Hardware Reference
In-Depth Information
Type the following command to disable the overlay window again:
pi@raspberrypi ~ $ v4l2-ctl --overlay=0
6.
For optimal use in stealthy situations you may also want to consider
disabling the red LED to avoid leading any intruders straight to the camera.
Open up
/boot/config.txt
for editing:
pi@raspberrypi ~ $ sudo nano /boot/config.txt
Make a new line and add the following configuration directive, then reboot:
disable_camera_led=1
7. Your camera module is now ready to be used with MJPG-streamer! Keep
in mind that while the camera module is capable of recording video with a
resolution of 1920 x 1080 pixels at 30 fps, you'll want to set it much lower for
reliable streaming across the network. Start with a low resolution of 640 x 480
and work your way up.
Knowing your USB webcam
Let's see what we can find out about the detection of your webcam, using the
following command:
pi@raspberrypi ~ $ dmesg
The
dmesg
command is used to get a list of all the kernel information messages that
have been recorded since we booted up the Pi. What we're looking for in the heap of
messages is a notice from the
uvcvideo
module.
Kernel messages indicating a found webcam
In the previous screenshot, a Logitech C110 webcam was detected and registered
with the
uvcvideo
module. Note the cryptic sequence of characters,
046d:0829
, next
to the model name. This is the device ID of the webcam, and can be a big help if you
need to search for information related to your specific model.
