Re: What voltage and current to control 1 segment of LCD ?

From: hihihi (SeeSignature_at_ForEmailAddress.nl)
Date: 07/02/04 

Date: Fri, 02 Jul 2004 22:11:55 +0200

John Fields wrote:

> oscilloscopeeJul 2004 14:16:27 +0200, hihihi
> <SeeSignature@ForEmailAddress.nl> wrote:
>>I am trying to connect this signal, via a opto-coupler, to a serial or
>>parallel port on a computer.
>>Then make a prog which converts the pulses to a number on screen.
>>
>>Who needs a LCD screen when you can have the measured data inside a
>>computer :-)
>
> ---
> Good luck...
>
> What you may not know is that in order to capture the LCD drive
> properly there are two signals you need to consider, the segment drive
> and the backplane drive.

Its easier then that.
You do not need to mess with the LCD or its drivers.
Here is a picture of the signal to the drivers.
http://home.wanadoo.nl/hihihi/tp5008/pictures/0volt.dat.png
Made with a very slow oscilloscope card :-)

It contains all the info displayed on the lcd.
Its like a I2C or SPI signal.

I have allready connected it to the pin 13 of the parallel port.
Now i have to figure out what the signal says :-) 

-- 
Email address: hihihi wanadoo nl
Replace the spaces with @ and .

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