AirPlay Mirroring lets you send what’s on your Mac to a classroom projector wirelessly with Apple TV.
These new Apple TVs (4th Generation HD) are configured differently.
There is no need for the remote.
Follow the directions below to connect your device.
Go to HDMI on projector remote to access Apple TV
See the "AirPlay" display screen - double-check that "Choose This Apple TV" name matches your classroom.
Enter code from screen into computer or iPad
By default, your Apple TV will "mirror" what is on your MacBook.
Put a check mark next to "Use as separate display" to "extend" your desktop as a second screen
Click the blue icon to disconnect from Apple TV