Bidirectional Visitor Counter using IR sensors and Arduino

code:-



#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);



const int Sensora = 2;

const int sensorB = 3;

const int output = 13;

int count = 0;



boolean sensorATriggered = false;

unsigned long sensorATime;

byte currStateA;

byte prevStateA = HIGH;



boolean sensorBTriggered  = false;

unsigned long sensorBTime;

byte currStateB ;

byte prevStateB = HIGH;



void setup () {

lcd.begin();

lcd.backlight();

Serial.begin (9600);

pinMode (Sensora, INPUT);

pinMode (sensorB, INPUT);

pinMode (output, OUTPUT);

lcd.print(" No of visitors ");

}



void loop () {

  lcd.setCursor(8,1);

currStateA = digitalRead (Sensora);



 if (currStateA != prevStateA)

 {

       if (currStateA == LOW)

       {

       sensorATriggered = true;

       sensorATime = millis ();

       }

 }

// prevStateA = currStateA;



 currStateB = digitalRead (sensorB);

 if (currStateB != prevStateB)

 {

 if (currStateB == LOW)

 {

 sensorBTriggered = true;

 sensorBTime = millis ();

 }

 }

// prevStateB = currStateB;



 if (sensorBTriggered && sensorATriggered)

{

 if (sensorATime> sensorBTime)

 {

 count ++;

 Serial.println(count);

 delay(500);

 }

 if (sensorBTime> sensorATime)

 {

 count--;

 Serial.println(count);

  delay(500);

 }

 sensorATriggered = false;

 sensorBTriggered  = false;

}

lcd.print(count);

lcd.print(" ");

}