CHAPTER 9Miscellaneous Projects
THIS CHAPTER IS JUST A collection of projects that we can build. They do not illustrate any particular point except that Arduino projects are great fun to make.
Project 26Lie Detector
How can an Evil Genius be sure that his or her prisoners are telling the truth? By using a lie detector, of course. This lie detector (Figure 9-1) uses an effect known as galvanic skin response.
Figure 9-1 Project 26: lie detector.
As a person becomes nervous—for example, when telling a lie—his or her skin resistance decreases. We can measure this resistance using an analog input and use an LED and buzzer to indicate an untruth.
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