How to use this Cellular LCD Display

PicancoNet · 23rd January 2004, 11:42 AM

I have a maxtor LCD Display

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

Anyone can help me ?

I want to control it from my db25 port on PC

Stu · 23rd January 2004, 01:53 PM

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.

mcs · 23rd January 2004, 03:06 PM

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

Stu · 23rd January 2004, 03:33 PM

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.

MWP · 24th January 2004, 02:27 AM

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

davesaudio · 24th January 2004, 03:47 AM

I also suspect its graphic or I2C
whats the part number ?

PicancoNet · 26th January 2004, 04:34 AM

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

Stu · 26th January 2004, 12:45 PM

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.

PicancoNet · 26th January 2004, 04:35 PM

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 ?

Stu · 27th January 2004, 03:44 AM

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.

23rd January 2004, 11:42 AM	#1
PicancoNet diyAudio Member Join Date: Jan 2004 Location: Rio de Janeiro, RJ	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). It´s have 14 pins. Anyone can help me ? I want to control it from my db25 port on PC __________________ Sounds Goods

24th January 2004, 03:47 AM	#6
davesaudio diyAudio Member Join Date: Feb 2003 Location: GTA	I also suspect its graphic or I2C whats the part number ? __________________ intentionally blank

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23rd January 2004, 01:53 PM	#2
Stu diyAudio Member Join Date: May 2003 Location: Wollongong	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.

23rd January 2004, 03:33 PM	#4
Stu diyAudio Member Join Date: May 2003 Location: Wollongong	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.

24th January 2004, 02:27 AM	#5
MWP diyAudio Member Join Date: Oct 2002 Location: Adelaide, South Australia	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

26th January 2004, 12:45 PM	#8
Stu diyAudio Member Join Date: May 2003 Location: Wollongong	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.

27th January 2004, 03:44 AM	#10
Stu diyAudio Member Join Date: May 2003 Location: Wollongong	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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