You could have rigged up something like this: https://www.servocity.com/html/s3102_micro_mg.html#.Uyu11fnaKHM https://www.servocity.com/html/s3102_micro_mg.html

You could have rigged up something like this: https://www.servocity.com/html/s3102_micro_mg.html#.Uyu11fnaKHM https://www.servocity.com/html/s3102_micro_mg.html#.Uyu11fna... to the PWM output of your Arduino. This would have moved the iPad around, the same way as the pan tilt head.