Introduction: Robotic Drink Mixer

Picture of Robotic Drink Mixer
It's time to head back to college and that means lots of fun, parties, and EPIC TAILGATING!  (Go Razorbacks!)


This is a portable system that can mix over 5,000 drinks on demand from a laptop computer.  Build it and they will come!

Here is what the Robotic Drink Mixer is capable of:

Some of you may have seen my other instructable last year, BaR2D2, the mobile bar.  This is the long awaited drink mixer upgrade!  If you want to see the robot this can attach to, go here:

This system was built to replace the manual liquor carousel.  It has been an incredible upgrade and we have had a blast with it!

You can friend BaR2D2 on facebook:   bartwo dtwo

Step 1: Time to Order Parts!

Picture of Time to Order Parts!

The Robotic Drink Mixer uses a compressed air system to force liquids out of the ingredient bottles (air is forced into the bottles and a syphon tube allows the liquid to come out.  An electronic valve (solenoid valve) controls how much liquid comes out and when.

For my setup, I am using six ingredient bottles and six solenoid valves.  The bottles are about a liter each and have a standard neck thread like a plastic coke bottle (you can actually use plastic coke bottles).

The valves are 12 volt plunger-style solenoid valves (normally closed).  These were obtained at McMasterCarr for about $25 each.  I used part number #7877K313.  The air tanks are from ebay and were originally used in semi truck air horns.  You can use any air supply tank as long as it has enough volume to fully displace all the contents in your ingredient bottles.

I charge these tanks to about 75 psi and then using a regulator, reduce the pressure to 5 psi at the ingredient bottles. (any more than this is a get good flow at 5 psi and reduce air leaks).  Use a Schrader valve in your tank and then you can fill it using a regular air compressor or foot pump.  Use clear Tygon PVC tubing to connect everything on the low pressure side.  On the high pressure side, use pvc air line.

The regulator was purchased through SurplusCenter on the net for about $20.  I also got the gauges from there.  Again, you are basically just trying to get to about 5 psi at the bottles.

To make connections easier, I used acetal push-to-connect fittings. (McMaster Carr part #51055K14)  These thread into the valves and the Tygon tubing plugs into the fitting.  Size your tubing to match each connection.

To distribute the six air lines into the ingredient bottles, we used an aluminum manifold (McMasterCarr part #5469K151)  Thread your push to connect fittings into this as well.  The tops of the bottles that have the two air nipples were purchased through

Step 2: Make Templates for Structure

Picture of Make Templates for Structure

The parts for the drink mixer are made from 1/8" aluminum plate.  Mine were cutout using the waterjet process.  This machine uses a high pressure water stream with an abrasive compound to cut the parts.  I used the services offered by to cut my parts.  You simply upload a file to their site and they mail you parts.

Other materials (plastics, wood) can also be used.  If you don't want to go to the expense of waterjetting, you can use a jig saw or band saw to make your parts.

My templates were made to accomodate 6 plastic bottles that are about a liter each.  Your bottles may be different, so make your parts according to how many bottles/size of them.

You can see my finished template for the base, bottle support, and bottle holders.  Also there is the valve support and the compressed air tank supports.

Step 3: Assembly Time!

Picture of Assembly Time!

The parts are assembled with 4 threaded rods and nuts (I used 5/16").  These allow you to slide the parts on and adjust them all for proper clearances on everything.

I made a plate that holds the six valves.  Drill and screw the valves to the plate.

Cut the threaded rods to 4 equal lengths (length depending on your bottles and height of desired machine).  Also,  cut six threaded pieces to use to hold the upper supports together.

For the base of the portable system, I used an oval shaped plaque I purchased from Michael's craft store.  This was sprayed with black texture paint.  The base provides a stable base.

I attached the manifold, regulator, and valves to the base plate.  Your install may be different.

Plumb up all your airlines.

Step 4: Electrical Connections

Picture of Electrical Connections

Now that we have built the structure and mechanical bits, it's time to wire it up.  The brain of the robotic bartender is the Lazydrinker circuitboard. (  This board connects to a laptop via a serial cable.  The software was also obtained from lazydrinker.

Create a wiring harness for the valves.  They use a common ground.  The positive is run to a serial cable pin.  The pin designations are given via lazydrinker.

I also added 12 volt led lighting to accent the bot and provide light when my robot is running around in the dark at a party.

As for powering your Robotic Drink Mixer, you need a 12 volt power supply.  If you look around your shop or computer parts bin, you may find one from an old modem, computer, etc.  Just needs to have at least 1 amp (I would go with 4 if you can find one).

For BaR2D2's mobile usage, a custom Bluetooth receiver board was built (credit Jay Lueck).  This attaches to the lazydrinker board and allows wireless usage from my Dell PDA.

Step 5: Time to Party!

Picture of Time to Party!
Now, fill up your ingredient bottles and pressurize the system.  You plug in your ingredients into the software and it generates a list of what you can make with them.  You are now in business!

