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Arduino Based Lie Detector


Hey everyone today I want to show you how to make an Arduino-controlled lie detector to see when your friends are lying to you or to measure the different responses that your bodies skin goes through depending on the situation you are in or the emotions you are feeling and the coolest thing of all is that we can see all of theses things happen in real time in an Arduino graph.


Our skin is amazing! It provides a medium for us to experience the sense of touch, it keeps infections out and keeps innards in but I bet you didn't know that our skin changes conductivity depending on many different things one being our mood! It called Electrodermal activity (EDA) and there's a really interesting Wikipedia page you can read here. The basics are that our skin changes its conductivity depending on how we feel.

We have to start by asking the subject some easy questions we know they will answer truthfully like "what is your name" and "where do you live" to get a baseline and from there we can start asking questions that they may lie about, if they do they would probably feel nervous and then we can read the change in the base line that be established earlier if they lie.



Step 1: What You Need?

1 x Arduino Nano
1 x Mini USB Cable
1 x Red LED
1 x Green LED
1 x Orange LED or Yellow LED
1 x 2k Ohm Resistor
Wires


Materials 
- Cardboard
- Tinfoil 
- Velcro 

Tools 
- Soldering Iron & Solder
- Hot Glue 
- Craft Knife 


Don't have components? Don't worry. Just click the component's name. 


Step 2: Build Your Circuit. 

The wiring for this is pretty easy, we will start by connecting them in this order:

  • Connect a long piece of cable to Arduino analog pin 0.
  • Connect the 2k resistor to ground and the the extended analog 0 pin.
  • Connect a long piece of cable to Arduino 5 volt pin.
  • Connect the anode (long leg) of the green led to pin 2 and the cathode (short leg) to ground.
  • Connect the anode of the orange led to pin 3 and the cathode to ground.
  • Connect the anode of the red led to pin 4 and the cathode to ground.

That's all the wiring for the Arduino, now we need a way to keep the sensor wires on our fingers we will cover this later.


Step 3: Upload The Code. 



The main piece of software we are going use is the newest version on the Arduino IDE. The new update brings a new way to see the data being received from the Arduino, instead of being in text form from the serial monitor, it can now be displayed in a real time graph which will help us identify when the data changes its pattern (when someone lies)



To open the plotter open Arduino and navigate to the tools menu and you should see it there just below serial monitor.


Step 4: Making The Finger Clips.


Now that the basic form of the project is done we can start adding features to make it easier to use we will start by adding finger clips to keep a stable connection between our fingers and the cables. 




Lets start by gluing a strip of tinfoil to the bottom of a strip of velcro, do this for both pieces of velcro (the hook and the loop. Now rap it around your finger until it makes a tight fit (check photos) then tape the exposed wire from analog pin 0 to the tin foil and repeat this step for the 5 volt pin (make sure it makes a good connection).




Step 5: Making The Case.


The plan is to make a small compartment for the finger pads to fold away and to have three holes for the LEDs to stick out. Its going to be made out of cardboard and to make it we will need to cut the following shapes out:
  • Cut two 15x3 cm rectangles
  • One 15x5 cm rectangle
  • Three 5x3 cm rectangles (cut a square in the middle on one of them for the nano usb)
  • One 9x5 cm rectangle
  • One 6x5 cm rectangle



The 15x5 rectangle is the base. The two 15x3 rectangles and two of the 5x3 rectangles get glued to the sides of the base. Now glue the third 5x3 rectangle to the base 6cm from the side (close to the middle, check photos) Now you should have a rectangle that's divided into two sides, one with a length of 6cm and the other with a length of 9cm. The side with a length of 6cm is where we are going to put the electronics and the other side is where the finger pads go. Next cut 3 holes (the size of LEDs) on the 6x5 rectangle and glue it down to the 6cm side (as a lid). Last we need to tape the short side of the 9x5 rectangle to the far side of the 9cm side (this acts as a lid that flips up and down to reveal the finger pads).





Step 6: Putting It All Together.


The last thing we need to do is put the electronics in the case start by gluing down the Arduino and all wires in the 6cm side and run the extended wires (pin analog 0 and 5 volt) to the other side of of the rectangle (9cm side). Now glue the three LEDs to the holes we made on the 6x5cm rectangle and give it a test if all goes well you should have a small portable Arduino lie detector but let me warn you this isn't the most accurate system in fact most real lie detectors use a host of other sensors to determine if someone is lying such as a heart rate monitor and others, what I'm saying is don't uses the result of this for serious questions.





http://news.chivindo.com/667/arduino-based-lie-detector.html

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