Welcome to ROSMASTER X3 Plus repository

7. Web page real-time monitoring

7.1. Environment Construction

#Raspberry Pi 5 master needs to enter docker first, please perform this step
#If running the script into docker fails, please refer to the ROS/07.Docker tutorial
~/run_docker.sh

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sudo apt-get install ros-melodic-async-web-server-cpp ros-melodic-web-video-server ros-melodic-usb-cam 

First make sure that the USB camera link is correct, enter the following command to check that the USB device number exists and is video0

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ll  /dev 

If the execute permission is not enough, you need to add the execute permission

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sudo chmod 777 /dev/video* 

7.2. modify the launch file

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sudo vim /opt/ros/melodic/share/usb_cam/launch/usb_cam-test.launch 

Keep hitting the keyboard [d] to delete everything. Click [i] on the keyboard to enter the edit mode, and write the following content into it.

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< launch > 
    < arg  name = "open_view"  default = "false" /> 
    < node  name = "usb_cam"  pkg = "usb_cam"  type = "usb_cam_node"  output = "screen" > 
        < param  name = "video_device"  value = "/dev/video0" /> 
        < param  name = "image_width"  value = "640" /> 
        < param  name = "image_height"  value = "480" /> 
        < param  name = "pixel_format"  value = "yuyv" /> 
        < param  name = "camera_frame_id"  value = "usb_cam" /> 
        < param  name = "io_method"  value = "mmap" /> 
    </ node > 
    <!-- web_video_server --> 
    < node  pkg = "web_video_server"  type = "web_video_server"  name = "web_video_server"  output = "screen" /> 
    <!-- image_view --
 Bind the device ID
Expansion tutorial