php - mysql_connect(): Access denied for user 'root'

Guys i'm having common issue.
I want to display data from MySQL database into HTML page using PHP.

Using this code:

$servername = 'localhost'; 
$username = 'root';  

$password = '';

// Connect to database server
mysql_connect('192.168.1.106','root','','database') or die (mysql_error ());

// Select database
mysql_select_db('database') or die(mysql_error());

// SQL query
$strSQL = "SELECT * FROM pulsesensor";


// Execute the query (the recordset $rs contains the result)
$rs = mysql_query($strSQL);

// Loop the recordset $rs
while($row = mysql_fetch_array($rs)) {

   // Write the value of the column id and value
  echo $row['id'] . " " . $row['value'] . "
";


  }

// Close the database connection
mysql_close();
?>

but i got

mysql_connect(): Access denied for user 'root'@'XXX' (using password: NO) in C:\xampp\htdocs\html.php on line 16
Access denied for user 'root'@'Dell' (using password: NO)

i changed the password the same error appear

mysql_connect(): Access denied for user 'root'@'XXX' (using password: YES) in C:\xampp\htdocs\html.php on line 16
Access denied for user 'root'@'Dell' (using password: YES)

i don't know what to do