Project Ballo

hi all,

i have idea arduino project but, im struggling find arduino think small enough.

our cat has house cat next few months iv been looking @ toys , other stuff keep occupied, when came across sphero which, idea of , im pretty sure recreate similar device using arduino mini. sphero can controlled via bluetooth via app, i`m not bothered (thankgod) having radio controlled vehicle nice.

the main things want 2 dc motors drive ball

accelerometer might not needed but, nice.

bluetooth communications.

also id run off rechargeable battery lithium ion

i have found this seems need want sure before go off , buy everything, plastic ball want use 3" in diameter need fit inside motors , whichever shields need run it.

i`v been messing around raspberry pi's few years first venture arduino land i`d love hear advice or guidance

not sure how move thing, motors big power draw.

if od 3 inches, useable space less.
for dc motor, need mosfet , pulse that. 
there lots of fingernal size 'duinos     adafruit trinket  or digispark come mind
the project seems dooable.

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