Catch My Jugglebot Talk and Help Solve a Tech Puzzle (CAN Bus) | PDJ #20

Hello, juggling enthusiasts and robot lovers! It's time for some Jugglebot updates and a special announcement! 🎉
First things first, I'm thrilled to invite you to an upcoming talk I'm giving about the Jugglebot project. This is a unique opportunity to get a behind-the-scenes look at everything that goes into bringing Jugglebot to life. I'll be talking about the project's conception, the challenges I've faced along the way, and the successes we've achieved so far.
I'd love to hear your thoughts about what I should cover during the talk. What aspect of Jugglebot are you most curious about? Have any burning questions about how a juggling robot comes to life? Drop your suggestions in the comments below.
In other news, I'm excited to give you a sneak-peak at the new linear actuator design. It's still a work in progress, but your feedback from the last video has been incredibly helpful in shaping this new model.
However, it's not all smooth sailing - we're currently experiencing some issues with the CAN bus and ODrives. If you're a tech whiz with experience in this area, we need your expertise! Let's solve this tech puzzle together and get Jugglebot up and running!
LINKS TO THINGS MENTIONED IN THE VIDEO:
**** Reddit Robotics Showcase ****
redditroboticsshowcase.wordpr...
Livestream where the talk will be held:
• RRS 2023 Session 1 - R...
**** Boston Dynamics CEO Podcast ****
• Robert Playter: Boston...
**** CAN Bus ODrive Issue ****
discourse.odriverobotics.com/...
**** Patreon Page ****
/ harrisonlow
00:00 - Reddit Robotics Showcase Talk
00:38 - Update on Linear Actuator Design
02:00 - CAN Bus Problems

[@isstuff]

Looking forward to seeing the new actuator design. It looks like a tight loop from the glimpse you showed. It’s so cool that you can bounce off the viewers ideas and then turn it into a better design.

[@MK-lk7nc]

Good luck!

[@PeterWallhead]

Replied to your forum post 🤞

[@harrisonlow]

Interesting - I'll check what data type I'm sending when I'm next working on this stuff. Cheers for the suggestion!

[@alexanderscholz8855]

Ask at the duet reprap forum, because they do all stuff with 3d printer and cnc and the like ideas to push the limits of there Firmware or the klipper guys and marlinfw guys. If they can held you out.

[@harrisonlow]

Good idea, thanks!

[@mmemetea]

Regarding your CAN Bus issue, I would make sure to always use twisted cables to avoid EM interferences. I'm not sure your current cabling is CAN Bus ready, and this could cause the issue, especially near the motors. Good luck!

[@harrisonlow]

Hmm yeah I've heard that sentiment before. I'm using shielded wire (braid + foil) because that's all I have on hand. I could try a twisted pair, but that wouldn't be shielded and I'd think that would be worse than a shielded non-twisted pair?

[@matthahne]

@@harrisonlow not necessarily. Because CAN uses differential signal, external interference isn't an issue as long as both wires see exactly the same interference. Since you subtract one signal from the other to extract the bits, adding the same external value to both makes no difference.

[@harrisonlow]

​@@matthahne I've been reading a lot about this today and it sounds like what you said is true for the most part, but there are (apparently) situations where you can "overload" the system and the differential doesn't work properly. Do you know anything about that? It's possible I misread the forum post or they were just talking out their ass
I did end up making a twisted wire pair today to "dot all my i's", but the problem persists 😢

[@FilmFactry]

Are you Using Canbus FD? or regular can? Duet/Reprap firmware hardware uses CANBUS FD because it handles greater bandwidth. CAN FD (Controller Area Network Flexible Data-Rate)

[@harrisonlow]

Just regular CAN for now. I think its capacity is huge for what I'm doing with it