A fully functional Lego NXT Automatic Teller Machine (ATM) with change making capability. The machine is built 100% from Lego® parts plus a HiTechnic IRLink and a Codatex RFID Sensor. The machine is programmed in Not eXactly C (NXC) and has the following features.. Bill scanner can be calibrated to accept any type of banknote Machine accepts only the type of bill for which it is calibrated Tolerances for bill acceptability are adjustable directly on-brick Viewable histogram compares calibration and live data from bill scanner Functional numeric keypad uses a combination of touch and light sensors Entire customer database is restored from flash memory at startup Customer database is automatically saved after each transaction ATM card is retained if wrong PIN code is entered three times ATM card is retained after a period of inactivity Coin and banknote value can be configured directly on-brick Uses a custom created 9×13 pixel rotated text font NXT buttons function as selectors for menu options displayed on-screen