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61
Robot Videos / Re: Stable quadcopter scratch build using arduino nano
« Last post by jaosef on August 14, 2014, 01:46:52 AM »
Did another flight, now in Uppsala, Sweden
https://www.youtube.com/watch?v=6GZpYjeUk4M
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Misc / Just saying Hi from SC
« Last post by Andakwa on August 13, 2014, 10:28:33 PM »
Hello everyone, I fiddle with micro-controllers & electronics and just finished my first robot. It is made with Arduino Uno, Seeed Motor Shield v2, Ping Ultrasonic Sensor, PIR Motion Sensor & a Bluetooth Slave module.
I got the basic idea from a website and used a few of the same parts but wrote my own code.
He roams aimlessly, pausing to see if my dogs are following the continues on or turns on them if they are stalking him and I can turn him into an RC car via bluetooth.

Nice to meet you all.


63
Mechanics and Construction / Re: 3D printing parts for fun!
« Last post by Billy on August 13, 2014, 05:31:41 PM »
If anyone is interested, shoot me a message. I can print with ABS, PLA, PETG and flexible filament.

That's cool you're willing to do this for people.
I made a 3D printer - printed two test pieces - and haven't touched it since.
Turns out that for me, building a 3D printer was the goal, not having one.
https://www.youtube.com/watch?v=SAGvzeQw2Oc
64
Mechanics and Construction / 3D printing parts for fun!
« Last post by Anoroc on August 13, 2014, 12:21:39 PM »
Hi everyone. Since the beginning of the year, I've been developing a 3D printer. We're actually finished with the printer, but I want to start blogging about my experiences with the machine. If anyone has parts they want printed, I'd be happy to print them for free. All I ask is that I have permission to blog about the process and share images of the finished part.

If anyone is interested, shoot me a message. I can print with ABS, PLA, PETG and flexible filament. The available print size is 6 x 6 x 9, but parts can always be broken into pieces, if larger than the available print volume.

Thanks!!
65
Software / Re: using the iphone as an rc transmitter
« Last post by DiegoChavez on August 10, 2014, 11:13:51 PM »
could you elaborate a bit on that for me please?
66
Mechanics and Construction / Re: Short Legs+Paw/feet help needed
« Last post by WriterOfMinds on August 10, 2014, 08:04:51 PM »
You've asked a very non-specific question -- so, if the design is already done, perhaps you could share more details?  Any constraints you can provide will make it easier for people to help, without wasting time by suggesting things that won't actually work for you.

Again, it's a very non-specific question.  For each of the things you asked about, there may be tens if not hundreds of options, and the best one for you will depend on things like your budget, available tools, where you live (some things might be hard to purchase in your area), and other aspects of the design.  So I would also suggest that you do some broad research in each area and come back with more specific questions.

In the absence of good information about your design, I can tell you a few things about the walker I'm currently working on.  The legs are made out of PVC conduit.  It's fairly light-weight, it's cheap, it won't rot or corrode, and it resists breakage.  The only real downside I can think of is that it's easy to cut, but unless you are building Battlebots that probably doesn't matter.   The joint design is detailed here: http://writerofminds.blogspot.com/2014/01/build-better-hinge-joint.html  These joints are not exactly professional, so if you can find and afford ready-made precise joints, you might want to do that.

I also have some feet which I may or may not put on the robot, which are made out of ... um ... bottle caps, with sections of ball-point pens for toes.  No, really.  You can build your stuff out of almost anything, just be creative.

My walker's legs are driven by linear actuators, with cheap stepper motors at the back end.  If you want a hopping robot, though ... that's a whole different ball game.  You need a fast but powerful movement, every so often.  I'm picturing either a way of storing and rapidly releasing tension (spring, surgical tubing, etc.) with a motor and gearbox to wind it up, or a pneumatic system.
67
Electronics / Re: using the iphone as an rc transmitter
« Last post by dbuhlbrown on August 10, 2014, 11:50:01 AM »
It would depend on what microcontroller or similar processor you are using. You may want to look into something called a Cellbot( http://www.cellbots.com ). I have done a couple research projects using them before and a lot of the techniques people use for making Cellbots could help you out a lot.

Personally I use an Android tablet and an Arduino using a bluetooth module, but I was not trying to transmit video then, only commands / sensor data. You could use 2 Android phones though. And that would require you to simply send the video feed from one phone to the second and then just control the robot with the "controller' phone you are using.
68
Misc / Re: Dramatic career change - please help
« Last post by jkerns on August 08, 2014, 06:11:51 PM »

I chose mechanical engineering as I think it gives me the best base. Unfortunately studies here look a bit different than in US for example. We do not have elective and core classes. Your only option is specialization which you can pick after 3rd year. Here is the list of the courses that my program has (it is my translation so some of the names may look a bit odd). Could you take a look at it and tell me your opinion?

Looks like a mechanical engineering curriculum  ;)

As long as you don't feel that there is too much repeat of your architecture background, and that's what you want to do, then there is no reason not to.

Is there an option for a graduate degree instead of a second bachelors degree? (You would probably have to pick up several classes to fill prerequisites - that would be the down side.)

Whatever degree you end up with, there will be a lot of "on the job" learning - my original degree was in mechanical engineering back in the day when you used punch cards and Fortran IV for programming (and mechanical engineers got a single two credit hour class in "programming"). But, by the time I left industry I was writing control system software in C.
69
Mechanics and Construction / Re: Motor selection - trying to understand stall torque
« Last post by jkerns on August 08, 2014, 04:10:28 PM »
Torque for a given motor will be proportional to current which will be, in turn, proportional to the applied voltage at any given speed.

So, if your motor has a stall torque of 700 at 12 volts, at 9.6 volts it will be about 700*(9.6/12) = 560 (ignoring any losses in the drive circuits, etc. )
70
Mechanics and Construction / Re: Motor selection - trying to understand stall torque
« Last post by pterrus on August 08, 2014, 03:00:16 PM »
What do you mean by drive circuit, the electronics?

Re: 420 vs 700, part of my concern is I'm not sure it's an apples to apples comparison.  The old motor data sheet has 7.2 V nominal, versus the new motor sheet which appears to be based on 12V.  Am I reading all of this right?  I'm assuming that stall torque varies appreciably with the actual voltage applied (that's true, right?)

The old motor only worked when it was significantly lighter.  By the time everything I want to add is on there, the weight will probably be double what it was.  Hence the concern that I didn't actually add enough margin.
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