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  • Sharing Thermal Images of my OAK-D-Lite

Hi,

I just successfully made the depthai_demo.py run on my Win10 machine, using the command-line installation instruction. The window installer had some bugs, the depthai_demo failed to run.

The camera ran very fast, COLOR FPS and NN FPS were around 27-29. After 5 mins, the camera got warm and its heatsink became very hot after 15 mins. It took some photos with my thermoscan (the P2 InfiRay).

Front

Back

The heatsink was around 56 Celsius, corresponding to the documentation.

Power consumption
Standby: 0.6 W
Running depthai_demo.py: 4 W
Max consumption: 4.5 W

Operating temperature
(after 90 minutes)
Enclosure: 56.3 °C
MyriadX: 73.53 °C

BTW, the USB 3 can supply 4.5w of power (or 0.9A) max. I found that connecting the OAK-D-Lite through a cheap usb3 hub caused it to run at the low usb speed, reducing the fps a lot.

Cheers,

  • erik replied to this.

    Hi redbook ,
    Thanks for sharing! So if I understand correctly, our measurements matched your results as well? Regarding chea pUSB3 hub - I assume USB3 doesn't work, so it's using USB2 mode, which has 10x lower bandwidth and is the cause for reducing the fps. Thoughts?
    Thanks, Erik

        Also, could we use your images for ours docs (at thermal paragraph)? I think it would be useful🙂

          erik More than welcome, Erik.

          Never realized a real VPU would run at this hot 😅

            erik I just tested my USB3 extension cable and the cheap USB3 hub with my Orico 50-cm USB3 cable.
            Copy a large file onto my M2 SSD USB-C enclosure.

            1) USB3 extension cable > USB3 cable > SSD : 267 MB/s (throughput)
            2) USB3 extension cable > cheap USB3 hub > USB3 cable > SSD : 30 MB/s

            3) USB3 extension cable > USB2 cable > SSD : 23 MB/s
            4) USB3 extension cable > cheap USB3 hub > USB2 cable > SSD : 23 MB/s

            From the experimental results, I'm not sure whether the cheap USB3 hub runs at the USB2 speed or which standard.

            PS I tested 2 USB2 cables from UGREEN and Sony and got similar results.

                Hi redbook , thanks, uploading these now to docs🙂

                You can check what USB mode is being used with print('usb speed:',device.getUsbSpeed()) (SUPER==USB3, HIGH==USB2).
                Thnaks, Erik