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Dynamixels! (Patreon)

Published:
2021-02-04 16:16:23
Imported:
2026-06
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Content

Well my Dynamixel servos turned up, sponsored by ROBOTIS, for the Really Useful Robot Arm. I posted some concept pictures for Patrons further down my Patreon wall.

These feel really solid heavy duty units. I have:

5x   XM540-W270-T  for the main arm joints.

2x   XC-430-W240-T  for the robot's camera pan and potentially a gripper.

All of these run on the same TTL bus and I have the MKR format shield which works with 3.3v microcontrollers - although I'll have to jumper that onto a Teensy. Not sure if the arm gets a separate Teensy running another ROSserial node, or I'll just use the existing Teensy in the base of the robot.

After some testing, I need to get on with the actual design for the arm, so that will be coming up in due course. 

Next week's video for Patrons involves high voltages - preview coming up tomorrow.


Files

Previews only

Comments

Adarsha

Any chance you can collaborate with https://youtube.com/c/Skyentific? He has done many detailed analysis of various servo control systems and seems to be really knowledgeable.

XRobots
>>52911566

I follow his channel. It's possible in the future but travelling is hard at the moment (not actually sure where he's located). I'm hoping for more support from ROBOTIS in the future.

Anonymous

😳🤩🤩😱😌🥰

Thomas Messerschmidt

I LOVE dynamixels! Their serial bus is so much better when you need to run 10 or 20 servos to one microcontroller. Still they are much more expensive than standard servos. A friend of mine worked for Robotis for a while. Also, Robotis came to a few of our club (Robotics Society of Southern California - RSSC) meetings.

Thomas Messerschmidt

James, your name comes up all the time at our monthly meetings. You have quite a few followers here. In fact, the next time you make it out to S. California, we would be honored if you would attend one of our meetings.

XRobots
>>52967068

I'd like to do a US tour of collaborations, but we'll see how the world goes I guess!

Darius Zaerin
>>52911566

i enjoy his channel too so it would be fun go see, but it'll take some thinking to come up with something where you'll actually benefit from the others' knowledge, since you both already build incredible robots independently. at one point he challenged himself to building a robot arm in 1 month, so maybe a robot design challenge would be a good idea, and something you could work on independently if you agree on a task or goal, then meet up for a showdown. he's in switzerland i believe, near lake constance.

XRobots
>>52911566

That's my sort of thing, although it means both putting out a very similar video of the 'reveal' for the challenge. I need a strategy for collaborations generally once the world if back to normal.

Darius Zaerin
>>52911566

maybe the challenge could be to build a telepresence robot with additional features, and either you send your robots to eachother or you control his and he yours, and you complete tasks with them, like some of those robot championships there are. you're already going that way with the RUS. you each set up an agreed obstacle course or challenge and post your robot's attempt. new obstacle courses can be new episodes, and maybe other creators can compete too. or you agree on a platform to build on. with your latest projects being open source, they could be a starting point and you have design challenges for specific features going from there. your universal navigation module for example is a great asset. you can both have that same brain but build your own locomotion platform for a certain terrain or obstacle, and for certain challenges. thats stuff all that could work even if the world is as it is, and its actually all the more relevant and interesting for it. i know they're big tasks but it adds an element of competition and could turn onto a bigger ongoing hit, like robot wars! :-D

Adam Purdie

I'm currently working on ROS controlled dynamixels, i think the best option is to use micro ros: https://micro-ros.github.io/ - this way the teensy can take rosmessages over serial :) the teensy3.5/6 and 4's have plenty of grunt - I'm pretty new to ROS so i'll probably just write my own arduino based basic control (using an OpenCR1.0) and use rosserial to get going but it's worth looking into!

XRobots
>>53033091

Thanks for that, I've not looked at ROS2 yet - it looks like a better version of ROSserial? I'll probably get the robot up and running with what I know first.