hi ..
can i edit the lcd library and add the turkish letters in the library
thank you 
No. You can add up to eight custom characters using the 'createChar()' function but that's it.
Don
why no ?
Because the characters in a LCD module are in the device, not in the library. You can have up to 8 characters that you define from your code as a bitmap. These are also put in the device but by the library.
is there any way to edit the characters in the device ?
In theory there is, in practice it is not at all simple without the manufacturer changing it. You can google 'lcd module character ROM' and get lots of data.
ok >> big thanx