Project by Masteruan from Instructables dot com.
For fun and research you can make your own simple “lie detector” – a device which measures the level of skin conductance of the user with two simple sensors. The theory of lie detection in this instance is that the greater the conductance – the increased chance the subject under test isn’t telling the truth.
Nevertheless the device is easy to make and would be fun for younger enthusiasts to experiment with – the two sensors are made from coins and connected to the Arduino’s analogue input – which can easily measure the changing skin conductance thanks to the returned voltage through the human.
Image Credit: Instructables dot com.