i have this idea for a butler bot. inspired by Norrislabs (BDS) beverage delivery system http://norrislabs.com/. it will have 1 propeller board it will handle motion, the sensors and a slave for bat lvl temp snsor and controlling the peltier units. it wil have 2 window up/down motors with a h-bridge for each. it will be powered by 2 12v bats for the motion and a 7.2 bat for the prop boards and speakers. the whole thing should be about 4 ft tall.the fridge should hold 3 sodas depending on the size.