For fun and research you can make your own simple "lie detector" - a device which measures the leven 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.
For complete details on making your own version, head over to the project page. And for more, we're on facebook, Google+, and twitter - so follow us for news and product updates as well.
Looking for a rapid-use LCD for your Arduino or compatible development boards such as the example above? Save time and move forward with the Freetronics LCD & Keypad shield which contains a bright 16x2 character LCD and five buttons that can be read from only one analogue input pin:
