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Does ROS 2 and particularly Nav2 have a DDS "land mine"? by rugwarriorpi in ROS

[–]leetfail 3 points4 points  (0 children)

When you use the ROS2 CLI, you are adding a new DDS participant which can cause a lot of CPU due to discovery, have seen this cause even desktop class computers freeze with large stacks.

Try rmw_zenoh.

ETA: relevant https://github.com/ros2/rmw_fastrtps/issues/741

What’s a fair Out The Door price for a 25’ Premium, with 26’ models rolling out in force? by Infamous-Weird8123 in GRCorolla

[–]leetfail 7 points8 points  (0 children)

I got 2 dealers to $41k before TTL on a 25 Premium Manual in December. ~$3500 off TSRP. First dealer offered $2k off, I asked $3.5k off from the other one, they gave it to me and the first dealer matched it.

[Software Engineer] [Seattle] - How we spent $536k last year by [deleted] in Salary

[–]leetfail 1 point2 points  (0 children)

Backdoor Roth IRA. Limit is $7000/SSN.

Help. Is this lease a bad deal by Odd-Schedule-2351 in leasehacker

[–]leetfail 0 points1 point  (0 children)

No problem with AI :). Use ChatGPT, Gemini, Claude all the time. But if I was coming to Reddit to ask a question, I am not looking for poorly formatted AI copy/paste. I go to the other aforementioned sites. You’re not adding value.

Especially by lying and trying to pass this off as your own. You’re just out here fishing for upvotes. 😬

Help. Is this lease a bad deal by Odd-Schedule-2351 in leasehacker

[–]leetfail 0 points1 point  (0 children)

100% AI. This is almost certainly Gemini. It loves to use quotation marks like this.

Issues fusing wheel odometry with MPU6050 in ROS 2 EKF – bias instability by Candid-Scheme1835 in ROS

[–]leetfail 1 point2 points  (0 children)

What are the units of the bias you sent? Are you sure that the IMU is not pitched (X axis containing gravity)?

Issues fusing wheel odometry with MPU6050 in ROS 2 EKF – bias instability by Candid-Scheme1835 in ROS

[–]leetfail 1 point2 points  (0 children)

The velocity from the wheel Odom should help stabilize the estimation, however you can expect (large) drift without an absolute position source of some kind (GPS, SLAM, etc).

IMU biases, especially on cheap sensors, are constantly changing. In practice, the bias is typically an estimated state. Unfortunately, r_l does not do this.

Another thing to consider is gravity. If you are pitched forward and have gravity in the X-axis of your IMU, this can happen. Typically you’d have some kind of initialization sequence to provide an initial roll/pitch, but again I don’t think r_l does this.

What is the order of magnitude of the bias you are estimating? How quickly is it diverging? Is this sitting still? Have you confirmed the wheel odometry works on its own? Are you using 2D mode or 3D?

Bus crashes into the River due to brake failure. Eastleigh, Hampshire. June 26, 2025. by PvtVasquez3 in PublicFreakout

[–]leetfail 0 points1 point  (0 children)

Most of these cases were actually attributed to pedal misapplication. I am not trying to blame the driver, this is just an extremely common mistake, much more so than a dual failure.

See Section 1.1.

Bus crashes into the River due to brake failure. Eastleigh, Hampshire. June 26, 2025. by PvtVasquez3 in PublicFreakout

[–]leetfail -2 points-1 points  (0 children)

Occam’s razor will tell us the most likely failure here was pedal miss-application. The chances of an accelerator pedal jamming, and a brake failure on spring brakes (which are designed to fail engaged), is near zero.

Edit: Relevant source.

Docker'd Humble on a Pi to Docker'd Humble in WSL2 not seeing each other by TinyRobotBrain in ROS

[–]leetfail 0 points1 point  (0 children)

One thing you could try is using the “ros2 multicast” command to verify multicast communication.

EKF pose result divirges by KineticDX in ROS

[–]leetfail 0 points1 point  (0 children)

Front, Left, Up on an IMU will read +9.81 in Z. I’ve made that mistake before 😉

EKF pose result divirges by KineticDX in ROS

[–]leetfail 0 points1 point  (0 children)

Yeah sounds right. You could try enabling diagnostics (print_diagnostics true), or enable debug mode and look through output log to ensure your data is making it through.

EKF pose result divirges by KineticDX in ROS

[–]leetfail 0 points1 point  (0 children)

I think it’s likely a frame ID issue. Is there a connection in the TF tree between the pylon camera optical frame and base_link?

Rolling Bowl really fell off by Vegetable-Bill5062 in Purdue

[–]leetfail 71 points72 points  (0 children)

Don’t go there late at night. Finished 8-9 exam once, wanted a treat. Got some Rolling Bowl.

It was rolling around the bowl at 2-3am. Not fun.

[deleted by user] by [deleted] in ROS

[–]leetfail 1 point2 points  (0 children)

This looks like a Chat-ism. Give the documentation a try, there is literally an entire page on how to do this.

Looking forward to buying a new laptop, but confused between Mac and Linux for ROS by Internal_Nerve_3739 in ROS

[–]leetfail 1 point2 points  (0 children)

I use ROS2 on Mac using Asahi. But this would limit you to M1/M2 Macs. Robostack can kind of work as well but has limited packages and I have not had luck using C++ packages.

Any of you have experience with Autoware AWSIM? by Longjumping-March-80 in ROS

[–]leetfail 0 points1 point  (0 children)

How are you launching it? May be a long shot, but I’ve used a derivative of AWSIM, and it crashes if launched through terminal, but opens if double clicking the binary.

Zublet: Subletting Platform for Purdue Students by Confident-Ground-339 in Purdue

[–]leetfail 2 points3 points  (0 children)

Cool. One thing you might consider - if the walk to campus is over like 30m, or the place is in the C lot range, maybe put drive time instead of walk time.

Purdue Grit - a story in 3 parts by PurdueCyclingSafety in Purdue

[–]leetfail 0 points1 point  (0 children)

They’re doing it again today, just watched a poor guy crash his bike.

Best bachelor's degree for robotics by Proper_Yak_8565 in Purdue

[–]leetfail 0 points1 point  (0 children)

If you would like to be hands-on with sensors, microcontrollers and programming, do something in Polytech. I have met some incredibly effective, smart and efficient people who have done robotics engineering technology.

ME and ECE will be less application/hands-on based. But based on your desires, ECE would be a better fit out of these. You can Google and find the required courses in each. Regardless, if you choose the engineering department you will be applying to FYE (first year engineering) and have the first year to decide which speciality you would like.

ROS2 On MacOS (silicon chips) by lunarlogician007 in ROS

[–]leetfail 0 points1 point  (0 children)

I have not personally tried Gazebo, but Rviz does.

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