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With this code, which works stably and without errors, you can see the number of products on the LCD screen. All errors in other codes have been cleared. This code is used in product counts of professional industrial machines.

You can use infrared or laser reader instead of ultrasonic distance sensor.
You can run the project from the Tinkercad virtual application sample and experience the system.

#include <LiquidCrystal.h>

//initialize the pins
const int trigPin = 6;
const int echoPin = 7;
const int buzzer = 8;
const int role1 = 9;


int count = 0;
int count2 = 0;
int urunaktif = 0;

//initialize the variables
long duration;
int distance;

//interfacing the LCD display
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup()
{
 //setup code to run once:
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(role1, OUTPUT);
  
  lcd.begin(16,2);
  lcd.clear();
  Serial.begin(9600);
  
  lcd.print("HELLO");
  lcd.setCursor(0,1);
  lcd.print("NICEDAY");
  delay(2000);
    lcd.clear();
}

void loop()
{

 
  
  digitalWrite(trigPin,HIGH);
  //delayMicroseconds(1000);
  digitalWrite(trigPin,LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2)/29.1;
  //delay(500);
  
  //suppose I have fixed the ultrasonic senser at the distance of 100 cm
  if (distance <80)
  {
    
    
    
    if (urunaktif ==0) ///////
      
    {  
    tone(buzzer,1600);
    
    
    count++;
    count2++;
    urunaktif++;
     // delay(1000);
    
    
    } /////////////
     
  
  }
  else 
  {
    noTone(buzzer);
    urunaktif =0;
    
  }
  
  
   if (count2 ==12)
    {
   digitalWrite(role1, HIGH);
   count2 =0;
     lcd.clear();

    }
  
  
  
  
  

  
  
  //lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("DISTANCE: ");
  lcd.print(distance);
  lcd.print("cm");
  lcd.setCursor(0,1);
  lcd.print("PIECE ");
  lcd.print(count);
  lcd.print(" / ");
  lcd.print(count2);
  //delay(500);

  
  
}

Tinkercad :

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