It's time to head back to college and that means lots of fun, parties, and EPIC TAILGATING! (Go Razorbacks!)
BUILD A ROBOTIC DRINK MIXER!
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!
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 waste...you 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 lazydrinker.com.