How to Make Object Detector

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Code :-

/* code started

code created by Technical idEas

 #define buzzer=11

 #define led=12

#define trigPin = 10;

#define ehoPin = 9;

16x2 lcd connection

                 rs = 2, en = 3, d4 = 4, d5 = 5, d6 = 6, d7 = 7;

   channel link :- https://youtube.com/channel/UCCJyR_wnt3SxhErsSUP9Wrw

*/

#include <LiquidCrystal.h> 

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

const int trigPin = 10;

const int echoPin = 9;

long duration;

int distance;

void setup() { 

  pinMode(trigPin, OUTPUT); 

  pinMode(echoPin, INPUT);  

  pinMode(11, OUTPUT);

   pinMode(12, OUTPUT);

  Serial.begin(9600);  

  lcd.begin(16,2); 

  lcd.setCursor(0, 0); 

  lcd.print("  Technical idEas ");

delay(5000); 

}

void loop() {

    digitalWrite(trigPin, LOW);

 

    delayMicroseconds(2);

 

    digitalWrite(trigPin, HIGH);

 

    delayMicroseconds(10);

 

    digitalWrite(trigPin, LOW);

    duration = pulseIn(echoPin, HIGH);

    distance= duration*0.034/2;

    Serial.print(" OBJECT");

    Serial.println(distance);

    if(distance<20){  

    digitalWrite(11, HIGH); 

      digitalWrite(12, HIGH);

       lcd.begin(16,2);

       lcd.setCursor(0, 0); 

  lcd.print("      DETECTED");

   lcd.setCursor(0, 1);

  lcd.print(" OBJECT");

     delay(1000);}

    else

   {

  digitalWrite(11, LOW);

   digitalWrite(12, LOW);

   lcd.begin(16,2);

   lcd.setCursor(0, 1);

  lcd.print("NO OBJECT ");

    }                 

 

}