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The robotic technology is advancing at a rapid pace. Though there is rapid adoption of robots in the industry, but on the consumer side we have still not seen any major product(other than quadcopters and iRobot ) which has penetrated the mass consumer market. I wonder if this is because of the fact that most robotic companies are trying to make robots and then come up with a problem which that robot can solve. Thus they are not solving any actual real world problem.

I have been studying about telepresence robots for a while and have even built an expressive telepresence robot(
).  I have started coming across people who are asking to rent telepresence robot or companies which are renting telepresence robot at events. Recently, through google ads I came across this service called Splinch ( http://www.thesplinch.com ), which claims to deliver robots at any event in US. From the page it looks like they are still in a very early stage.

The advantages of such a service are very clear. Anyone who has money problems, cannot attend an event because he/she does not have time, people who have some kind of disability which restricts their mobility and hence make travel a pain, or someone who has everything - a paid trip, time but cannot attend some event because of visa issue will be benefited by such a service. From all the blogs and research papers I have read people find the experience of remote presence very helpful and immersive, as if they were actually present there. But at the same time, the telepresence robots available in the market are not advanced, and have connectivity issues, or need someone to take care of them in case of network discussion or when the robot falls or gets stuck somewhere.

What are your opinion on the rise of these telepresence robot rental service? Are we witnessing a use case from where robots can start becoming a part of our day to day  life? Will such a service really solve a real world problem? Or is this a area which like the currently available social robots is trying to come up with a problem which fits it's technological capabilities? And any other comment or opinion, that can increase understanding of this will be greatly appreciated.


Electronics / Building an RF Transmitter and Receiver
« Last post by stevesy on May 29, 2016, 10:50:57 AM »
Hi, I'm new to this forum.

I'm trying to build a RF Transmitter and Receiver circuit for an omni-wheeled bot that looks and moves like one
Using continuous rotational servos. 

I'm finding the RC theory a little difficult and am hoping you guys can help me to understand it better so I can get a schematic together.

I need the servos/omni-wheels to be able to go forwards, backwards and stop in the way that the joysticks and knobs on the commerical transmitters would allow for. I'm thinking a momentary on-off-on toggle switch would allow me to do this?
I know I can use pretty much any frequency for the TX RX module as I'll be operating the robot by myself away from other RCs, so interference won't be an issue.

Knowing all the components needed e.g. diodes, transistors, capacitors etc. and putting them all together into a circuit diagram I'm not so sure about.  Should I end up with something similar to this:  http://www.wzmicro.com/rf.htm

Grateful for any help you can give, thanks.
I'm looking to find out, How do human-like legs compare to chicken legs and four-leg systems?

I'm interested in things like speed, agility, turning radius, complexity and cost.

For a design large enough for a person to ride, rider fatigue is also important -- how do they compare in terms of achievable ride smoothness, vibration, and so on?

Are there quantitative benefits of 3 DOF hip joints, compared to 2 DOF?

I realize other factors will come into play as well, such as actuators, joint designs and control systems. However, my interest at the moment is how basic leg designs compare to one another.
Mechanics and Construction / calculations and fundamentals once again
« Last post by cervantes on May 26, 2016, 02:51:07 PM »
Hi all,

that's me again with my thoughts and doubts.

First of all – I do not want to ask someone to calculate something for me.
I did my best (I hope correctly, based on your tutorials) – can anyone check it and answer my additional questions? I am especially interested in these questions – I always have some doubts during calculations.

Ok, so I need to roughly calculate carousel storage motor parameters. This is not a robot but I found your tutorials applicable for this.

I am assuming that only 5 of boxes on one side will be loaded with 200 kg. This is the worst case.
Imagine I want to lift the lowest one up to 6 meters in let’s say 30 seconds.
W= mgh= (5*200 kg) * 10 m/s^2 * 6 m = 60000J = 60 kJ
P= W/t = 60000 J/30 s = 2000 W = 2 kW <- required motor power

1) There is a gear in my sketch – does this gear has any influence to formulas for power used above?

2) By the way – if all boxes will be loaded to max can it be calculated like a lift with counterweight?
Can anyone provide more information about “counterweight effect” which “helps” motor?

Now let’s calculate a torque_motor and speed – it seems that tutorial example is the same:
torque_motor / radius_1 = torque_2 / radius_2
torque_2 / radius_2 = weight -> torque_2 = weight * radius_2
torque_motor / radius_1 = (weight * radius_2) / radius_2 -> torque_motor = weight * radius_1
so torque_motor = 10000N * 0,5m (more or less) = 5000 Nm

3) This is a minimum of course – how much additional percentage do you suggest to add considering belt efficiency etc.?

speed (0,2m/sec)
rps_motor * radius_1 = rps_gear_2 * radius_2
rps_gear2 * 2 * pi * radius_2 = velocity_weight -> rps_gear2 = velocity_weight / (2 * pi * radius_2)
rps_motor = ((velocity_weight / (2 * pi * radius_2)) * radius_2) / radius_1
rps_motor = velocity_weight / (2 * pi * radius_1)

4) BUT NOW  PLEASE NOTICE that there is no radius_2 in both of these equations (torque and speed)! So what’s the reason of this gear (bigger pulley)?... maybe equations are in the fact are not ok? so - looks like the weight can be attached directly to motor pulley????....

