i am trying to connect Arduino Uno Q to a webcam, but am also always getting this
======== App is starting ============================
2026-06-20 09:46:10.237 INFO - [MainThread] VideoObjectDetection: [VideoObjectDetection] Host: ei-video-obj-detection-runner - URL: ws://ei-video-obj-detection-runner:4912
2026-06-20 09:46:10.255 INFO - [WebUI.execute] WebUI: The application interface is available here:
- Local URL: http://localhost:7000
- Network URL: http://192.168.0.105:7000
2026-06-20 09:46:10.257 INFO - [MainThread] V4LCamera: Starting camera...
2026-06-20 09:46:10.447 WARNING - [MainThread] V4LCamera: Camera usb:HD camera : HD camera FPS set to 25 instead of requested 10
2026-06-20 09:46:10.699 ERROR - [MainThread] V4LCamera: Unexpected error opening camera usb:HD camera : HD camera: Read test failed for camera usb:HD camera : HD camera
[ WARN:0@1.185] global cap_v4l.cpp:804 requestBuffers VIDEOIO(V4L2:/dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0): failed VIDIOC_REQBUFS: errno=19 (No such device)
2026-06-20 09:46:10.703 WARNING - [MainThread] V4LCamera: Failed attempt 1/10 at starting camera usb:HD camera : HD camera: Read test failed for camera usb:HD camera : HD camera. Retrying in 1.0s...
2026-06-20 09:46:11.704 WARNING - [MainThread] V4LCamera: Failed attempt 2/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 2.0s...
2026-06-20 09:46:13.705 WARNING - [MainThread] V4LCamera: Failed attempt 3/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 4.0s...
2026-06-20 09:46:17.706 WARNING - [MainThread] V4LCamera: Failed attempt 4/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 8.0s...
2026-06-20 09:46:25.707 WARNING - [MainThread] V4LCamera: Failed attempt 5/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 16.0s...
2026-06-20 09:46:41.708 WARNING - [MainThread] V4LCamera: Failed attempt 6/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 32.0s...
2026-06-20 09:47:13.709 WARNING - [MainThread] V4LCamera: Failed attempt 7/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 60.0s...
2026-06-20 09:48:13.710 WARNING - [MainThread] V4LCamera: Failed attempt 8/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 60.0s...
2026-06-20 09:49:13.711 WARNING - [MainThread] V4LCamera: Failed attempt 9/10 at starting camera usb:HD camera : HD camera: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0. Retrying in 60.0s...
2026-06-20 09:50:13.712 ERROR - [MainThread] App: Failed to start brick 'VideoObjectDetection': Failed to start camera usb:HD camera : HD camera after 10 attempts, last error is: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0
Traceback (most recent call last):
File "/usr/local/lib/python3.13/site-packages/arduino/app_peripherals/camera/base_camera.py", line 94, in start
self._open_camera()
~~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.13/site-packages/arduino/app_peripherals/camera/v4l_camera.py", line 194, in _open_camera
raise RuntimeError(f"No device found at {self.v4l_path}")
RuntimeError: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.13/site-packages/arduino/app_utils/app.py", line 187, in _start
brick.start()
~~~~~~~~~~~^^
File "/usr/local/lib/python3.13/site-packages/arduino/app_bricks/video_objectdetection/__init__.py", line 136, in start
self._camera.start()
~~~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.13/site-packages/arduino/app_peripherals/camera/base_camera.py", line 106, in start
raise CameraOpenError(
f"Failed to start camera {self.name} after {self.first_connection_max_retries} attempts, last error is: {e}"
)
arduino.app_peripherals.camera.errors.CameraOpenError: Failed to start camera usb:HD camera : HD camera after 10 attempts, last error is: No device found at /dev/v4l/by-id/usb-Generic_HD_camera_20181212000000-video-index0
2026-06-20 09:50:13.736 INFO - [MainThread] App: App started
currently i am running Detect Objects on Camera from app lab
my setup is
12 V power supply -> uno Q vin pin
|
12 v power supply -> 5v setdown -> usb hub PD - > both camera and uno Q is connected
at this point i am just confused is camea the problem or hub or UNO Q is the problem
can any one tell me how to fix this
these are my
i have this camera
(Zebronics Zeb-Crystal Clear Web Camera 0.3 MP USB)
with this hub