It’s possible to connect up to 12 small servos (those you find in model air planes etc), to a standard Arduino board, for controlling robots, toys, appliances etc (combining this with the previous IR remote project comes to mind).
To be able to power so many servos a separate power supply would be needed. I haven’t added that yet, but the photos show how simple it is to make the servo control and power connections. I used the MegaServo library.
And the obligatory video (not very exciting):