14 – Lie Detector

This project is from 30 Arduino Projects for the Evil Genius (2nd Ed) by Simon Monk and used with kind permission from McGraw-Hill.  Please see MonkMakes for more great books from Simon Monk

 

int redPin = 9;
int greenPin = 10;
int bluePin = 11;

int buzzerPin = 7;

int potPin = 1;
int sensorPin = 0;

long red = 0xFF0000;
long green = 0x00FF00;
long blue = 0x000080;

int band = 15;
// adjust for sensitivity

void setup()
{
pinMode(potPin, INPUT);
pinMode(sensorPin, INPUT);
pinMode(redPin, OUTPUT);
pinMode(greenPin, OUTPUT);
pinMode(bluePin, OUTPUT);
pinMode(buzzerPin, OUTPUT);
}
void loop()
{
int gsr = analogRead(sensorPin);
int pot = analogRead(potPin);
if (gsr > pot + band)
{
setColor(red);
beep();
}
else if (gsr < pot - band)
{
setColor(blue);
}
else
{
setColor(green);
}
}
void setColor(long rgb)
{
int red = rgb >> 16;
int green = (rgb >> 8) & 0xFF;
int blue = rgb & 0xFF;
analogWrite(redPin, red);
analogWrite(greenPin, green);
analogWrite(bluePin, blue);
}

void beep()
{
for (int i=0; i<1000; i++)
{
digitalWrite(buzzerPin, HIGH);
delayMicroseconds(100);
digitalWrite(buzzerPin, LOW);
delayMicroseconds(100);
}
}