Is it the HD44780 based LCD? Start by displaying text on the LCD. Don't take input
from a keypad as that only complicates it further. The first place to start for information on the LCD is its datasheet. Then if you've any question about anything in the datasheet, ask here.
from a keypad as that only complicates it further. The first place to start for information on the LCD is its datasheet. Then if you've any question about anything in the datasheet, ask here.