My first ATM which uses 3 motors, 2 touch and a light sensor! Using only 1 RCX! The two touch sensors controled a pin for each account eg. acount 1 pin=1234. Once you had entered 1 of the pins you could withdraw money! On the display what ever number it said it would give you that amount! Say it said 7 on the display, it would break it down in to 5's and 1's. So for sevn it would give you a 5 pound note and 2 1pound coins!
Down to the motors! 1 motor drove the pound coins going 0.1 of a sec for each coin. Another motor drove the notes and another for the card reader(not used)!
The card reader was designed so that a light sensor would red blocks of black and white on a card and could match a card with a pin to make it harder to get money out of!