Problem with the DS18B20 temperature sensor (NUCLEO-F401RE board )

You literally just insert it in-line and it'll overwrite the existing implementation:

var ow = new OneWire(A1);
var sensor = require("DS18B20").connect(ow);
sensor.getTemp = function(callback) {
  function read(me) {
    var s = me._r();
    var temp = s[0] + (s[1]<<8);
    if (temp & 32768) temp -= 65536;
    temp = temp / ((me.type==10)?2:16);
    if (callback) callback(temp);
    return temp;
  }
  this.bus.select(this.sCode);
  this.bus.write(0x44, true);
  if (!callback) return read(this);
  var tim = {9:94, 10:188, 11:375, 12:750};
  setTimeout(read, tim[this.getRes()], this);
};
setInterval(function() {
  sensor.getTemp(function (temp) {
    console.log("Temp is "+temp+"°C"); 
  });
}, 1000);