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Halloween day is coming soon, we decide to DIY a "Haunted House" to scare somebody. As we all like to watch horror movies, and I want to design a story plot like movies show.

Here is my Haunted idea: In a small and quiet dark room, there is a lonely lamp still glowing, at the same time our workmate opens the door and walk into the room, and he or she tries to do some reading, but something strange happenes, the lamp suddenly turns off. After a few seconds later, a woman‘s face will appear on a white wall with a terrifying laughter.

We decide to design two parts. A receiving stimulation part and reaction part. we need to control the lamp to turn on/off. and the reaction part will make the scared woman's face appear on the wall. and i decide to use a projector to help us. Cover the projector with a bezel when no stimulus is received, and stimulate to open the bezel.

So, now let's think about how to achieve this.