I want to recover the data of a thermal camera that is connected to a Raspberry PI 3 by USB. And then to send this data by ethernet to another computer. Has anyone any idea of how to proceed ?
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You start by looking at the instruction manual or datasheet for your specific camera to find out what sort of data transfer is supported over the USB connection and whether the supplier has provided an API to make that transfer possible.
Simply plugging the camera into an RPi board running the RasPiOS OS and looking at the output from lsusb and dmesg may be informative.
Then you can start searching for other people's implementations, or begin designing/coding your own.
Once you have retrieved the data transferring it over an IP network will be relatively simple.
The camera is an Optris PI.
Following the link to the software page:The thermal imaging cameras are connected to a PC via USB and they are immediately ready to be used. Temperature data is displayed through the license-free analysis software optris PIX Connect
Usually when a supplier casually mentions 'linux' they will often mean a version running on 'WinTel'/x86 PC hardware. But I would recommend asking the supplier directly for advice. firstname.lastname@example.orgThe software optris PIX Connect is compatible with all netbooks, notebooks and PC systems via Windows 7, 8 and 10 as well as Linux (ubuntu, via Direct-SDK).