im thinking of building an electric lock on my door a one which you will need to enter a code, which will be displayed on a small 16X2 charcter lcd screen, the password will be entered with a 4X4 keyboard and a engin will be installed on my lock so only when i press the right code the engine will turn(the engine is of course hooked up to a relay) but heres the problem i cant seem to find a cheap and simple processors,controlers which will be able to control these thing, asaid from controlling an lcd, an engine and scaning the keyboard, i also need it to have memory for the password so if i desire to change the password i will be able to.
please help