5) By the way – if torque and speed are given now, isn’t it natural that there must be a motor power which is combined with this parameters – on the other hand – was it required to determine power at the beginning of this post?

6) Any other tips for this application?
Misc / Re: Hello everyone at Society of Robots!
« Last post by gtabasso on May 25, 2016, 11:26:15 AM »
Hi Gina,

No, I haven't read Android Karenina. I looked it up a little bit. I'm actually more inclined to read robot stories where someone has a robot friend like in the movies Big Hero 6 or The Iron Giant  ;D. I tend to get quite emotional about those types of stories :'(, but I love them. There's a story that I recently learned about it's existence, called The Runaway Robot written by Lester Del Rey. I found out for that one, I'd need a box of tissues too. I would like to read that one sometime, even though some might call it a children's book, but I want to read it to know the story. I guess I'm a sucker for "robot friend" stories...

But thanks for asking about Android Karenina. I didn't know that book was around and now I know. :) I noticed you liked Lost in Space and The Jetsons in the other topic. Are any of those robots your favorite?

Oh, you probably would love The Silver Metal Lover. That is one of my favorite books. I cry every time I read it. It's a must have. No, I don't have a favorite robot. Well, maybe Silver in The Silver Metal Lover.
Misc / Re: Hello everyone at Society of Robots!
« Last post by mklrobo on May 22, 2016, 10:13:06 AM »
Hi cyberneticdreams,  :)

  I appreciate your insight into the spirit of robotics. That spirit has directed my nature in personal and
professional context. Some of my best friends, I built!(joke from Will Robinson- Lost in Space
The Chappie movie was a whole new class of robot(and theory), that I do not think society has really had time to digest what is the importance of the movie, except for Robot buffs. I like the realness of the movie.
One episode of Star Trek: Next Gen that is close to my heart is "The Offspring". Truly, at the end, I can not
help but collapsing into grief for Data.  :'(  The power of the writers become very evident in Star Trek.
I, robot and Big Hero 6 are awesome robot movies too!  There is a lot of potential and fun in robotics, never the less!  ;) ;D
Misc / Re: Hello everyone at Society of Robots!
« Last post by cyberneticdreams on May 20, 2016, 11:50:21 PM »
Hi Mklrobo,

I really like your reply! So your favorite is Data! That's awesome...any episode he's in is fascinating to watch what he does and how he communicates. Glad to hear he's your favorite.

I remember watching Star Trek: The Next Generation with my Dad when I was little (so this was back in the early 1990s). It was when I watched this show that I learned the word "android," and then "humanoid."

And CHAPPiE! OMG I love Chappie. For a long while I,Robot was my favorite robot film but now CHAPPiE is pretty much tying with it now. To list, my top 3 are I,Robot, CHAPPiE and Big Hero 6.  If someone asked me what is a movie I can't stop thinking about, it would be CHAPPiE. It's unlike any other robot movie I've ever seen. I may have empathized too much with Chappie (but I'm actually an empath, that's probably why). His robotic design is… it's very unusual, but the character is captivating to watch because of how he deals with his consciousness and experiences. Though, I should see Elysium in its entirety too... just because of the robots (I'm so bad!).

Mklrobo, do you have a favorite Data-centered episode of Star Trek: TNG? I haven't seen all episodes, but I've seen "Brothers", "The Offspring" and "Inheritance" on BBCA all within the last several months, so let's see what happens… ;)
Electronics / Re: Looking for a Small High Torque 12V DC Motor
« Last post by bdeuell on May 20, 2016, 07:49:43 PM »
superdroid robots has a good selection of geared BDC motors you could check out their selection.

i would be very cautious of any ebay china items. i definitely wouldn't trust the engineering data they provide ... but it seems like you figured this out
Electronics / Re: Looking for a Small High Torque 12V DC Motor
« Last post by dbassman on May 20, 2016, 10:52:44 AM »
It sounds like you have already tried some motors with these specs, what did not work?

First off, I have to admit I don't know a lot about this, but I'm trying to help my partner find a more powerful motor for our needs.

We got a couple different ones from China off ebay & they did not have the power of our current motor with lesser specs...  We're currently using this motor , but would like one that's a little stronger (more torque). Were also afraid with our current motor that the planetary gear pins will begin to fracture.

The other issue we're having is trying to find them at a reasonable cost, trying to stay around the $15-$30 range. If we have to spend more, we will… Just trying not to!

Any help would be greatly appreciated!
Electronics / Re: how to turn servo controller right with 555 IC ?
« Last post by bdeuell on May 18, 2016, 04:08:39 PM »
what is the value of the capacitor you used? the capacitor in the breadboard picture looks like an electrolytic cap which typically have higher values than the 100nF specified in the schematic.

i didn't check the values specified in the schematic but assuming they are appropriate for the signal the hobby servo needs i think the circuit should work.

other suggestions
- double check all your wiring
- replace the 555 timer IC (ensure it is installed in the correct orientation)
- check the voltages at different points in your circuit and make sure they are what you expect
- (if you have access to an oscilloscope) check the output signal and capacitor voltage 
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