Beer Butler , Cans, Bottles Or On Tap With Built In Chiller

The PS2 cables are available at GoodWill on the keyboard or mouse for $1.99 each.

hello updates on progress here, next problem is powering the roomba because i don't have a suitable battery i need to wait till i can buy one on amazon. I am waiting on the peltiers which feel like they are taking forever to get here. i believe they will arrive by friday. I want the beer butler to be able to operate in at least two modes with minimal human interaction.

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

examples of roombas docking feature on my particular model

http://www.youtube.com/watch?v=77BrSbFdNQU

http://www.youtube.com/watch?v=qcBs-fj4ORY this is not my model but just here for reference

OK so what i learned with the auto dock is the roomba consistently lines up to a dock and then slows down to connect. it looks accurate with less than an inch play. That being said the pins on the roomba provide 17 volts at about 2 amps to charge the battery. This is too much voltage for the 12 volt peltier and far too little current (amps) , at max they can handle 15.4 volts so 17 is a little too high of a stretch. My idea is to place a second set of contacts about a inch away from the original ones and those two contacts can be the 12 volt source for the constant peltier cooling. I will probably post to ask a question to gather opinions but this appears to be the most practical way for the robot to connect itself to the 12 volt power for the peltiers in the chiller without human assistance.

Any suggestions are welcome , I'm just using open thought process to develop a solution.

I'm showing the contacts here. Any good ideas for adding pads? Seems like modding this caster and trimming the sides off might make room for two more contact plates.

Tiny update - I checked the tracking for my Peltier units the TEC- 12710 which draw 10 amps of current at 15 volts.

I took off the hot side heatsink and tested it agian! I read 12.04 volts and 2.8 amps. This is basically enough to cool a soft drink in a few minutes from room temp but it won't do a thing with a 12 pack of beer. The wattage of this Peltier I have calculated to be 34 watts so my assumption that it was a 40 watt Peltier is probably correct. Here are pics during the test...