models without issue, but it could be considered good practice to use a potentiometer instead - it wouldn't be much more complicated, and you will be able to adjust to your tastes.

Maybe I shouldn't have said you 'should' ground it, but it is rare for this to be a problem, and it does simplify the design somewhat.
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Old 24th January 2004, 02:27 AM   #5
MWP is offline MWP  Australia
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Um, you guys are assuming its a HD44780 LCD.
It may not be.

If it is though, see my guide here:
http://www.overclockers.com.au/~mwp/...up-hd44780.htm
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Old 24th January 2004, 03:47 AM   #6
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I also suspect its graphic or I2C
whats the part number ?
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Old 26th January 2004, 04:34 AM   #7
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Quote:
Originally posted by davesaudio
I also suspect its graphic or I2C
whats the part number ?

It is not a Maxtor cellular.

It's a Nokia 7160 Display
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Old 26th January 2004, 12:45 PM   #8
Stu is offline Stu  Australia
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Whoops, ignore what I have said so far... I think I assumed that it was a Hitachi because of the same number of pins.

In my opinion, it may be too tricky to try and do something like this yourself - if you are looking for a DIY friendly display, one with the 44780 chipset I mentioned would help and has a lot of supporting information/projects you'll be able to find on the net (that may also be why I assumed you were using one). Even a simple graphic display may be a lot easier, but I don't really have any experience with those.

Maybe you'll get lucky and find someone who will be able to help you, but you might want to rethink what you are trying to do.
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Old 26th January 2004, 04:35 PM   #9
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Quote:
Originally posted by Stu
Whoops, ignore what I have said so far... I think I assumed that it was a Hitachi because of the same number of pins.

In my opinion, it may be too tricky to try and do something like this yourself - if you are looking for a DIY friendly display, one with the 44780 chipset I mentioned would help and has a lot of supporting information/projects you'll be able to find on the net (that may also be why I assumed you were using one). Even a simple graphic display may be a lot easier, but I don't really have any experience with those.

Maybe you'll get lucky and find someone who will be able to help you, but you might want to rethink what you are trying to do.

Do you have any idea about how it's function ??? Any Links ?
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Old 27th January 2004, 03:44 AM   #10
Stu is offline Stu  Australia
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There's a link near the top of the page for a fairly simple diy solution using such an LCD, but here it is again:

http://www.overclockers.com.au/techstuff/a_diy_lcd/

Here is another good one I just found (a bit more complicated though).

http://www.myrolypoly.com/lcd_project/lcd_project.html

They both use only simple character displays (i.e. not graphic), but depending on your application, that should be sufficient.

I've got a bit of an idea of how they function, but are you planning of programming it yourself or getting a custom designed program for it? That is an important factor to take into account.
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