Introducing Limelight 4

FIRST General Forum
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Introducing Limelight 4

Limelight 4 is an all-new smart camera for FRC. It is powered by the Raspberry Pi CM5, and it’s twice as powerful as Limelight 3G out of the box. This is our biggest leap in performance yet, and it doesn’t stop there.

Features:

  • Upgraded Power Stage
    • Buck-Boost DC-DC Converter
    • Input Voltage Range: 3.3V - 24V / 6S (35V absolute maximum)
    • Enhanced Transient Suppression
    • Removed POE Support
  • Built-in IMU for MegaTag localization
    • Selected for low-noise and high-sensitivity
  • OV9281 Global Shutter Monochrome Sensor
  • IMX462 Back-Illuminated Color Sensor Kit (Coming soon)
  • Hailo-8 accelerator support (26 TOPS) - not included
  • Hailo-8 YoloV8 object detection at 80FPS
  • Hailo-Accelerated AprilTag Localization (2x-3x faster than CPU AprilTag localization)
  • Hailo-Accelerated CLIP Zero-Shot Classification
  • 20FPS MobileNet CPU Object Detection

Also, we’re partnering with Hailo to bring Hailo-8 to FRC. For a limited time, Hailo is offering discounted pricing on the Hailo-8 M.2 A+E module for FIRST teams / educational purposes. We are extremely impressed with Hailo-8’s performance, and we are nowhere close to getting as much as we can out of it. In all of our pipelines, Hailo-8 is far from the limiting factor in terms of performance.

Limelight 4 is currently being demoed in the Hailo suite at CES. Our partnerships with both Hailo and Raspberry Pi are helping us expand into new markets and scale as a company.

Limelight at Hailos CES suite
Limelight at Hailos CES suite720×540 43.9 KB

We will have more performance comparisons and data to show before taking orders when we release Limelight OS 2025.0 on the 15th.

Limelight 4 will launch at a price of $439, and the Hailo-8 upgrade kit will launch at a price of $165.

LL4_POSTED
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Thanks everyone!

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What sensor specifically so we can look up the spec sheet?

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What was the reason for this? I feel like this was a missed opportunity with the new radio’s POE distribution capabilities.

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Will Limelight be providing product/customer support this season for the Limelight 4?

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Do you plan to or have an ETA of when the 3/3G will be back in stock?

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Doesn’t this break R301? As there is only one configuration with the upgrade kit that pushes it over $600?

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It definitely borders on a loophole.

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Now that’s surreal. FRC vendor at CES is pretty wild. As usual, beautifully done video

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but that configuration is not strictly necessary, right?

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I actually like this. The radio PoE distro feels like a mistake; it allows you to create a network of things to blow the radio fuse and leave you dead on the field.

That said, I suspect it was done for gigabit ethernet.

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I liked POE cause it allowed you to run power with a Ethernet cable, hence the name POE. But now, teams will need to run a additional power wires with the Ethernet cable.

I am also worried that teams won’t see the message that POE has been removed and will try to power the Limelight 4 with POE since all previous Limelights supported POE.

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That looks impressive! Which depth estimation model was used in the video?

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Does it?
the only use of the upgrade is for the limelight, and only way is the over $600 configuration. Is there other uses for the upgrade?

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Under R301, there is a clause that states this:
“If a COTS item is part of a modular system that can be assembled in several
possible configurations, then each individual module must fit within the price
constraints defined in this rule.
If the modules are designed to assemble into a single configuration, and the
assembly is functional in only that configuration, then the total cost of the
complete assembly including all modules must fit within the price constraints
defined in this rule.”
Technically it’s functional with only the camera, so not illegal? Idk I don’t sell cameras

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Agreed, it’s definitely sold as very optional add on. Plus the module has uses outside of the camera (or at least I assume so based on its name)

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To be clear: in a world where the radio didn’t distribute PoE, it was convenient to be able to run one cable to a Limelight. But in a world where every robot has a PoE-distributing radio, it aligns to create a failure mode down the line. The radio is a done deal at this point.

With proper ethernet magnetics, PoE shouldn’t damage the Limelight; it just won’t provide power. Hopefully, that’s what’s inside.

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The AI Accelerator board is not custom to the Limelight, so it could be used outside of the LL4 on other supported devices

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Is this already out of stock? I went to westcoast website and it says out of stock. that’s kind of sad if its out of stock this fast.

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Bro who does these videos, they’re wild

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