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Robot Videos / Re: My robot taking its first (and wobbly) steps
« Last post by rouncer on April 26, 2018, 09:15:13 AM »
thanks for reply.
i bet if you had grips to him it would look way better when he walks.    :) going good!
Robot Videos / Re: My robot taking its first (and wobbly) steps
« Last post by Sebediah on April 25, 2018, 12:54:31 PM »
Right now he is running on an old and really slow laptop. I've been using that while coding him so currently it is also running his scripts when he is powered on. Later this spring I will be buying one of those mini PC's for him, so when I have a stable version that I want him to use, I can just transfer it over to that and have a small lightweight PC that I can just have in my backpack or something when I bring him somewhere. The microcontroller uses wifi to connect to a computer so there's no need for it to be physically inside the robot.
Electronics / Re: Full color 3D printer for the robotics
« Last post by rouncer on April 25, 2018, 05:23:01 AM »
why all this effort in making colour,  when electronic materials are so much more important.
I am doubtful you are any high up member of this company manufacturing this product, your just a little side salesman.

Ive got my theory on this subject, and it is further disorienting me every year,  the closer to the "SOURCE" of things I GET.
Misc / Re: Tech Tip - The Measurement of Torque
« Last post by rouncer on April 25, 2018, 05:04:08 AM »
grats for that.

getting bloody complicated.    but i was wondering a cool video to go with this is actually finding the heavy long of an unknown motor.
And also...  hang on,  my engineer senses are tingling.

im slightly confused -  cant we put any source with any motor, in other words oversaturate the motor with power,  and get a more upper amount of force, from the same device.

also - isnt transforming the source to be slower moving much more in an electrical situation??? because slower moving thicker energy = more attraction.
Robot Videos / Re: My robot taking its first (and wobbly) steps
« Last post by rouncer on April 24, 2018, 08:02:05 AM »
What kind of computer are u using for his brain?
Mechanics and Construction / New Stepper Motor
« Last post by benedictzhang2018032 on April 19, 2018, 08:13:53 PM »
Stepper Motors provide precise position and speed control, without the need for feedback devices to sense position. The operation of step motors is controlled through electrical pulses that the drive converts to current flowing through the windings of the motor. As the current is switched the motor rotates in precise steps of a fixed angle. The motor and drive constitutes a low cost control system that is precise and simple to construct.

Misc / Tech Tip - The Measurement of Torque
« Last post by ServoCity on April 19, 2018, 08:42:38 AM »
In our latest Secret Life of a Servo series Jason dives into the world of understanding the measurement of servo torque!

Electronics / ac motor get stuck when changing direction
« Last post by assaf on April 16, 2018, 10:59:05 AM »
Hi everybody,
I am building a motion driving simulator.
it has six ac motors (400v 2 pole 3 phase 750w)
and six vfd's (telemecanique altivar 16 750w)
i bought a controller that someone builds for simulators that connects to the pc and control the six vfd's.
this controller send speed and direction commands to the vfd's (by changing voltage)
every vfd is connected to a resistor that acts as a brake.

only one of the motors get stuck sometimes when changing the direction of rotation.
when it gets stuck the vfd shows its output current is about 1A.
sometimes it get unstuck after a few seconds. sometimes not.

when i disconnect the GND between the controller and vfd and reconnect it gets unstuck.
also if i press and release the STOP button on the controller board it gets unstuck

tried connecting the motor and vfd to another output on the board. works fine

Software / Re: problem in understanding and implementing pure pursuit algorithm
« Last post by rouncer on April 12, 2018, 08:40:15 AM »
Just some basic trigonometry here, it should definitely work when you get it finished.

But I think it could be alot simpler than this.

Just get the difference of the target and the current position.

then get the angle of the vector.

then subtract the angle from the cars angle,  and the tricky thing with this way,  is you have to decide to wrap the circle or not.

Keep going,  its a basic program youll get it,  its in lots of old arcade games - this code,  for running spaceships around like asteroids or space pilot.  (you should be right by yourself.)
Robot Videos / Re: My robot taking its first (and wobbly) steps
« Last post by Sebediah on April 12, 2018, 03:30:25 AM »
Hey there! Sorry for such a late response, I've been in the middle of a move so haven't had time to keep up with all the forums. To answer your question: Yes I certainly do! Lately I've been upgrading Dorian's hardware to make him more stable and capable of proper interaction with people. I'm planning on actively developing Dorian for at least another two years, even though I will begin prototyping a new robot later this year.

My main plans for Dorian is to bring him outside to events and also just generally expose him to people in various places. Hoping I can develop him in a way that will make people engaged and curious about social robots in general  :)

If you're interested in the upgrades and the stuff coming up this summer, keep an eye on my youtube channel!
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