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Experiment with an Arduino-based Lie Detector and Biofeedback monitor

Experiment with an Arduino-based Lie Detector and Biofeedback monitor

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.

What is biofeedback?

[Font: Wikipedia |]

Biofeedback is the process of gaining greater awareness of many physiological functions primarily using instruments that provide information on the activity of those same systems, with a goal of being able to manipulate them at will. Some of the processes that can be controlled include brainwaves, muscle tone, skin conductance, heart rate and pain perception.
Biofeedback may be used to improve health, performance, and the physiological changes that often occur in conjunction with changes to thoughts, emotions, and behavior.



Let’s start with the list of materials needed. You will need:

Arduino UNO


LCD 16 x 2

A temperature sensor TMP36

Two plates of copper or conductive metal

Some connection cables

Here are some pictures.




All images credit: Instructables


For complete details on making your own version, head over to the project page.