Lie Detector with Arduino

I’ve invited some fellow writers for dinner and books went missing.

Instead of sending who-stole-the autobiography-of-Klaus-Kinski email. I’ve decided to make a Nano Lie Detector (AKA Polygraph) for next dinner.

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Theory

A polygraph is a device that measures physiological indicators while a person answers a series of questions. Deceptive answers will produce certain physiological responses that can be differentiated, for example: increased heart rate and changes in sweat gland activity (galvanic response)

There is a cheap sensor to measure heart rate and with some easy to find parts, a galvanic response sensor can be made. Arduino will measure both sensors and presents the information using a vintage analog vu-meter. If galvanic response is high enough, a buzzer will provide an audio alert as well.

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Parts

Analog Vumeter x2 https://amzn.to/2EPgXez

Arduino Nano https://amzn.to/3ih8mQw

Heart Rate sensor https://amzn.to/2Dq3Os0

Jumper cables

Aluminum foil

Switch

Buzzer

5V power source

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Demo

https://twitter.com/RoniBandini

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Writer :: Maker :: Musician

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