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Electronics / Re: problems (with TinyESC)
« Last post by ashbrlmd on October 31, 2017, 04:59:22 AM »
Hello, i'm not familiar with esc. why don't you try L293D motor driver?
I am a  programmer and I recently began studying some electronics & AVR programming.

I am trying to use a step down voltage regulator (LM2678-5.0 datasheet) to transform battery voltage (9/12V) into a suitable 5V. I am not using a simple LM7805 since this is part of a bigger robotic project, where I need to transform more than 1A, and it would be nice to spare energy (=less battery weight).

I built this schematic (photos below); with a 10kOhm load I get 5.02V; but as I attach a load to it, voltage drops. As example, as I attach a 20mA led, I get about 3V. I tried attaching a little (~400mA) motor, but it doesn't start (there's no voltage!).

Any suggestions? Thanks in advance

BTW,the inductors and capacitors has been chosen accordnigly to Texas Instruments online simulation tool.
Mechanics and Construction / Robotic arm select servo motors
« Last post by efirvida on October 24, 2017, 01:41:38 PM »
Hi i?m designing a robotic arm based on this idea of the [NOVABOT][1] I only want to change its structural parts by aluminum tubes. In this design [3D][2] model it use the servo hs-311 wish have a max torque of 3.7 kg/cm, and its made of some plastic material.

I made my calculations following [this url][3] and made a excel that I append here... the mass of my design have been taken from iProperties of Autodesk Inventor, so they are in mass units not in weight. And I?m dismissing the mass of the joints (m5,m6) to have a first idea of the values, because I dont have the selected motors.

And my problems is that I think I?m missing something here because the it results in a very high torque motors, for this simple design.

[here is my excel][4]

  [1]: https://www.behance.net/gallery/47856101/NOVABOT
  [2]: https://grabcad.com/library/novabot-industrial-robot-design-concept-1
  [3]: http://www.societyofrobots.com/robot_arm_tutorial.shtml#joint_force
  [4]: https://mega.nz/#!XRwDmbQR!jY_BNDgnkUeu2V4_tonrNdlxFQoix7zs1SRXicYOdSQ
Misc / Voice-Controlled Robots
« Last post by stevesy on October 17, 2017, 02:56:12 PM »
Hi all,

I'm new to this forum.  Just wondering if any of you know what the most famous or state-of-the-art voice-controlled robots are these days?  I'm doing a literature review for a college project (a voice-controlled mobile robot) and would really appreciate any help you could give.

Many thanks,

Software / beginning 3d camera, from colours only.
« Last post by rouncer on October 16, 2017, 08:51:37 AM »
Uses scale invarience,  but not to compare relative depths,   it uses it to normalize a 3d compute coming from a blurred sobel filter,  and i get this:  :)

sorta pops in and out at times, a 3dishness.

You can do alot better than this but - i just need a bit of time.
My new version of this is on the way,  with isotropic averaging and the relative depth comparison, that I was missing before.
I remember someone else was talking about 3d ages ago and said to use some kind of scale detector, which you can get from counting edge density.
Misc / [advertisement] New Cascading X-Rail Slide Kit!
« Last post by ServoCity on October 13, 2017, 10:28:39 AM »
The NEW Cascading X-Rail Slide Kit provides all the mechanical pieces necessary to build a winch-driven extendable arm.  Fasten a motor or HS-785HB servo to the first stage of the slide kit and spool up the provided synthetic cable to get up to 34.5" of arm extension!  This kit uses bearings throughout - each stage is supported by 4 Mini V-Wheels that lock into the chamfered guides of the X-Rail.  The synthetic cable is routed over ultra smooth v-bearings so the torque provided by the servo or motor can be transformed into linear thrust rather than lost due to friction.  The arm, at full extension is rated for a 2lb load; perfect for adding a gripper or grapple hook.

Misc / Re: Check out my robotics blog!
« Last post by digibloke12 on October 11, 2017, 07:31:18 PM »
Great share!  :)

Since I've got a lot of stuff going on in my life, the last blog I've read was It?s Time to Make Way for Smart Robots in Your Industry!. This is a blog on a company's website where you can also source parts from, which I came across when I got interested in Robotics and went on to browse websites related to such.
Misc / SALE NOW Thru Sept 27th- ServoCity
« Last post by ServoCity on September 25, 2017, 08:33:11 AM »
Hurry while inventory lasts on our ACTOBOTICS and HITEC SERVO SALE !!!

click the link below to check out the massive savings this fall


Misc / Re: Motor for spinning wheel
« Last post by digibloke12 on September 10, 2017, 05:36:17 PM »

You can check out Power Jack Motion's Electric Motor range. They do have a wide, interesting line of products, so your choices won't be limited. Aside from RPM, there are a lot of considerations you need to do in order to select the right motor; the site's brief discussion on selecting such can provide you an overview of what's going to be the best motor for your needs.

Hope this helps!
Electronics / problems (with TinyESC)
« Last post by arduinors on September 09, 2017, 04:24:30 PM »
I'm making a car, that will be able to follow another car and I'm using tinyESC to control the speed of the motor. I use two Tinys and one somehow malfunctioned and is driving slower than the other. Does anybody has any idea what could be a problem? I've taken all the parts off and back on, and everything seems fine to me.
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