PBP and 7 segments passive LCD

[fratello]

Thank You all for reply !
I not intend to do schematics verry complicated...I look at Huang schematic and I think it's possible to re-use many of passive LCD I have. The hardware it's ok for me; I wonder if I can use my code for termometer with 7 segm. - LED with this schematic; maybe it's possible to connect DS18B20 to pin 4 of 16F648 ? "Additional step you have to include to code is to invert all LCD signals once in every 1-2ms. This way you generate needed AC waveform for the panel."
I wrote code for termometer with LED display, common anode and common cathode. Which of them will be better ?

[Gusse]

Somehow Darrel's comment reminded me why I didn't continue with passive LCD displays. Most of the passive LCD specs says max 50mV DC, even some worked OK with higher DC levels for long times without any degradations.
This was a very good comment from Darrel. Thanks!

I never did try cap de-coupling, which could work to remove DC component. Don't know if this would work but give a try.
Try for example 1-10uF caps in series on every LCD signals. If it is not working, then try to increase value.

I'l try to check this with my old passive LCD and let you know if any success...

BR,
-Gusse-

[fratello]

Another example, this time using Atmega8. Great ! I will try this ...till writting my own code in PBP.
http://www.radiolocman.com/shem/sche....html?di=63917