Negative Transmissive Backlit LCD

[mc2880]

Are there anyplans to use this style of display on your serial line

OR

can you direct me to how i can hook this display upto my computer

i'm a novice at programming and electronics but i can work my way around most things just gotta be given a little direction :)

Any Help will be apreciated

thanks,
Mc

[CF Tech]

We currently do not have plans to make a negative transmissive backlit version of the serial displays. Technically it is not a problem, it is just a matter of demand and cost.

Here is a link that shows connecting a parallel LCD to a PC's parallel port.

http://lcdproc.omnipotent.net/hardware.php3

The way that the LCD is connected to the parallel port must match the software that drives the LCD, so I would recommend that you find software that supports the parallel display, then connect it according to that software's requirements.

[mc2880]

Thanks for your help, i found a page from your link section :

http://www.beyondlogic.org/parlcd/parlcd.htm

It gives a simple source code i can work with and a pin wiring guide looks like the route i'm gonna take, just gotta order that display now :)

[Uller]

v2.0 of LCDriver (which supports 44780 based LCDs on a parallel port) will use this hookup.

http://lcdriver.pointofnoreturn.org/lcd44780.gif

This is the hookup for every other Windows-based 44780 software, and there are patches out there to let lcdproc use this wireup under Linux.

[DETN8R]

i see i need a 100ohm variable resistor, is it ok if i just use a 100ohm resistor?

[CF Tech]

The 100 ohms controls the amount of current through the backlight, and therefore the brightness. Please see this thread (http://www.crystalfontz.com/forum/showthread.php?threadid=62) for an explanation on how to calculate the value for that resistor.

We do not recommend using a potentiometer alone, since it is easy to set the potentiometer to 0 ohms and drive more than the rated current through the backlight LEDs. A potentiometer in series with the calculated resistor is fine, since it will allow dimming the backlight while still limiting the maximum current to a safe value.

[DETN8R]

the potentiometer controlled the LCDS contrast, and this controls the backlight? while i had my LCD working i turned the potentiometer up all the and down all the way and it didnt damage the LCD more than i already had. im guessing i need the 50ohms of resistence that CaseETC recommended right here dont I?

[Ivar]

Note that the schematic here is 4bit. http://lcdproc.omnipotent.net/hardware.php3