Welcome to Android Central! Unfortunately, the Droid Maxx does not support MHL or Slimport adapters (which is how you would otherwise be able to connect via cable to the projector). If the projector doesn't have the ability to connect directly to the phone via wi-fi or Bluetooth, then the only other option I can think of would be to use a Chromecast, assuming you're able to connect to a wi-fi network.