A couple of usage notes - my system is designed for table top (or in my case also for mobile robot usage).  My items aren't refrigerated, but filled with cold ingredients, it will easily last all night.  If you want to use it again the next day, I would recommend putting the bottles in a cooler or refrigerator overnight.

Make sure to flush the system after each use or the valves will get clogged.  I recommend using bottle sanitizer used in home beer making.  Wash the bottles and flush the system and thoroughly dry everything so it will be good to go for your next party!

Have fun!....and of course the disclaimer:  drink responsibly, don't drink and drive, don't drink unless you are 21...blah, blah, blah.  Also, this is a pressurized system and MUST be treated with respect!  DO NOT build this system without a safety overpressure valve on your main tank!!! and do not fill them to more than the manufacturer's rated pressure.  Doing so creates an explosive situation!

You can see the full BaR2D2 robot in this video taken from a late night party in Atlanta a couple weekends back at Dragon*con.  It's always a blast to take it out!

Step 6:

Picture of


suboxygen (author)2015-03-07

I found the push connectors much cheaper on ebay.

like buck a piece for elbows. few bucks more for the regulator. they also sell tubing.. there are also the thread to push fitting pieces.. and if you search on ebay for air manifold... you can find an aluminum air manifold for like $8.

jayeshshinai (author)suboxygen2015-06-21

Are you making one? I would want to build it together.

boosey (author)2015-01-21

I cannot locate the bottles or especially the double nipple fitting. Is there anyone who has found them lately? Lazydrinker does not sell parts apparently.

przygoda (author)2013-03-08

What ingredients do you put in your bottles? I've almost finished building my robotic mixer and I have no idea what to put into the bottles to make as many drinks as possible

DayBowBow (author)2013-01-07

Did you buddy ever make the control board that replaces the lazy drinker?

tde1806 (author)2010-12-14

I have just contacted
and he wrote back.
that his not selling the lazydrinks board at this moment, so is there anyone who as another idea to make the robotic bartender.


gigsgtox (author)tde18062011-02-17

I've built a "semi-system" using the LED-Wiz.

I built basically this same thing but with an actual compressor and tank, knocked down to 6psi for 4 fluids. It takes a little more work on your part as there is no software, you have to create your own, but the basic premise is the same. I ended up bailing on the final construction because I couldnt get cola's to distribute properly.

mvangorden (author)gigsgtox2012-07-11

if you still have all those parts and software programmed for the LED WIZ I would be interested in taking those off your hands...

jamiep (author)tde18062010-12-16

Short answer, yes - my friend will be rolling out a new circuit board and software design soon that will be available. Stay tuned... probably first quarter of new year.

tde1806 (author)jamiep2010-12-16

Ok looking forward too

jamiep (author)tde18062010-12-16

On another note - check out my latest project that is in the Humana contest. If you think it's a winner, vote and rank it highly. Thanks!

jsp5048 (author)2011-10-03

Hey Jamie,

My classmate and I have decided to build an automated drink maker for our senior project (we're electromechanical engineering majors). I actually had no idea prior to this that such inventions were already made, but this is pretty awesome stuff. Just had a few questions I was wondering if you could answer:

-Roughly how much did this cost you in all? (we have a budget)

-How long did this project take you?

jamiep (author)jsp50482011-10-03

All in, there is probably $1,500 in parts and machining. If you were just building a table top non robot version, it would be much cheaper.


mali28 (author)2011-09-19

Do you build more for sale? and would you help a group of students to do one?

Thank you

Tekker (author)2010-10-20

Awsome write-up! I just couldn't find the types of dispensing bottles that you used, could you list the site/store where you found them? Thanks!

jamiep (author)Tekker2010-10-20

They are made by Silgan Plastics and are screw top 32 ounce bottles. Can't remember which website I got them from.


botronics (author)jamiep2011-09-05

I went to The email is not even taking any mail. They do not sell any products. I'm looking for those special cap assemblies. Emailed Silgan Plastics, will wait and see what response I get.

rschu3tt3 (author)2011-07-29

If there is another model in the works I suggest one that is all terrain. After seeing your model, I am busy drawing up one that I think would cover everything a guy would need. Nothing may come of it, but it sure is fun to think about. Great job on your's though.

Myty06 (author)2011-07-24

Was wondering if your friend had finished his design and build of his bar software/hardware.

gigsgtox (author)2011-02-17

I've got a similar build which has been ongoing for a while. My question is, do you have an easy way to dispense soda?

