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Video: Arduino & Raspberry Pi Drink-Mixing Robot

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Elizabeth M
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Cool party favor
Elizabeth M   1/30/2014 7:19:09 AM
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Wow, Cabe, I am impressed! I didn't realize you were such a talented inventor. This is quite cool and could certainky have commercial value, no?

Charles Murray
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Re: Cool party favor
Charles Murray   1/30/2014 6:37:48 PM
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Very cool, Cabe. This is a first. In my years on Design News (which is a lot), it's the first time I've been aware of an editor writing about his or her own invention. Fun video, too.

Nancy Golden
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Platinum
Re: Cool party favor
Nancy Golden   1/30/2014 7:56:02 PM
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Charles, you should check out Cabe's Project Goldie

"It's simple, bottles are classy. Ask yourself, would James Bond get a drink from a glorified self-serve soda machine? I wanted to keep the liquors in their original bottles. I also wanted to see the liquid pour out and the bubbles rise." Can't argue with that logic - great job Cabe!

Cabe Atwell
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Re: Cool party favor
Cabe Atwell   1/31/2014 3:43:12 AM
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Thanks everyone! 

The Drinkmotizer was a fun project. I write, so why not write about it myself? Plus, I wanted to clear up the question of why I used the bottle like that...

Yes, do see Project Goldie. It shows my first attempt at animating my cartoons.

Another project I made was for Halloween last year, the Scary Door. Watch the video here.

I didn't write about them all though.. check out my New Year's Eve countdown timer and fireworks launcher.

 

Cabe

janetwillson213
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Iron
Re: Cool party favor
janetwillson213   4/15/2014 3:37:31 AM
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Thanks Cabe, I like your video and Project Goldie, it is so nice. But I can't find your cartoons. Can you please tell me where is this actually? You may also check here regarding this.

Elizabeth M
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Re: Cool party favor
Elizabeth M   2/3/2014 7:20:46 AM
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I was wondering about that, Chuck. I haven't been around Design News that long but I was also wondering if it was common for an editor to also be an inventor and write about his/her own work. I think it's really interesting and cool, but personally I can only write about engineering, not actually invent anything or do anything too technical! So this makes me extra impressed about what Cabe has done. But perhaps we should do more of this if there are equally inventive people on the writing staff.

Charles Murray
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Re: Cool party favor
Charles Murray   2/3/2014 6:26:54 PM
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We've had some pretty amazing people on the staff over the years, Liz. Jon Titus, who  retired from Design News only a few months ago, is actually credited with building one of the first PCs, the Mark-8 in 1974, which appeared on the cover of Radio Electronics (unfortunately not on the cover of Design News). It's now on display at the Smithsonian Intitution in Washington D.C., which gives an idea of its monumental significance. That said, I don't remember any of our staff editors writing an article in DN about their own invention. To my knowledge, Cabe is the first.

http://www.youtube.com/watch?v=RcgeWmh8ym8

Elizabeth M
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Re: Cool party favor
Elizabeth M   2/4/2014 4:40:06 AM
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Wow, impressive, Chuck! I feel humbled in the presence of such talented folks, coming more from a journalist/writer side of things than the engineering side. I do have a fascination with technology and innovation, though, so I suppose that helps. Even if I can't do it, I can at least admire it and write about it. I think if other staff members are developing cool things, they should speak up and write about it!

Rob Spiegel
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Nice machine
Rob Spiegel   1/30/2014 8:58:22 AM
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Good going, Cabe. I particuarly liked the video. Obviously, you saved the Long Island Ice Tea for after you finished the gadget. This would ahve been a good contribution to Gadgwt Freak.

NadineJ
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Platinum
Re: Nice machine
NadineJ   1/30/2014 3:20:38 PM
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The video is fun.  I've seen automated wine bars showing up at health clubs.  Seems like an unlikely place but people love it.

78RPM
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Re: Nice machine
78RPM   1/31/2014 3:50:52 PM
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I was impressed with the cross discipline skills involved.  My Dad was a tool and die maker and taught me some lathe and milling machine technique so I can appreciate the craft.  Then you added the Pi and Arduino skills.  Was that a Charlieplexer I saw at the top of the montague at 2:41?  What kind of valves were used?

NadineJ
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Re: Nice machine
NadineJ   1/31/2014 6:27:01 PM
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"impress the chicks?"

You shouldn't give alcohol to chickens...especially babies.

78RPM
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Platinum
Re: Nice machine
78RPM   2/1/2014 9:08:11 AM
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I stand duly corrected.

Rob Spiegel
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Re: Nice machine
Rob Spiegel   2/4/2014 11:36:19 AM
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Yeah, Nadine, I've seen automated coffee bars in live theater lobbies. Though I haven't seen it, apparently tablet-servers are showing up at restaurants.

William K.
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Platinum
An obvious reason that you didn't mention.
William K.   1/31/2014 9:46:01 AM
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Cabe, this is indeed a really neat creation and it is especially good to see that an editor is experienced in the same realm that he is writing about. That gives you a 40DB jump in credibility. Good job on a neat machine.

As for why you chose to use individual bottles insted of a manifold, it is clear that your choice is a lot simpler to keep clean, which is important in food and beverage handling equipment. And it undoubtedly reduces waste as well, which reduces the cost of ownership. Two very good reasons for your choice.

Now here is a suggestion for improving the servo-system performance, which is to add another motor, such as a brush-type DC motor, to provide a bit of torque assist during the moves. Not enough to be the prime mover, but just enough to assure that the stepper would not be slipping steps. The drive voltage could be derived from the stepper speed command, scaled so as to avoid slipping steps. I realize that it is a "way outside the box" suggestion, but those ideas have resulted in some impressive successes over the years. 

But you might need to anchor the glass in the carrier more securely.

78RPM
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Platinum
Re: An obvious reason that you didn't mention.
78RPM   2/1/2014 10:43:53 AM
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Excellent comments, William K. Cabe does walk the walk and talk the talk of a design engineer.

Building on your idea of torque assist for the servo: Adding a brush-type DC motor would make the State Machine more complex and would likely require multitasking to control two types of motors and monitor position, suggesting an RTOS.  Thus, the Raspberry Pi would take on this burden, not the Arduino.  What do you think about providing torque assist via a latch solenoid engaging a twist spring just before activating a servo?  There could be one spring for forward assist and another for reverse assist.  The torque would be just enough to supplement the servo's effort. This might be a simpler approach, though I haven't thought through how to rewind the spring.

William K.
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Platinum
Re: An obvious reason that you didn't mention.
William K.   2/1/2014 3:46:40 PM
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78R, You propose an interesting alternative. But the problem of stepper motors slipping steps happens much more at higher speeds, rather than at starts, as long as the load is within the ability of the motor. So the control could be quite simple, just to add the additional torque whenever the velocity command exceeded some value. No need for a high level of control there. And another option would be to raise the stepper motor voltage when the speed command went above some setpoint. That would be a lot simppler mechanically and probably only require adding either a single relay or a switching transistor. And the voltage controller could be driven by the velocity command amplitude, so there would be no extra computer control functions involved. That is about as simple as I can think of.

taimoortariq
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Gold
Drinkmotizer
taimoortariq   1/31/2014 3:36:51 PM
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Nice Work Cabe, the project video was certainly refreshing to watch. I really liked the concept of the whole project. Simple yet quite useful. You can certainly add a commercial value to it, as pointed by Elizabeth.

a.saji
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Silver
Re: Drinkmotizer
a.saji   1/31/2014 9:29:18 PM
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 @taimoor: Yes something new and refreshing thing for the market.

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