Raspberry pi to Duet3 - connecting camera
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I am setting up a Raspberry 3B+ to run the Duet3 main board.
Can the camera port on the 3B+ be used to stream video of the build plate or will that over-tax the SBC?
Is it possible to use any pins on the SBC that aren't used by the Duet to run pi controlled relays?To lump both of the above questions together, is the SBC meant to only run the Duet or can I run other processes that one would normally run on a pi?
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the 3B+ is a bit weak compared to the Pi4, but should still be able to handle a few extra processes. Streaming a camera to the DWC view should be ok but may depend on what quality and frame rate you're wanting to use. And controlling a few GPIO pins should be fine.
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@phaedrux, thank you !
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I use a 3B+ (not controlling the Duet). It handles multiple functions quite well. Some camera software can put a heavy load on the Pi. As a result I created (and just released) this:
https://forum.duet3d.com/topic/23759/videostreamerMay be useful to you.
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@stuartofmt, very cool, I will give it a try. Thanks!
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@stuartofmt, could you double check the wget link that is shown in the readme file?
wget https://github.com/stuartofmt/VideoStreamer/raw/master/VideoStreamer.py
It is not working for me.
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Done - It should have been:
wget https://github.com/stuartofmt/VideoStreamer/blob/master/videostream.py
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@stuartofmt, I can now do the wget. Note that the documentation also refers to VideoStreamer instead of videostream (note also capitalization) in many places.
When I run videostream.py I get a syntax error on line 7. -
@jens55 said in Raspberry pi to Duet3 - connecting camera:
@stuartofmt, I can now do the wget. Note that the documentation also refers to VideoStreamer instead of videostream (note also capitalization) in many places.
When I run videostream.py I get a syntax error on line 7.Sorry - this was entirely my fault - I was running on auto-pilot.
The original url for downloading was correct ! The changed url is causing the syntax error.
So now the question is why couldn't WE download. It failed for me a while ago but when I just checked again - it worked fine. May have been something at the github end.Try it again - should be all good.
In any case - I have renamed everything (including the github to videostream as I was confusing myself with the two variations on wording :-).
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@stuartofmt, the original link now works with the changed file name but I still get the error.
Now to be sure, this could be entirely my issue since I did not load any of the dependencies that you mentioned. However, the issue doesn't look like it is caused by dependencies .....!
Screenshot from 2021-06-21 14-29-51.png -
@jens55 said in Raspberry pi to Duet3 - connecting camera:
@stuartofmt, the original link now works with the changed file name but I still get the error.
The error is the same as before - likely you are using the .../blob/... form - which gives the html ....
Make sure you remove the old videostream.py file first or try this explicit download .. . note that the names were changed and the use of ../raw/..
wget https://github.com/stuartofmt/videostream/raw/master/videostream.py -O videostream.py
The dependency errors look very different ,,,,,,
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@stuartofmt, my bad, the second download added a '.1' instead of overwriting the initial download.
I got further but then ran into dependencies. I attempted to install everything you listed but some dependencies did not load (not found) .
The error is now a dependency error re module 'imutils' -
I found the following to be the simplest guide for getting basic webcam streaming working on the PI running DuetPI.
I just use the example start script in the pi users crontab to start it a boot. Set the URL in DWC.
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@nurgelrot said in Raspberry pi to Duet3 - connecting camera:
I found the following to be the simplest guide for getting basic webcam streaming working on the PI running DuetPI.
I just use the example start script in the pi users crontab to start it a boot. Set the URL in DWC.
Yes - this is one of the ones I tried and unfortunately (in my case but probably not in all) it used a lot of CPU. The program I have is generally < 2% on a Pi. But I acknowledge that miles-may-vary.
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@jens55 said in Raspberry pi to Duet3 - connecting camera:
@stuartofmt, my bad, the second download added a '.1' instead of overwriting the initial download.
I got further but then ran into dependencies. I attempted to install everything you listed but some dependencies did not load (not found) .
The error is now a dependency error re module 'imutils'Most of the dependencies can be resolved with:
python3 -m pip install [dependency name]
for example:
python3 -m pip install imutils
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procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu----- r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 7648680 76488 201236 0 0 1 0 103 12 1 5 93 0 0 0 0 0 7648796 76492 201236 0 0 0 2 2565 3624 2 4 94 0 0 1 0 0 7648756 76496 201236 0 0 0 2 2561 4425 2 6 92 0 0 0 0 0 7648632 76496 201236 0 0 0 2 2639 4011 2 6 93 0 090+% idle while printing. I don't think al little CPU usage is a big deal. If you're not using the the CPU you may as well not have it.
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@stuartofmt, thanks - that worked
I will have to set up a camera on my test computer and see how it goes. -
@nurgelrot said in Raspberry pi to Duet3 - connecting camera:
I don't think al little CPU usage is a big deal. If you're not using the the CPU you may as well not have it.
I agree. When I said "a lot" - I was referring to situations where the camera software was consuming > 70% CPU. This, for some mysterious reason(s) that do not affect all users / installs. In my case - I could not track it down
In any case - we have choices. A good thing.
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@jens55 said in Raspberry pi to Duet3 - connecting camera:
@stuartofmt, thanks - that worked
I will have to set up a camera on my test computer and see how it goes.FYI - I have posted a new version with better detection of available camera capabilities. Just need to download and use the new videostream.py file
