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Jordan Crittenden and Edwin Lai built this DIY Polygraph, their goal was to construct it for $50.00. In PGB (pulse, GSR, breath) mode, the microcontroller waits for a signal from a concurrent MATLAB program (running on a laptop) indicating a data request. The data is sent to the laptop over an RS-232 link via a serial to USB adapter and it is plotted in real time. The MATLAB program performs the signal processing, such as computing pulse and breathing rates as well as skin resistance. In audio sampling mode, once a set of 32 sequential samples is acquired, the microcontoller performs a 32 point DCT on the audio signal to extract the frequency decomposition of the subject’s voice. At 8khz, 32 samples cover 4ms of speech and are enough to capture the primary features of human speech. The signal power is computed and the average DCT is updated with the new data. A concurrent MATLAB program periodically polls the microcontroller for the current DCT coefficients. These values are then plotted in a time-based heatmap, along with the signal power and average DCT. “ |
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May 23rd, 2008
Hello guys I’ve designed Plethysmograph using LM358 but i’d like to know more abt your circuit so that i can learn more from you guys. so plz help me out. cheers.
August 24th, 2008
[...] Polygraph (hacked-gadgets) [...]
December 30th, 2008
Hi friends………
i had been trying to execute ur MATLAB as well as C pgms for testing….buts its showing error….would u tell me which compiler u used for c pgming & which matlab version……
December 30th, 2008
Hi Surya,
You may have to click on the link to get more details since I am not sure that the creator of the device is monitoring this comment thread.
February 25th, 2009
i want to buy this one pleases contact me phone 00971509898353
March 1st, 2009
This is a DIY project so you would need to make your own.
March 29th, 2009
[...] Polygraph (hacked-gadgets) [...]
September 8th, 2009
i want to know that which simulator you used in your project
April 10th, 2010
I built a GSR meter with interface in a ‘gaming’ sort of framing, as a project in a beginners programming course. It’s way less sophisticated but alright as a proof of concept and for learning!
http://gsr-monkey.blogspot.com
April 11th, 2010
[...] Via: Hacked Gadgets Comments [...]
November 30th, 2010
Hi Alan
Can you send how to connect the circuits plograph
(or Simulation all circuits) with each other, and this controller to my mail(w.basheer@yahoo.com).
Thanks,
November 30th, 2010
Hi Wasim,
It was just featured here. Please click on the link in the article for additional information.