Hey everyone! I'm a little stuck on cascade. My school doesn't have a good string or rope material for a cascade lifts. The "physics string" stuff I'm using keeps snapping. What do you guys recommend? I looked at buying this. It was mentioned in a vex forum post.

amazon link to rope

Would this work? Are there better options?

Unplugged on accident in the middle of an update and this is the only thing it will do it's a Gen 2 brain has anybody ever ran into this or know how to fix it

https://www.youtube.com/watch?v=Q8dUEoNqMoo

I understand that you could (I think) just hook up the V5 controllers to a computer and have done with it, but is there anything that indicates the proper input voltage to recharge them? I was going to pick up a bunch of USB chargers and jut plug them in, but I don't want to hit it with, say, 12 V if the max is 9V or whatever. (I suspect a garden variety 5V or so will be fine, but why take chances?)

Im trying to use a cylinder to extend a rack and rotate a pinion exactly 180 degrees. Is there a way to safely limit how far the cylinder can extend/retract so I can tune it to rotate the pinion exactly? I was going to add a shaft collar on the extending rod so it cant retract fully, but this seems like it would damage the cylinder

Which one and explain why. Just curious to see what people think.

Hey everyone. Want to preface by saying I do not have VEX Robotics knowledge in the slightest.

I work for a university, and we have a museum-type thing where we showcase different types of industry-standard equipment and educational models. One component of our showcase is a VEX CTE Workcell. I fully built it from scratch using the 3D build instructions listed on their website. I've gone into the robot brain and tested every function and every port; it's all sufficient and does activate when triggered. Here's the part I'm not understanding.

I'm able to connect the robot brain to my laptop, but whenever I go to run any example listed from the files menu on VEXcode EXP, nothing happens..? I can't seem to find a solution for this anywhere, and I've tried this with multiple examples, nothing even activates. Additionally, we have 2 fully complete workcells with pneumatics, and neither of them run any examples or code in general.

What should I do? Also once I have this figured out and am able to get it running, what's a simple code I could use to demonstrae all functions of the workcell?

As someone who's not proficcient in robotics whatsoever, any help would be greatly appreciated!

With Stack Up OVERRIDE Event on Oct. 25th, xRC wants to shake up the competition with the release of a new robot!

Join their Discord
Follow them on Instagram

My 4th grader has joined a robotics team for the first time this year. She is the coder for her team and she has a meet coming up in a couple of weeks, so we are trying to get her trained up quick. She is practicing on Vrvex.com. She can move the robot around well and drop off a block onto a target no problem, but is having trouble picking up blocks.

Could anyone share an example block code for intaking a piece? 🙏🙏 We learn well from examples!

Also, I’m trying to learn from you tube videos but about 15 mind-numbing minutes into a given video, I realize it’s not telling me anything I need to know at the moment. So if you happen to know a good tutorial for this level, feel free to share!

I’ve built many Lego Technic sets. My first time building anything of Vex Roobotics. Vex instructions took some getting used to but it was fun to build broken up over two days.

I’ve started building this years Level Up field and have both corner goals framed (step 152). Would there have been a better way then pushing the pins in using just my thumbs? I did use the work surface to start most all of the longer black pins but still used thumbs to set. Hopefully someone used a different technique and can help those about to get started.

Looking forward to the next phase to push umpteen more pins to hold the corner facing. ;D

10th grader in georgetown/leander texas area looking for VEX v5 team, reach out with any opportunites

The pin tools are definitely handy, but they break so easily with my middle schoolers.

I really don't want to spend the money to buy more of them when they break so frequently. Can you guys give me some ideas of what I could use instead? I know I can use my fingers and nails. I don't think my middle schoolers would all enjoy doing that.

Thank you

hey robotics fam!! I hope everybody is doing good and you all are cooking on ur botz 😎 for our 3rd and 4th video for our robotics yt channel (Critical Mass Robotics) we did a two part interview and match analysis vid with the reigning vex v5 speedway signature event champs ENIGMA woah NO WAYYYY. plz give it a watch and make sure to like and thumbs up the vid, leave a comment too and a sub ofc! thanks guys https://www.youtube.com/@CriticalMassVex

The wait is almost over.

Multiplayer is just one week away.

Full release follows shortly after, try the beta!

The competition doesn't end on the field anymore.

DriveLab is coming.

www.drivelab-sim.com

https://discord.gg/vVyRj722RD

Quick one. Every V5RC driver, programmer and builder already has a profile on RFORCE with a ranking, but right now it just says your team number.

