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Lie Detector How can an Evil Genius be sure that their prisoners are telling the truth? By using a lie detector, of course. This lie detector (see Figure) uses an effect known as galvanic skin response. As a person becomes nervous—for example, when telling a lie—their skin resistance decreases. We can measure this resistance using an analog input and use an LED and buzzer to indicate an untruth. We use a multicolor LED that will display red to indicate a lie, green to indicate a truth, and blue to show that the lie detector should be adjusted by twiddling the variable resistor. There are two types of piezo buzzers. Some are just a piezoelectric transducer, while some also include the electronic oscillator to drive them. In this project we want the former type without the electronics, as we are going to generate the necessary frequency from the Arduino board itself. Hardware The subject’s skin resistance is measured by using the subject as one resistor in a potential d...
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