I hooked up today my iPad Mini to my Alphasmrt, using the Lightning USB Camera Adapter, and an unpowered USB hub (as described on other sites on the Internet). iOS protested that the adapter did not have enough power (and that it was an incompatible device).
But, you know what, it worked anyway. I could use the Alphasmart as a keyboard, and I could send files to the iPad mini in the same way as I can send them to other computers.
There was one glitch. Connecting up the Alphasmart installed and used an Arabic Keyboard. I had to manually reset it to English.