Are you sure that your RPlidar model is a3 and that the serial_baudrate in your launch file is 256000? If you have model a2, then run rplidar.launch launch file, where serial_baudrate param is equal 115200:
roslaunch rplidar_ros rplidar.launch
Please, let me know about it. If you have any questions/troubles, do not hesitate to ask.
I’ve been using setting for a3 lidar with serial_baudrate=256000 for a while before the suddenly fail.
I will try to see if rplidar.launch works. At the same time, should I also try to update the rplidar_ros pakcage as @ Laschoking mentioned above (I am now wokring in ROS Melodic)?
Hi,
My initial guess is that sensitive mode may be causing some problems. Have you tried running in standard mode? Please, try to use this parameter in your launch file:
I tried the Standard mode as your suggested, but still no reponse to rostopic echo /scan.
After that, I tried to open the top cover to see if any cable connection broke. Then I got failure every time I launched rplidar_a3.launch even I closed the top cover back. Here is the log:
... logging to /home/husarion/.ros/log/1ee9796c-f5ba-11ec-9ca6-000c297f8939/roslaunch-husarion-4910.log
Checking log directory for disk usage. This may take a while.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.
started roslaunch server http://192.168.28.135:38911/
SUMMARY
========
PARAMETERS
* /rosdistro: melodic
* /rosversion: 1.14.10
* /rplidarNode/angle_compensate: True
* /rplidarNode/frame_id: laser
* /rplidarNode/inverted: False
* /rplidarNode/scan_mode: Standard
* /rplidarNode/serial_baudrate: 256000
* /rplidarNode/serial_port: /dev/ttyUSB0
NODES
/
rplidarNode (rplidar_ros/rplidarNode)
ROS_MASTER_URI=http://192.168.28.239:11311
process[rplidarNode-1]: started with pid [5131]
[ INFO] [1656295172.582627714]: RPLIDAR running on ROS package rplidar_ros, SDK Version:2.0.0
[ERROR] [1656295176.646174212]: Error, operation time out. RESULT_OPERATION_TIMEOUT!
[rplidarNode-1] process has died [pid 5131, exit code 255, cmd /home/husarion/husarion_ws/devel/lib/rplidar_ros/rplidarNode __name:=rplidarNode __log:=/home/husarion/.ros/log/1ee9796c-f5ba-11ec-9ca6-000c297f8939/rplidarNode-1.log].
log file: /home/husarion/.ros/log/1ee9796c-f5ba-11ec-9ca6-000c297f8939/rplidarNode-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete
done
I doubt if there is any problem in the connection from the lidar to the mainboard? Is there any way to make a check?
Please note that unauthorized opening of the robot case may result in loss of warranty.
To make sure it is not a software problem, please upload the latest Ubuntu image. If this does not help, please make sure the USB cable is working. If this does not help, it may be a hardware failure and you will need to replace your RPlidar.
