In order to create something interesting for Halloween, or to recreate your own movie scenes this laser maze game fits the bill. Four laser pointer beams are used and measured by an Arduino using light sensors, and when a beam is broken an alarm or flashing light is activated. A PC running processing software monitors light levels to allow for calibration and also controls sound effects. Interestingly a servo is used to physically control a mains power outlet for a flashing light (or other noisy, high voltage devices) - perfect.
When recreating your own laser mazet, consider building the external circuit on a ProtoShield - it makes your project all the more professional, and easier to enclose. We have a range of shieldsincluding basic PCBs, short versions and our ProtoShield Pro with SMD LEDs: