Error, cannot retrieve YDLidar health code: ffffffff

[qwqwe121]

When i launch ydlidar x4-pro, I get this error, Can i know how to solve it?

[srujanpanuganti]

I'm having the same issue when I'm using with Raspberry Pi 4. Works fine on PC

[srujanpanuganti]

@qwqwe121 if you are using the lidar with a device like Raspberry Pi, try changing the supply USB power to the lidar. Make sure it's able to supply 5v, 1amp reliably. The lidar consumes a peak current during startup which may also be causing this health check issue

[JHPHELAN]

[ydlidar_ros2_driver_node-1] [2025-05-23 12:13:08][error] Error, cannot retrieve Lidar health code -1
[ydlidar_ros2_driver_node-1] [2025-05-23 12:13:09][error] Fail to get baseplate device information!

I doubt power is the only issue. I'm using an externally powered USB hub with a RPi5.

I've gotten similar errors in the past if the ydlidar.yaml parameter file does not indicate that the lidar is one way only.
However, I still get this error while my ydlidar.yaml states:
isSingleChannel: true

[erwin7259]

2025-05-27 18:14:10][info] SDK initializing
[2025-05-27 18:14:10][info] SDK has been initialized
[2025-05-27 18:14:10][info] SDK Version: 1.2.15
[2025-05-27 18:14:10][info] Connect elapsed time 12 ms
[2025-05-27 18:14:10][info] Lidar successfully connected [/dev/ttyUSB0:128000]
[2025-05-27 18:14:12][error] Error, cannot retrieve Lidar health code -1
[2025-05-27 18:14:13][error] Fail to get baseplate device information!
[2025-05-27 18:14:13][info] Check status, Elapsed time 2532 ms
[2025-05-27 18:14:13][info] Lidar init success, Elapsed time [2545]ms
✅ LiDAR erkannt!
[2025-05-27 18:14:18][error] Failed to start scan mode -1
❌ Scanstart fehlgeschlagen.

[erwin7259]

Selbes Problem mit Raspberry Pi 4B und YDLidar X4Pro

[JHPHELAN]

https://raw.githubusercontent.com/slowrunner/ROS2-GoPiGo3/main/ros2ws/src/ydlidar_ros2_driver/src/ydlidar_ros2_driver_node.cpp
Move ydlidar_ros2_driver_node.cpp to ydlidar_ros2_driver_node.ORIGINAL.cpp
Nano (edit new) ydlidar_ros2_driver_node.cpp
copy/paste above raw code into it.
Colcon build, source.
This time compiles with only few warnings and launch works ok.