Newbie level 2
i am doing a simple project on home security system. it consists of keypad(4*4),lcd(16*2), stepper moter, uln 2003, 89v51rd2. as a begginer , i dont know how to interface the keypad,lcd,stepper motor to 89v51rd2. please suggest me how to interface. program is ready with me but i dont know the pin connections exactly, to give.