Technology

How-To: The Truth Meter

How-To: The Truth Meter

The Truth Meter, a project featured in MAKE Volume 26, measures small increases in sweat which indicate nervousness and other stimuli. So if you’re sleuthing to find out who left the empty milk carton in the refrigerator and your prime suspect does nothing but deny accusations, watch this video and create your own Truth Meter.

For more information about this project and a PDF of the instructions from MAKE, check out: http://blog.makezine.com/archive/2011/04/the-truth-meter-dont-sweat-it.html

Here’s a kit with the components you need to build your own: http://www.makershed.com/ProductDetails.asp?ProductCode=MSGR01

Continue Reading Matt Richardson
In the Maker Shed: Arduino Nano 3.0

In the Maker Shed: Arduino Nano 3.0

The Arduino Nano 3.0 is a surface mount breadboard compatible version of the ever-popular Arduino micro controller. It’s small, has integrated USB, and is breadboard friendly. It has more or less the same functionality of the Arduino Duemilanove, but in a different package. Physically, it’s missing the power jack, but it can still sense and […]

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Make: Projects – Cable Dyeing

Make: Projects – Cable Dyeing

If you want an extension cord, power cord, or other plastic-insulated cable in an unusual color, and you can find one in white, there’s a good chance you can dye it to suit your preference using this technique.

Turns out many cables are sheathed with PVC, and will take the same oil-based stains as PVC pipe. If you want a purple cord, for instance, you can just treat a white PVC cord with purple primer. If you want some other color, it is easy to prepare your own custom stains from clear PVC cleaner and concentrated solvent dyes.

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The Truth Meter: Don’t Sweat It

The Truth Meter: Don’t Sweat It

When you feel nervous, excited, surprised, or otherwise aroused, you experience galvanic skin response (GSR). Your sweat glands, in responses to adrenaline and other hormones, start to release micro pulses of sweat. GSR is one component of polygraph tests because it’s an indicator of how nervous a question makes you feel. The increase in sweat […]

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