Drink Cooling Coaster




Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Gather Your Materials


Arduino Uno

(2x) 6"x 6" 1/4" Aluminum Plates

Several Peltier Therm o-electric Cooling Modules.

(4x) 2" long 3/8" hex head bolts

(4x) 3/8" nuts

(4x) 3/8" lock washers

1k resistor

SRD 05VDC SL C relay switch

12 volt power source for the peitier modules

power source for the arduino uno


4 prong button


Soldering Iron

Lead Solder

Needle Nose Pliers

Wire Strippers

Solid Gauge Wire



Antibiotic Ointment


Step 2: Test Your Thermoelectric Peltier Modules

Make sure to purchase several peltier modules because there is a chance 1 or 2 of them will not work. The red wire is your positive wire, and the black one is your ground wire. I think I ended up ordering about 10 of the peltier modules because it was such a good deal through Amazon.

Step 3: Measure and Drill Your Aluminum Plates

Measure and mark your aluminum plates with a sharpie in order to get them ready for drill press. Even though aluminum is a very soft metal, make sure you use some kind of oil lubricant to keep your drill bit from overheating or even messing up the size of your holes. For convenience I would put one plate on top of the other and drill through both plates simultaneously to ensure that your holes line up.

Step 4: Wiring Your Breadboard

When wiring up my bread board I ended up using a simple arduino program from the program library called Debounce that turned the relay on and off when I pressed the button. Starting with the button I ran the power wire (yellow wire) from the 5 volt port on the arduino to the left prong on the button. The black wire (your ground wire) should run from the ground port just underneath the 5 volt port over to the ground rail of your breadboard. The right prong of your button. You should have your 1k resistor going from the right prong of your button to the ground rail of your breadboard. Run a wire from port 4 to the left prong of your relay. The middle prong should have the positive wire of your peltier module soldered to it and the prong next to it,( the right prong) should run back to your ground rail and connect to the other side of your 1k resistor.

Step 5: Assembling Your Coaster

When you get ready to assemble your coaster, make sure you face the cold side of your peltier module to the top of the coaster other wise you will just end up with a hot plate. When you tighten the bolts, make sure you dont tighten them too tightly. Just make them snug.

Step 6: Please Use Safety

It is so easy, to take safety for granted. It it only take a second for an accident to happen. So please be extremely careful with your soldering iron.

Be the First to Share


    • Instrument Contest

      Instrument Contest
    • Make it Glow Contest

      Make it Glow Contest
    • STEM Contest

      STEM Contest

    10 Discussions


    2 years ago

    I do highly recomment to put thermal paste on each site of the Peltier Elements.

    I have this done too and I wonder how it could be with Water cooling (maybe to your PC)

    NASA Chris

    3 years ago

    How are you handling condensation buildup, both at the Peltier unit and the coaster as a whole?


    4 years ago

    Go Noles!


    4 years ago

    I made something similar using a pc's PSU to power the peltier then i had a cpu fan under the peltier to cool it(it was attached to a cpu steel heatsink) then on top i had a small tray with 2 inches of water and inside was the glass. In a hot day it was keeping my coffee relativly cold.


    4 years ago

    From a cost of usage perspective, peltiers are so inefficient that you better off just keeping your drink in the fridge. :)

    2 replies

    Reply 4 years ago

    the project used here only uses a relay.. if a arduino code is written to turn the module on and off depending on the temperature and using a heat sink with fan for the hot side the efficiency would be higher


    Reply 4 years ago

    I'm not sure about that. On average they are only 15% efficient.

    You also need to consider that the more heat is dissipated (from pulling it from the cold side), the less efficient they get because it needs to dissipate the heat being pulled from the code side plus its own heat from current going through it (it is resistive after all).

    If you cool it's hot side with a fan, the more heat it will pull from the cold side, which leads the element itself to use more current.


    4 years ago

    or you could use a DPDT relay,to reverse polarity on your TEC go from heat to cool without flipping so you can embed it into your desk/console/coffee table/Etc....etc.. et


    4 years ago

    a better heat sink would make this work much better. The TEC is a heat pump, all the heat your taking from the cup is transferred to the other side. also the energy you were putting in is ending up as heat. therefore if you are removing 3 watts from the cup and the TEC's are using 10 watts, you are dumping 13 watts of energy onto the hot side. Another thing, the larger the temp difference from cold side too hot side the less efficient the TEC's are. just some helpfully thoughts for you! If you like how these work you should check out thermocouples!


    Cool idea. And you can flip over the Peltier element and make it a drink warmer too.