Blurry Limelight

Seems to be a similar issue to this thread.

We have an issue here on a Limelight 3 that we purchased at the beginning of this season through Andymark.

We noticed the blurriness at out district championship in April but it wasn’t really an issue for us because we never were able to get the vision support on the robot up to speed.

Then we lost our teacher in the school so we haven’t been able to verify the issue until recently.

When we purchased everything was fine - but now everything is extremely blurry. It’s like the auto focusing is not working or something.

Have you got any documents we can use to troubleshoot and remedy this?

I have some screenshots that the students were able to take in some testing - you can access with the links below.

I tried messaging Brandon a week ago, no response. And I hit the contact us page on the limelightvision web page on the weekend and haven’t received a response.

Thanks for any support or ideas you can provide


Chris Wilson
Team 5032 | The Falcons | Lead Mentor | (He/him)

https://ibb.co/wMbPWq5

https://ibb.co/L6MzXfL

We had this happen as well - In our case the lens was knocked out of alignment with the camera sensor.

This is the hit that did it to us - it doesn’t look like much but cameras aren’t really built to withstand impacts. It’s happened multiple times since then, mostly because our limelight is in a vulnerable spot on the robot. Lesson learned, I guess.

I’ve been told that we were able to realign it manually, but I doubt the camera has the same distortion after the repair as it did beforehand. No data to support this claim either way though.

You might be able to realign it manually? Hopefully Brandon reaches out to provide some guidance here.

addendum: We reached out after MSC and Brandon replaced this limelight with a new one. We have not reached out for support w/ regards to the offseason failures.

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Thanks for the quick response and the info - hopefully we hear from Brandon soon.

Chris

We’ve had this happen from impacts where the lense jumps threads on the sensor housing, someone with the right skill set can disassemble and reassemble the limelight with the right focal length (or eye ball it with the video pulled up on a laptop) and re-glue to retain the location.

Limelight now supports calibration that the user can do if something like this happens.

Thanks

Have you got a procedure for that calibration?

I think we will wait to hear from limelight before we attempt adjusting it. Thats sounds a bit tricky.

Chris

have you tried twisting the lens to tighten it? our team had a blurry limelight until we just tightened the lens and it started working

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Limelight 2023.6 - FIRST / General Forum - Chief Delphi

Awesome - thanks! I will let you know how we end up.

Ok, so I bought a 12V POE injector and a 12V, 2A power supply and got this working off my PC. Flashed up to 2023.6 and tried the calibration.

Dont think there is any way to calibrate this back to normal - cant even resolve the smaller grids.

I guess we will try to open up and adjust the lens.

Still haven’t seen a reply from limelight or Brandon which kind of sucks.

Chris

I ended up taking it apart and adjusting the lens position relative to the sensor which wasn’t too hard. Things are improved but I’m not sure I have it all the way because the image looks very noisy.

Is anyone able to post some screenshots so I can compare the image quality?

ok, all loctited and reassembled. Image qaulity looks great again.
Best way to check it is to go to port 5802 which is the full resolution stream.

http://xx.xx.xx.xx:5802/

Thanks for the assist!
Chris

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