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OpenAgricultureFoundation / openag_brain

ROS package for controlling an OpenAg food computer
GNU General Public License v3.0
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Get cameras working (ros usb_cam) #210

Open gordonbrander opened 7 years ago

gordonbrander commented 7 years ago

Requires vendoring (or otherwise installing) usb_cam library.

Work:

A DEMO-ONLY branch is available here https://github.com/OpenAgInitiative/openag_ui/tree/wfp.

It relies on these scripts being installed in the pi's crontab https://github.com/gordonbrander/pi_image_server

(Exported from Trello https://trello.com/c/xKLxM1fb/916-get-cameras-working-ros-usb-cam)

rwdavis513 commented 7 years ago

Camera is switching ports going from /dev/video0 to /dev/video1. Unclear what is causing the switch, there could be other issues with usb_cam as well.

ghost commented 7 years ago

Ideas:

  1. Does the problem go away if you connect the cameras through a powered hub?
  2. What's the amperage of the power supply you're running the Pi on, how much load is on it besides the Pi (any motors?), what are the current requirements for the cameras? How does the power supply's current rating compare to the sum of worst-case loads?
  3. What do you see if you look in /var/log/* about usb and usb cameras? When I was messing around with a Logitech webcam--prior to getting totally fed up with it--it seemed to be connecting and disconnecting at the usb level a lot. I read some stuff about the kernel UVC drivers relying on reseting usb devices as a way of dealing with flakey camera firmware.