Your friends never believe the things you say, and you want to prove once and for all that you’re for real. The solution? Obviously you should build a lie detector into your shirt. Allow me to introduce VeraciT: the t-shirt that’s also a lie detector.
Okay, so it’s not really a full-on polygraph, since all it measures is galvanic skin response, and in any case polygraphs can’t actually detect lies. But at least it looks kinda cool, if I may say so myself.
The LED on the front shows the wearer’s GSR. It shines in varying shades of purple: the more blue it is, the higher the wearer’s skin conductivity; the more red it is, the lower the skin conductivity. The idea behind using GSR in lie detectors is that when the subject gets nervous they (supposedly) sweat slightly more, and so their skin conductivity increases. As you can see, in the picture the light is shining bright blue, which means I am telling a filthy fib.
The shirt measures GSR through two electrodes in the shoulders. The “electrodes” are actually quarters duct taped to some telephone wire I found in the basement. I try hard to stay true to the ghetto-fab ethos. Aside from that, the only electronics involved are the LED, some resistors soldered into a PCB, a bunch more telephone wire, and of course an Arduino. The shirt itself I found on a discount rack somewhere in Kenwood mall and then spray painted; the window on the front is some plastic that I cut out of a folder from Staples.
So, in the end, the VeraciT won’t actually prove to your friends that you’re telling the truth. But it will prove that you’ve got a well funky shirt.
Many thanks to the inimitable Josh Brown for loads of help on the project.