How to Synchronize 4 Motors in Python with MINDSTORMS Robot Inventor Gelo

[@fabianogalimberti2272]

you are my new programming star! Thanks for sharing.

[@dinoscheidt]

Nice. Software Engeneeir here that bought Mindstorms to play around during lockdown. Weird to have to solve synchronization issues all over again 😅 they should have used JavaScript ... anyway -> Subscribed !

[@AntonsMindstorms]

Let me know if you have questions or requests.

[@dinoscheidt]

@@AntonsMindstorms Sure, this may be a little high tech for some viewers but here is what I want to do: I do a lot of machine learning so right now I am building a parallel robot arm out of lego technic that can operate a touch surface (like a tablet). Above the tablet I will have a smartphone hanging that detects shapes with computer vision on the tablet and instructs the arm to tap on them. So related to that a couple ideas / questions: [1] What is the bluetooth latency of computer/smartphone -> to Mindstorms Inventor hub (critical for quick reaction application). [2] When going on AliExpress searching for “WeDo 2.0 Connector” you find a lot of suppliers. Many people have a raspberry pi at home and I am thinking to maybe build a break out board for the raspy (I didn’t find one!) to drive lego technic motors sensors directly from the raspy (and many more). Maybe you know more here, can explore an upgrade path from Mindstorms brick or mix and match with a raspy (Bluetooth latency again). [3] How to extend to more motors with Mindstorms inventor hub, i.e. by connecting to peer control+ hubs via bluetooth. [4] An overview of good GitHub libraries (so a video for programmers) to connect to, use or extend Mindstorms functionality. [5] Good strategies to zero home motors that are not the Mindstorms absolute positioned ones. I.e. the control plus motors have sensors too, but how to make most use of them. Also, since some control+ models (like the 4WD Yellow Crawler, the Liebherr etc) go through a calibration step first, sensing if a motor hits resistance for self calibration

[@AntonsMindstorms]

@@dinoscheidt ​ [1] Low. Usually, image recognition framerate is the limiting factor. [2] You can also just wait................ [3] This is in the works too. Check out Pybricks and ubluetooth [4] There is a Github library that does that. I lost the URL, but you'll find it. [5] This is a core part of Pybricks. run_until_stalled() [6] That's nice. I just finished a breakout to run the servos but I haven't started on the plastic connector parts. [7] Isn't most of it on Thingiverse? Some curation would be nice, however. I'd love to get a 3D printer sometime, but I just don't have time to play with it at the moment. I have enough ideas with LEGO bricks as they are.

[@dinoscheidt]

@@AntonsMindstorms thanks for the replies! Exited for [2]. Maybe some of that lends to videos for general viewers - but I appreciate the direct replies! Regarding [1]: do you have some concrete ms number or a link where to read up on that? I ask because I have other project ideas were latency could be an issue (not related to computer vision)

[@luvjs66791]

Hi! I have a question for you. I have been struggling the ev3 stair climber program. The "my block" piece is the one I'm having trouble with I really don't know what's the program in the my block... -Thanks! (Keep up with the great work!)

[@AntonsMindstorms]

I never made a stair climber. I would like to, one day.

[@rasmusjrgensen9623]

Hi, super nice contents! it really help me learning python. I have a question for you, how do I enable the drop down search function ? :) - Thanks :-)

[@planetplushy3705]

Cool video

[@ericbarnes8]

I find that the wordblock one 2:11 starts really rough, but it looks a little more fluid than the code 24:00. The body looks like it stay at more oven an even pace, but the other code it seems to go forward fast, and then slow down. Is it because it slows down and speeds up at certain part of the rotations? (Like the sine wave in your blog) Really well done. I learned a lot from the video. I love your little jokes :)

[@AntonsMindstorms]

It is because I use a P-controller only. With PI or PID it would be smoother. But that would also introduce a lot of complexity. The video is hard enough as it is. ;)

[@ericbarnes8]

@@AntonsMindstorms honestly, I'm not going to pretend I understand. I'll be need google what your saying to get up to speed. I'm gonna build Gelo now to give the code a shot, and try to figure it out. Super cool though and appreciate it.

[@ArtMGavr]

So you start from "it's looks not quite natural"... And what changes in the end? Why your python program better then wordblocks one?

[@AntonsMindstorms]

I agree. My next video will improve this.

[@drjuit]

can you control in scratch prime too?

[@AntonsMindstorms]

Yes, but you need a LOT of blocks.

[@drjuit]

@@AntonsMindstorms could you do a video on woed block version?

[@drjuit]

@@AntonsMindstorms do you have a 4 motor on 2 wheel, 2 eye ev3 program for sumobot?

[@AntonsMindstorms]

@@drjuit no, it's been a while since played sumo.

[@drjuit]

@@AntonsMindstorms I havent been able to make it work I have been trying it for 2 weeks, clould you please help me out? I can pay for your trouble

[@williamhuang5329]

Hanzhen harmonic drive gear , robot gear , joint gear reducer, over 30 years experience ,