3
the laser security fence
In this chapter, you’ll build an intrusion detection system that sounds an alarm if an intruder crosses a certain boundary. For it to be useful, you’ll need to build a device that can detect objects at a distance of several meters—the width of the approach to a doorway, at least. The MINDSTORMS EV3 Infrared Sensor, used in Chapter 1 for the Motion-Activated Critter Cam, can detect only objects that come pretty close to the sensor. To warn you of approaching people, you’ll build a Laser Security Fence that uses the LEGO-Compatible Laser from the previous chapter to project a line and then sounds an alarm if an intruder crosses that line.
building the laser security fence
The Laser Security Fence is composed of two parts: ...
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