Cat feeder project

Hello Im not writing English well, i know i do lots mistaks :).
Im new in using Arduino, i Will make smart feeder for my Grandmather cat. It was based for this instruction , Arduino - Control DC Motor Via Bluetooth : 4 Steps (with Pictures) - Instructables
i read it. I have samo questions?
-Can i control dc motor angle?
-Is some iPad app to control this project?
If you have some instruction of project " smart cat feeder" please send my link to it.
Thanks a lot.

Can i control dc motor angle?

Not unless you add some sort of rotary encoder to the motor to give position information. It would be easier to use a servo which can be positioned to a precise angle

Is some iPad app to control this project?

You could control the Arduino using Bluetooth and an app on the iPad

Googled for Arduino animal feeder? Such topics pop up almost every week.