updates on progress here, next problem is powering the roomba because i don't have a suitable battery 

here are ideas i would like to implement in order of importance:

Mode 1 "stationary" - being it must cool the drinks, monitor temp and open the lid when a hand waves over it. This should require no human interaction at all besides the hand wave trigger.

Mode 2 "stand and deliver" - Robot must remove itself from the base and follow a prescript to a point in the room where it will await for a few seconds for someone to wave their hand triggering the lid to open. once the drinks are retrieved the lid closes and robot returns to a spot in front of the base and triggers roombas docking feature to reconnect

mode 3"come to me" voice command trigger and robot follows heat PIR sensor and stops when it is close enough. when done it stays in place unless is it is told " Go Home" and then roomba home docking is activated

Mode 4 "beer butler" to be determined but i have heard of other drink serving robots that can roam around and serve a party, though it sounds cool this is clearly going to be the least used feature