I've been running at 6psi, but soda re-pressurizes to much higher than that (35psi). Was wondering if you had a good solution? I'm thinking of putting a T fitting at the top and then having 2 separate operating pressures, one on the soda side at 40, and one for the standard liquids at 6.

jamiep (author)gigsgtox2011-02-18

I have a friend that is currently designing and building a bar software/hardware piece that I believe he is going to make available for sale once he unveils his project. Ask me again in early/mid summer. It looks like it will be most excellent user interface. jamie

Algag (author)jamiep2011-07-10

anything happen with your friend and that project by any chance?

jamiep (author)gigsgtox2011-02-18

As for soda, we aren't using bottle space for that at this time. we usually put mixers/liquors in those and put the soft drinks in the drawer... you could prob go with higher rated valves and use co2 to pressureize. jamie

KoolSkoolKid (author)2011-02-28

Lazydrinker isn't available to get the circuit board from. Is there another way to get it?

kelevra88 (author)2011-01-07

i am trying to achieve this build and was wondering if someone could give more detail on what way i can setup the air system ,what volume i need in the tanks,what rating i need for a compressor system and if this setup can be achieved in any similar fashion that will still work with the software setup and as cheaply as possible on ebay or something if someone can give me links to products suitable ,thank you all ,new member but i think this site is brilliant!!!

jamiep (author)kelevra882011-01-08

the air volume needs to be the volume of the ingredient bottles plus a buffer... shoot for 150% of the bottle volume or more.

as for the pressure, i have my regulator that knocks the tank pressure down to around 4psi at the bottles.

if you need the metal waterjet cut parts for the drink mixer, I have an extra set I would sell for $100.


cuschierimark (author)jamiep2011-02-07

Hi jamie are the water jet cut parts still available please as it would be brilliant for me to buy them from you.


jamiep (author)cuschierimark2011-02-18

yes - I have one set that was the prototype. send me an email jamieaprice at to discuss

captainharlow (author)2010-09-24

I checked out laytdrinker YEARS ago and they were not acccepting orders. I just checked again and they are still not accepting orders. Do you have an alternative supplier for this stuff?

gigsgtox (author)captainharlow2011-02-17

A similar product is the LED-Wiz. Its not intended for this, but functions the same w/ the same 500mA output.

sr5337 (author)2010-12-15

can you still get a beer too? or is the mixer now in the way?

jamiep (author)sr53372010-12-16

The base of the drink mixer is small enough so that the beer elevator still works.

laxplayer1199 (author)2010-11-27

Where did you get the Schrader valve? thanks!


jamiep (author)laxplayer11992010-12-07

I got it at mcmaster carr

sampson111 (author)2010-10-19

could u please put a easier to read materials list thank you

DarkRubyMoon (author)2010-10-03

OMG! A Robotic Drink MACHINE! THE BEST IDEA EVER! Now... if you can just give it some robotic wheels and get it to ride over to me... this could be the greatest invention since beer! I assume these are alcoholic drinks yes? Awesome!

jamiep (author)DarkRubyMoon2010-10-19

It's got wheels and drives around :) scroll to the last page where it shows the finished robot.

DarkRubyMoon (author)jamiep2010-10-19

No Way! I've got to get myself one of these! :D

kunku (author)2010-10-05

is there any other eqiupments that can be used in the place of wood plasic and aluminium

iconnu (author)2010-10-01

Are you also the guy who had the controllable light up suit @ Dragon*Con this year? If so, is there any chance of getting an instructable for that?

jamiep (author)iconnu2010-10-01

The guy with the light up suit is my friend Marc Devidts... you probably saw us together at one of the night parties. His contact info is:
I know he will be in an upcoming popular science article with the suit.

abyssnolf (author)2010-09-29

I've looked over everything three times, and it seems like there are three parts that might not have been mentioned in the description.

First, there are acetal push-to-connect elbow fittings - I know the straight push-to-connect fittings had a product number given, but is there one for the elbow fittings?

Then there are the 15 black elbow fittings that appear only in the first picture, but I don't see them in any of the others. Perhaps these were replaced by the fittings mentioned above?

Last, the valves have a small black elbow fitting that redirects the flow of liquid down. Is this any special component, or just an normal elbow fitting that fits into the valve?

Thanks for the awesome work and the great write-up! Truly an inspiration.

mvberg (author)2010-09-23

What size couplings did you use on the caps, 1/4"?

jamiep (author)mvberg2010-09-23

I believe the tubing was 1/4" OD and 3/16" ID TYGON

mvberg (author)jamiep2010-09-28

Thanks. How did you go about attaching them to the caps? Epoxy, gaskets?

Valiko (author)2010-09-24

Why do you use 2 tanks and what is the volume?

jamiep (author)Valiko2010-09-27

two tanks because of 1) volume, and 2), that's the size I could fit into my design. As for voume...these are typically used in car air horns...maybe 1/2 gallon?

burn317 (author)2010-09-23

You could upgrade the board so it has a wifi or bluetooth antenna and program it to communicate to a smartphone so you can control it wireless.

burwuro (author)burn3172010-09-26

as it says in the instructable, "For BaR2D2's mobile usage, a custom Bluetooth receiver board was built (credit Jay Lueck). This attaches to the lazydrinker board and allows wireless usage from my Dell PDA."
I bet you could use it in this aswell.

jamiep (author)burwuro2010-09-27

Yep - bot is now running using a pda with bluetooth.

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