Can anyone help me to understand how to read the value of potentiometer on the LCD? I managed to get time and Hello world displayed on my 16x2 LCD, but would like to read the pot value too.
Read the data-sheet of your display. That's the way how this kind of questions are answered and this is a perfectly good example to start learning how to do this. If you find no mention of a potentiometer, it might be there to control the backlight level and not available for reading. But again, nobody will know, except you if you start reading the data-sheet.