This is a ROS node for SF30 rangefinders*
(*It also works for SF02. In this case, set parameter SF02 to true. It is probably compatible with other models: SF10, SF11 - not tested!)
The node assume the following setup for the laser (I used the Lightware terminal from the manufacturer):
#!term 1: Active data port USB distance in m 2: Resolution 0.03 m 3: Serial port update rate 1000 / sec (actual = 1665 / sec) 4: Serial port baud rate 115200 5: Analog port update rate 1 / sec (actual = 1 / sec) 6: Analog maximum range 256 m 7: Alarm activation distance 17.50 m 8: Alarm latch Off 9: USB port update rate 50 / sec (actual = 50 / sec)
Before you leave the terminal, make sure the sensor is sending messages of the form (hit space to make it happen):
#!term 0.57 m 0.57 m 0.59 m 0.57 m 0.59 m 0.59 m 0.55 m 0.59 m 0.57 m 0.57 m 0.57 m
To install the package:
Create a catkin workspace. For instructions on how to create the workspace go here. Download and compile the package:
#!bash cd catkin_ws/src git clone email@example.com:castacks/sf30_node.git cd .. catkin_make
To run the node:
In a terminal run:
#!bash source devel/setup.bash roslaunch sf30_node sf30.launch
There are a number of parameters in
sf30.launch that control the behavior of this driver. Please read these carefully and modify as needed.
portname: name of the serial port the SF30 is connected on. Defaults to
topic_name: name of topic to publish to, default is
frame_id: name of the frame used when publishing message.
true, the range will be published as a
false, the message will be of type
sensor_msgs::LaserScan. When published as a
LaserScan, the intensities field on this message means data confidence. It is
1 if we can trust the given range. Defaults to
debug: print debug information when
update_rate: update rate of node. Defaults to 50Hz.
altitude_variance: variance to use when publishing range as a pose. Default is .09.
sf02: works with legacy versions of the sensor (the sensor output has a space before the reading).
Who do I talk to?
- Guilherme Pereira - firstname.lastname@example.org
The laser sensor uses an internal FTDI serial-to-USB converter. Therefore, your Linux system must provide support for this device. Most of distributions come with this support but some embedded distributions need to be set. Here is a good tutorial on how to set the FTDI support on Jetson TK1 systems. It was tested on the DJI's Manifold.
Some embedded Linux distributions suspend their inactive USB ports to save power. This may cause the sensor to stop working after the first use. Here is how to disable the auto-suspend function to prevent problems.
FTDI devices create a file in the folder
/dev/serial/by-id/that can be used as a unique identifier for the device. To use this identifier, replace the parameter
portnamein the file
/dev/serial/by-id/ID_OF_YOUR_DEVICE. This is very useful when several devices are connected to the same computer.
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