You can’t get more simple than the Galvanic Skin Response [GSR] sensor. It is just a cut 9V LEGO motor wire and some aluminum foil wrapped around your fingers with tape. I was inspired by talks by Mindfest panelists Karen Wilkinson and Mike Petrich who talked about using this type of sensor. The theory is that; the more relaxed you are the dryer your skin is and so the higher the skin’s electrical resistance. When you are under stress your hand sweats and then the resistance goes down.
This is really cool. Now anyone can make their own lie detector for not much money (assuming you already have a LEGO mindstorms kit). Nice hack!
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