php construct error

i have core php connect.php file like below,

<?php
// Enable us to use Headers
ob_start();

// Set sessions
if(!isset($_SESSION)) {
    session_start();
}
// header("Access-Control-Allow-Origin: *");
// header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "sample";
date_default_timezone_set('Asia/Kolkata');

try {
    $conn = new \PDO('mysql:dbname=ltc;host=localhost;port=3306', $username, $password);
    // set the PDO error mode to exception
	$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

} catch (\PDOException $Exception) {
    echo $Exception->getMessage();
    die;
}

?>

And now i have a file like below,

<?php
include '../includes/connect.php';
class DBController {

	private $db;
	
    function __construct($conn) {
        $this->db = $conn;
	}	


    function runBaseQuery($query)
    {
        $result = $this->db->query($query);
        while ($row = $this->db->fetch(PDO::FETCH_ASSOC)) {
            $resultset[] = $row;
        }
        if (!empty($resultset))
            return $resultset;
    }

    function runQuery($query, $param_type, $param_value_array) {

        $sql = $this->db->prepare($query);
        $this->db->execute($sql, $param_type, $param_value_array);
        $result = $this->db->fetchAll(PDO::FETCH_ASSOC);

        if ($result->num_rows > 0) {
            while ($row = $this->db->fetchAll(PDO::FETCH_ASSOC)) {
                $resultset[] = $row;
            }
        }
        if(!empty($resultset)) {
            return $resultset;
        }
    }

But above code giving me below errror,

Fatal error: Uncaught ArgumentCountError: Too few arguments to function DBController::__construct(), 0 passed in login.php on line 6 and exactly 1 expected in DBController.php:11 Stack trace: #0 login.php(6): DBController->__construct() #1 {main} thrown in DBController.php on line 11

How to use connect.php $conn variable in class file? please help me. Thank you.