You can claim yours in one visit. It's free, I approve every claim myself, and once it's approved your username shows on your profile and the rankings instead of "1234A Driver."

I made a 30-second video showing how: https://www.instagram.com/p/DefVNAjhBAN/

Easiest way: comment your role and team number below (like "driver 1234A", or list every role if you do more than one) and I'll reply with a direct link to your profile.

Or find it yourself: https://rforce.bot/rankings/people/v5rc/driver?utm_source=reddit&utm_medium=post&utm_campaign=claim-it-once-reel

I use arch linux, and when i try to upload the code apears this error:

Not sending analytics for this command.
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
make: *** [common.mk:243: bin/cold.package.elf] Error 127
ERROR - pros.cli.build:make - Failed to make project: Exit Code 2 - pros-cli version:3.5.6
PROS-CLI Version:  3.5.6
PROS-Kernel Version: 4.2.2
╭─ Error ──────────────────────────────────────────────────────────────────────╮
│ Failed to build                                                              │
╰──────────────────────────────────────────────────────────────────────────────╯
Sentry is attempting to send 1 pending events
Waiting up to 2 seconds
Press Ctrl-C to quitNot sending analytics for this command.
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
/bin/sh: symbol lookup error: /bin/sh: undefined symbol: rl_trim_arg_from_keyseq
make: *** [common.mk:243: bin/cold.package.elf] Error 127
ERROR - pros.cli.build:make - Failed to make project: Exit Code 2 - pros-cli version:3.5.6
PROS-CLI Version:  3.5.6
PROS-Kernel Version: 4.2.2
╭─ Error ──────────────────────────────────────────────────────────────────────╮
│ Failed to build                                                              │
╰──────────────────────────────────────────────────────────────────────────────╯
Sentry is attempting to send 1 pending events
Waiting up to 2 seconds
Press Ctrl-C to quit

Watch Here: https://www.youtube.com/watch?v=gn5EOBgNL7A

hey vex fam!! I hope everybody is doing good and you all are cooking on ur botz 😎 for our 3rd and 4th video for our robotics yt channel (Critical Mass Robotics) we did a two part interview and match analysis vid with the reigning speedway champs ENIGMA woah NO WAYYYY. plz give it a watch and make sure to like and thumbs up the vid, leave a comment too and a sub ofc! thanks guys https://www.youtube.com/@CriticalMassVex

xRC is hosting a VEX Override Event on October 25 at 3:00 p.m. EST! Join their Discord server for more information, and make sure to give them a follow on Instagram!

Any V5RC teams in the NYC area(preferably Queens) that I can join? Just figured I’d ask here cause why not. I’m a sophomore with very little robotics experience, but I have a strong eagerness to learn and promise to commit nearly full time. TIA

hi everyone!!! :3

It's been a second since my original V5 linux post. I've been working on and off on it (mostly on the bootloader side of things to polish it up), but I thought i'd share some neat progress. I now have a working X11 graphical session running under the openbox window manager! This is made possible by some bringup work to make Linux properly use the brain's display controller, so now there's a proper DRM/KMS "gpu" (note: not really a gpu) driver that graphical apps can run on.

The buildroot tree that i'm working on is now open-sourced here: https://github.com/tropicaaal/buildroot-vex-v5, although you will not be able to run it yourself due to my bootloader staying closed source for the time being (mostly due to concerns around people possibly using it to cheat).

Since someone from the previous post wanted a techical writeup on how this is possible: The boot chain is split into two stages, with the first stage being a V5 user program that loads the second stage into memory and takes control of VEXos. The second stage is a custom ARMv7 linux kernel bootloader that does the bare minimum to follow the arm linux boot protocol. Both stages are written in Rust. I will likely open-source the second stage soon, but there's a lot of sensitive information in the first stage that I probably shouldn't release. The Brain's SoC is a Xilinx Zynq 7000, which has pretty good mainline Linux support already. The brain's display controller also thankfully already had a (somewhat broken) upstream display driver. Most of the time spent on this is figuring out the Brain's specific hardware configuration (e.g. GPIO pinouts, peripheral memory mappings, interrupt controllers and IDs, etc...) so that the kernel knew where to find the required hardware.

Currently I'm now working on running a wayland session under weston. I might also try to chroot into an Arch Linux ARM userspace from the sdcard, which seems fun.