How to use this Cellular LCD Display

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#2
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.
 
#3
Stu said:
pin 3 is the contrast (should be grounded).
Click to expand...

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
 
#4
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.
 
#8
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.
 
#9
Stu said:
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.
Click to expand...


Do you have any idea about how it's function ??? Any Links ?
 
#10
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.
 
#11
Stu said:
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.
Click to expand...

My LCD Display have 14 pins. My Idea is to connect to PC parallel port and programming it from PC.
 
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