Help for my project(16f877,2x16LCD,)

[skimask]

but the word "value" always flickering , why ?

Probably because something is overwriting it or clearing the screen, then you re-print the VALUE on the LCD...

as i said before , whene there is 5V , i don't want any bars , there must be full bars at 3.9V

Simple math
Minimum = 5V (1023 ADC counts)
Maximum = 3.9V (798 ADC counts)
Spread = 1.1V (225 counts)
raw = 1024 - raw 'flips the value upside-down
raw = raw / 14 '14 counts per box, assuming 16 boxes
Surely you can do something with that...

[karamastik]

Okey my friend , thank you for your patience and for your helps
Today is enough for me ;
i'm working about this project from 9 o'clock to now.
I think , it's time to make my brain free.
And one last question ; i don't know that you are interested in integrated circuits; if you are ; i want to ask something.
I have 2 op-amps LM358 and i learned that , the maximum supply current for LM358 is 600mA . I have a power supply with 6-9-12-15 adjustable ; and it says , it can give a current of 2.5A
So, if i connect it to my op-amps , do they blow out ?
Thank you .

[mackrackit]

The op amps will be fine. The PS rating is the maximum it can handle, the op amps will only draw what they need.

As for the flicker, you need a pause of maybe 100 in the loop.