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41
Misc / Simple Solar Tracking Robot- ServoCity
« Last post by ServoCity on August 14, 2017, 09:02:41 AM »
Build your own Solar Tracking Robot with only a handful of components



https://www.servocity.com/projects/view/project/id/348

42
Misc / Re: WHAT IS A SERVO????????
« Last post by Doug83 on August 13, 2017, 03:05:02 AM »
A servo is a positional motor: you tell it to rotate (a shaft) or move (a linear actuator) to a certain position, and it will try to do that.
A servo mechanism is basically an actuator (such as a motor) with a closed loop feedback system. ...
Also the term "servo" indicates some type of feedback control loop, but how far that feedback extends makes a big difference.

R/C servos and "CNC-style" servos are both called "servos", but they are not the same things.

When talking about smaller hobby robots, usually the term "servo" refers to the remote-control toy servos.
Most remote-control (or R/C) servos don't really constitute a closed loop, since they don't report their position back to whatever is controlling them.
They will try to move to the indicated position, and will try to maintain the position under varying loads, but if they're wrong you still can't tell just from the servo alone.
....
When building toy robots, hobby servos are easy to use mainly because they are inexpensive and because they come in a design that is convenient to use.
Stepper motors can work too. They can deliver much higher constant power levels, but they are not as compact or as inexpensive.

In general--R/C servos are built for intermittent use and light loads.
They are designed as control motors for small toys, and they work well for that.
Industrial robots don't use them however, because of the lack of true closed-loop control.

------

Industrial "CNC-type" servos use a motor coupled to a positional encoder.
Every time the servo's motor is told to move any distance, the movement is constantly verified by the positional encoder and that result gets reported back to whatever is controlling the whole servo.
Also--at any time you want, you can have the controlling computer ask the (industrial) servo what its current position really is, and it can tell you, by checking the positional encoder.
So the whole time a CNC-style servo is being used, it is always being verified that it is in the exact correct position that it should be.
If anything moves the servo when the servo's motor is not running, you can still find that out too.

Lastly: among industrial servos, the term does not imply any particular type of motor.
There are servos made with brushed-DC motors, brushless motors (3-phase BLDC) and stepper motors,,,, as well as pneumatic and hydraulic motors AND linear actuators using any of these as well.

43
What are the fields that are using the robotics technology?
44
For Sale / [INS] inertial navigation system
« Last post by Tersus GNSS on August 11, 2017, 03:23:52 AM »
Tersus GNSS-Aided Inertial Navigation System (INS-T-306) is OEM version of new generation, fully-integrated, combined L1/L2 GPS, GLONASS and BDS navigation and high-performance strapdown system, that determines position, velocity and absolute orientation (Heading, Pitch and Roll) for any device on which it is mounted. Horizontal and Vertical Position, Velocity and Orientation are determined with high accuracy for both motionless and dynamic applications.

More details: www.tersus-gnss.com/products/inertial-navigation-system

45
Robot Videos / [Demo] Auto steering a tractor
« Last post by Tersus GNSS on August 11, 2017, 03:19:01 AM »
46
Mechanics and Construction / Re: I hit Paydirt!!!
« Last post by jester65 on August 10, 2017, 07:00:45 AM »
outstanding  Im hoping to run into something similar someday, but at least somebody found that deal before it got wasted and it was a robot builder who enjoys that  kind of material, good for you  man enjoy it and make its second life proud 
47
Mechanics and Construction / Re: newbie to robotics
« Last post by jester65 on August 10, 2017, 06:55:29 AM »
well flow chart what all you want the robot to be able to do when done , we know its going to have to be mobile and have to carry payload  so you kind of need to define work envelope and parameters for the robot to perform, how fast and how much for how long is where Id start, hope this might help a little bit.
48
Robot Videos / Re: One of my proud creations. The super cheap humanoid
« Last post by PerceptualRobots on August 10, 2017, 04:16:59 AM »
Looks very interesting, I am interested in applying my approach to a humanoid robot. Where do I find the write-ups?

My area is control systems which may be of interest. See my initial post.

Where are you based?

Regards,
Rupert

49
Misc / Re-writing robotics
« Last post by PerceptualRobots on August 10, 2017, 04:11:10 AM »
Hello,

You may be interested in a new approach to robotics described in my paper which has just been published in the Artificial Life journal.

"A General Architecture for Robotics Systems: A Perception-Based Approach to Artificial Life",

http://www.mitpressjournals.org/doi/pdf/10.1162/ARTL_a_00229.

The approach is based on the concept that the behaviour of living systems is a process of controlling perceptions, rather than controlling or computing (behavioural) output. In principle, the complex behaviour that we observe emerges just from a hierarchy of these simple feedback control systems, and accounts for all types and levels of behaviour.

Applying this perspective to robotics has significant implications, such as explicit, predictive models are not required, the systems are inherently adaptive and are not prone to unpredictable disturbances or changes in system parameters (e.g. weight or length of limbs), they are computationally lightweight and are comprised of a simple, universal process.

For example, this video shows control of a robot arm without the need for the complexity of predictive modelling or kinematics,

If you are not able to access the paper let me know and I can send you a copy.

If you'd like to hear about the progress of the development of this new technology you can subscribe to my newsletter at the top of the website (perceptualrobots.com).

Regards,
Rupert

www.perceptualrobots.com
50
Electronics / controller for brushless DC electrocraft motor
« Last post by jester65 on August 09, 2017, 08:53:42 PM »
Hey ,
 I was wondering if anybody could give me some info on what i need to make a couple motors I bought off Ebay for a R/C lawnmower build  and ended up with pride electrocraft  brushless dc motors  off a quantum from everything I can gather ,  Im  trying to figure my way out of this  and can I just get a controller that works with those type motors and  then adapt from there  If so does anybody know which contoller I need  maybe numbers ?   the number on the motor are electrocraft  model number BDC-3330 part no. 1842419053   this information is just what I read through the evening so If I have mis spoke  I apologies Im just trying to  bail myself out of a pickle at the moment  from buying wrong type motor , I was thinking a simple brushed DC motor  black and red and away we go,  any help  would be greatly appreciated
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