Arduino Code For Lcd Counter Display

#include <LiquidCrystal.h>  

 #define trigPin 2

 #define echoPin 4

 // initialize the library with the numbers of the interface pins

 LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

 int counter = 0;

 int currentState = 0;

 int previousState = 0;

 

 void setup() {

 pinMode(trigPin, OUTPUT);

 pinMode(echoPin, INPUT);

 lcd.begin(16, 2);

 lcd.setCursor(4, 0);

 lcd.print("counter");

 }

 

 void loop() {

 long duration, distance;

 digitalWrite(trigPin, LOW); 

 delayMicroseconds(2); 

 digitalWrite(trigPin, HIGH);

 delayMicroseconds(10); 

 digitalWrite(trigPin, LOW);

 duration = pulseIn(echoPin, HIGH);

 distance = (duration/2) / 29.1;

 if (distance <= 10){  

 currentState = 1;

 }

 else {

 currentState = 0;

 }

 delay(200);

 if(currentState != previousState){

 if(currentState == 1){

 counter = counter + 1;

 lcd.setCursor(4,1);

 lcd.print(counter);

    }

  }

 }