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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 
Electronics / how to turn servo controller right with 555 IC ?
« Last post by converge on May 17, 2016, 09:28:08 PM »

Im very new to eletronic and Im trying to control a servo controller. Im able to turn it left, but how to turn it right ?

This is the diagram i followed:

And this is how I think it should be on breadboard:

Did I do something wrong ?
Misc / If you had a programmable robotic arm, what would you do with it?
« Last post by VIRGIL-Arm on May 16, 2016, 12:00:37 PM »
Hey Guys,

I'm trying to plan a few summer electronics projects that I can keep busy with.  I'm looking for some cool, useful applications that a robotic arm could be used for.  An example of an application would be an automated dog-fetch toy that can identify a ball, pick it up,and proceed to throw it.

If you have any cool idea, feel free to let me know!
Misc / Re: Hello everyone at Society of Robots!
« Last post by mklrobo on May 15, 2016, 11:53:39 AM »
 :) Hello!  :)
I thought I would respond to your insights in the robotic world.
My favorite robot, of course, is Data, on Star Trek's Next Generation.(surprised?)
The science fiction on the interaction of Data with the Crew of the Enterprise is one that
always intrigues me, and has given me lots of entertainment.
Robotics in movies like Chappie, Silent Running, Elysium, Forbidden Planet, and Star Wars provide
different perspectives on how robotics are used in different situations.
Real world robotics, of course, will be different, but indispensable. Technology can provide greater
resources for more people.(human work being converted into tech work/studies). In this exchange,
robotics offers great hope in resource management, where only impossibilities existed before.
Have not heard of Android Karenina, but will look into it. Thanks!!  ;) :) :D ;D
Misc / Re: Hello everyone at Society of Robots!
« Last post by cyberneticdreams on May 12, 2016, 11:00:19 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?
sorry about the weird title not sure how to word it, BUT, here's the thing.

I'm working on a project for which I need a way to create a resistance in the hands, It would be the kind of situation where without actually having any materials one would do a grabbing movement and it could feel as if it was grabbing a metal cup (limited give)

Drawings and/or photos of your existing setup would help.

It will probably be hard to find a narrow (i'm guessing you are thinking ~1/4") timing belt pulley with a 2" bore. You may need to modify or otherwise manufacture a custom pulley to go this route.
Electronics / Re: Looking for a Small High Torque 12V DC Motor
« Last post by bdeuell on May 10, 2016, 07:24:36 PM »
It sounds like you have already tried some motors with these specs, what did not work?
I am designing a robot for industrial use.  I am currently using a worm drive gearbox that drives the rotation using a V-belt system.  To permit the end user to disengage the drive mechanism, and move the equipment by hand, there is a clutch-like mechanism that adjusts tension on the V-belt. So, when the v-belt is slack, they can move it by hand.

However, this design also means that the encoder I have on the motor is not going to help me after the user has made use of the clutch.  So, I need an encoder on the main shaft of the equipment.  Currently, I have a 5-sensor Single Track Grey Code system that gives me 12deg of resolution.

However, ideally I would like much better resolution.  So, I am trying to work a commercial absolute encoder into the system. I have a hollow shaft that is 1 1/4" Dia, and a solid shaft that is 2" Dia.  Here is one that can adapt to various shafts,
But, its max is an 8mm shaft.  And since my 1 1/4" Dia. shaft is hollow to allow for wiring to go though, I can't just make a adapter at the end.

So, I think I need to use a timing belt connection to tie the large shaft to the small shaft of an encoder.  But, this is proving to be a challenge as well.  The timing belt pulleys I find, that are for narrow belts, do not come with large bore sizes.  At Martin Sprocket, their timing belt pulleys that can handle my Shafts are for 1/2" belts, and the pulley is 1 3/8" Thick. I don't have much space to fit this, and this is a bit tight for my space.  I also would prefer a thinner belt, so hopefully my encoder can just take the pulley without any special effort to support the force of the belt and weight of the pulley.

Any suggestions for a source for timing belt pulleys for narrow belts, but for up to a 2" dia shaft? Or alternatively, a different method of putting an encoder on a shaft, but not on the end?

Thanks for any ideas,
Robot Videos / Re: Worlds Largest Walking Robot
« Last post by gtabasso on May 10, 2016, 10:36:13 AM »
My buddy Tim is building a 50-foot dragon now but its exoskeleton is not as fancy. His is cool though! He's doing it in his garage with industrial surplus parts. I will post photos when it's done.
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