This is a challenge issued by friends and family. The goal here is to make a robot that can bring beverages from another area to wherever the people are , allow the person to get their drink , then leave. It does not need to be fully autonomous , even remote control is acceptable. It does not need to grab them from the fridge, preloaded beverages are acceptable. This is Ez Robot though, I believe we could do better than that! Well anyways to start the project off I am using a roomba base. I picked up a stainless steel trash can last night as a outside casing. I will show you the rest as we go
By jstarne1
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I am sorry, Josh. You worked so hard. Good Luck on another solution.
Here's a DC powered 10 Liter Chiller
You might be able to either take it apart and use the innards or just mount it on the Roomba.
Yup that's what I pulled the guts from , a 12v electric cooler from igloo , it's cool I will tear apart a perfectly good fridge and see what I can do lol.
Might be expensive but I wonder if one of those 12 vdc powered RV refrigerators might work ?
@robot doc , they sure would but as you pointed out the small 3 cu ft ones start at 500 and that's out of my budget (as if I ever have one lol) because the plan is to run the compressor only on home base 110 volts can easily be used on two separate pins on the dock. I could have the 110 v on a relay that only trips when the 12v pins close loop.
I picked up a small fridge on craig'slist a hour ago in great condition , but you know me , I tear something perfectly good apart to make it better. Cooling the beverage AND bringing it to me is definitely better! Here are pics of my 15 dollar find !
What's cool is the Kenmore fridge even has specs sheet taped on the back for the compressor , nice. It appears the compressor is about 8 inches wide. Given the current width is 12.5 inches it may be a tight fit due to the connections.
Alright time to test! I need to make sure the fridge works well or using the parts for the robot are pointless. First thing I noticed from visual inspection is there is no external radiator... Hmm maybe it's inside? Maybe it's small enough it doesn't need one. Anyways I'm running it for 20 minutes and one hour marks to measure temperature.
Here is the start mark
20 min mark temp
1 hour mark holy cow! 26 degrees ( the mercury began to move soon as I picked it up) this was measured from the farthest point at the bottom on the fridge. I'm now going to move it to the top which I bet is colder.
Checking the specs the wattage is 96 watts based on the back plate. It indicates 120v x .8 amps . Now I have 110 volts household current so we know the actual wattage being used is lower. Basically this uses 3/4 the power of one of the 12710 Peltiers. This means the setup is far more effective but there will be a slight weight tradeoff. I'm sure the compressor weights more than the Peltiers and heatsinks.