Is it possible to polygraph with the Arduino?First, let's talk about how the polygraph works work Mantgum. When you tell people lie deep in the electrical conductivity varies depending on the excitement. We will form the basis of our machine utilizing the conductivity changes in the skin. Galvanic Skin Response from medical sensors for this (GSR) will use the measurement sensor.

More information: http://www.robimek.com/arduino-ile-yalan-makinesi-yapimi/

Step 1: Materials:

Arduino
Galvanic Skin Response (GSR)Measurement Sensor
buzzer

Step 2: Electronic Circuit Connections

The sensor supply voltage: 3.3V – 5V
The sensor signal pin: Analog 1 pin
GND: GND pins to
Buzzer plus 4. Digital Pune
Buzzer gnd: Gnd

Step 3: Software Part:

const int buzzer_pin=4; //Buzzer pin

const int gsr_sensor=A1; // sensör sinyal pini

int ortalama_deger=0; // ortalama değeri

int sensor_degeri; // sensör değeri

void setup(){

long toplam=0;

Serial.begin(9600);

pinMode(buzzer_pin,OUTPUT);

digitalWrite(buzzer_pin,LOW);

delay(1000);

for(int i=0;i<500;i++)

{

sensor_degeri=analogRead(gsr_sensor);

toplam += sensor_degeri; delay(5);

}

ortalama_deger = toplam/500;

Serial.print("ortalama_deger =");

Serial.println(ortalama_deger);

}

void loop()

{

int temp;

sensor_degeri=analogRead(gsr_sensor);

Serial.print("sensor_degeri=");

Serial.println(sensor_degeri);

temp = ortalama_deger - sensor_degeri;

if(abs(temp)>50)

{

sensor_degeri=analogRead(gsr_sensor);

temp = ortalama_deger - sensor_degeri;

if(abs(temp)>50)

{

digitalWrite(buzzer_pin,HIGH);

delay(3000);

digitalWrite(buzzer_pin,LOW);

delay(1000);

}

Step 4: Description

The sensitivity of the sensor can be adjusted.These values will vary from person to person based on the person’s reference to the measured value in the event of a quiet excitement, hunger, fear as compared with the situation in these values can understand the status of the person accordingly.This difference will give buzzer alarm is activated when greater than 50 and people will be understood that lying is a difference between value and values of residents in a lie.

The following excel calm person, hunger, excitement shown changes in circumstances.

More information: http://make.robimek.com/polygraph-made-with-arduino/