[LPT ->LCD + LED... how?]

Now I have assambled all the components and it works!

The LED is connected to pin 17 and all I had do to was to modify the script so if I want the LED "on" I change the "control" value that is sent to the LPT.

Maybe I will make a schematics for my unit. If so, I upload it here.

[LPT ->LCD + LED... how?]

Yes! it seems to work with pin 17.
Now I just have to assamble all the components.

Thanks!

[LPT ->LCD + LED... how?]

I am doing this from memory, so I am not sure exactly which pins are which for base + 1 or base + 2, but I have a chart somewhere if you cannot figure it out with a little test code and an LED.

Base + 1 = inputs (pin 10,11,12,13,15)
Base + 2 = contol (pin 0,14,16,17)

I was testing some yesterday and it seems that I could use pin 17 to control the led.. Haven't tested with a LED yet, but will do that later today.

[LPT ->LCD + LED... how?]

->harsh

also i see no problem wiring the circuit as you have it above...

Do you mean as the link or the attached picture?

the chips that drive the LPT can easily handle two inputs each..

Ok... how? is it a programming thing?

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->MP

You can use the other pins of the parallel port to send data.

Are you shure?
The LCD has 14/16 pins where 10 of them are connected to the LPT (pin 1-9 + 16). Pin 10-13 + 15 of the LPT is for input. Pin 18-25 i ground. That makes only pin 14 and 17 free. But those pins are "Control"... Can I send data to, for example, pin 17 so the LED could light?

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[LPT ->LCD + LED... how?]

hmmm
the circuit may not work as planned,because when u optput a logic one to the LS373 the output will be high , which in effect will turn OFF the LED.

Ok... Is there any other way to do this?

If not, is it possible to have the led turned on/off with key 1/2 without the LPT do this? So, if i press "key 1" it both sends signal to LPT and maybe to an IC that turns the led on. And when "key 2" is pressed the LED goes off.

[LPT ->LCD + LED... how?]

Hi!

I'm trying to build a "remote-control" to my software (written in Delphi 6) with a LCD display, some keys and a LED.

What I want is:
When I press a button (on my circuit) I read that value from the LPT port and start a process in my application. The application now shows some info on the LCD (via LPT) and a LED should light.
And when I press another button, the process will stop and the LED goes off.

The buttons and LCD is working. How I write/read to/from LPT is not a problem. It is just how I should wire the hardware so I also (with some code) can light up an LED.
To light up a led without having an LCD connected at the same port is easy but because the LCD uses all the data-pins (2-9) of the LPT there is a huge problem (for me).

Schematics for the LCD and buttons that I use (not made by me) :
http://mitglied.lycos.de/MASE5/linux/lcdenglish/lcd-mit-tastatur-harware.html

I also found the attached jpg on the web... Is this useful?