Bus Project New Code #2

// IR Obstacle Collision Detection Module - Henry's Bench
// Bus People Counter - Dawaerstore.com
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x3F, 20, 4);

int buzzerPin = 9;
int isObstaclePin = 2;
int isObstaclePin3 = 5;

int isObstacle = HIGH;
int isObstacle3 = HIGH;

int a = 0;
int b = 0;
int c = 0;
int d = 0;
int count = 0;

void setup() {

  pinMode(isObstaclePin, INPUT);
  pinMode(isObstaclePin3, INPUT);
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, 1);
  Serial.begin(9600);
  Wire.begin();
  lcd.begin();
  lcd.home();
  lcd.setCursor(0, 0);
  lcd.print(" Scanning...    ");

}

void loop() {

  isObstacle = digitalRead(isObstaclePin);
  isObstacle3 = digitalRead(isObstaclePin3);

  if (isObstacle == HIGH && isObstacle3 == LOW && a == 0)
  {
    a = 1;
  }
  else if (isObstacle == LOW && isObstacle3 == HIGH && a == 1)
  {
    b = 1;
  }
  else if (isObstacle == LOW && isObstacle3 == HIGH && a == 0)
  {
    c = 1;
  }
  else if (isObstacle == HIGH && isObstacle3 == LOW && c == 1)
  {
    d = 1;
  }

  calc();


}


void calc() {
  if (b == 1) {
    lcd.setCursor(0, 0);
    lcd.print(" Count is:    ");
    count = count + 1;
    digitalWrite(buzzerPin, 1);
    a = 0;
    b = 0;
    c = 0;
    d = 0;
    Serial.println(count);
    lcd.setCursor(0, 1);
    lcd.print("                ");
    lcd.setCursor(1, 1);
    lcd.print(count);
    delay(700);
  }
  else if (d == 1) {
    lcd.setCursor(0, 0);
    lcd.print(" Count is:    ");
    if (count == 2) {
      digitalWrite(buzzerPin, 0);
    }
    else {
      digitalWrite(buzzerPin, 1);
    }
    count = count - 1;
    if (count < 0) {
      count = 0;
    }
    a = 0;
    b = 0;
    c = 0;
    d = 0;
    Serial.println(count);
    lcd.setCursor(0, 1);
    lcd.print("                ");
    lcd.setCursor(1, 1);
    lcd.print(count);
    delay(700);

  }
}