June 2011
Intermediate to advanced
320 pages
6h 39m
English
Content preview from 15 Dangerously Mad Projects for the Evil GeniusBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 7Laser-Grid Intruder Alarm
LASER BEAMS LINE THE ENTRYWAY to the Evil Genius’ Lair (Figure 7-1), forcing the secret agent to bend and arch through the beams in a series of agile moves. With skills honed by years of Twister and limbo dancing, the agent navigates his way through the beams. Suddenly an alarm sounds and vertical doors slam to the ground, trapping the agent. The Evil Genius triumphs again.
This is a working alarm. It uses a laser beam that bounces between mirrors attached to two walls that face each other. For instance, the entrance to the Evil Genius’ Lair. When the beam is broken, a buzzer sounds.
Note that the more ingenious ...
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