Lie Detector

Lie Detector

Nedelcu Teodora-Johanne

Introducere

Prezentarea pe scurt a proiectului vostru: The lie detector uses a sensor that tells us the pulse of the person wearing it, therefore we are able to tell if they are lying or not.

Descriere generală

We start the measuring of the pulse and if its elevated the person lied. A message will appear on the display with the result.

Hardware Design

List of required Pieces:

Arduino Uno
Pulse Sensor
Display LCD 1602
Cables

Software Design

The code displays on LCD the amount of beats per minute calculated by the pulse sensor. I used the following libraries:

1. For the LCD display

     LiquidCrystal_I2C.h
     Wire.h

2. For the pulse sensor

     PulseSensorPlayground.h

Code:

#define USE_ARDUINO_INTERRUPTS true #include <PulseSensorPlayground.h> #include <LiquidCrystal_I2C.h> #include <Wire.h>

const int PulseWire = 0; int Threshold = 550;

LiquidCrystal_I2C lcd(0x27,16,2);

PulseSensorPlayground pulseSensor;

void setup() {

lcd.init();                    
Serial.begin(9600); 
pulseSensor.analogInput(PulseWire);   
pulseSensor.setThreshold(Threshold);   
  if (pulseSensor.begin()) {
Serial.println("We created a pulseSensor Object !"); 
}

}

void loop() {

int myBPM = pulseSensor.getBeatsPerMinute(); 
if (pulseSensor.sawStartOfBeat()) { 
  Serial.println("♥  A HeartBeat Happened ! ");
  lcd.backlight();
  lcd.setCursor(0, 0);
lcd.print("BPM");
lcd.setCursor(0, 1);
if (myBPM < 100){
  lcd.print(" ");
  lcd.print(myBPM);
  lcd.setCursor(4,1);
  lcd.print("   ");
}else{
  lcd.print(myBPM);
  lcd.setCursor(4,1);
  lcd.print("Lie");
  
}
Serial.println(myBPM);
  }
delay(20);

}