{"id":9292,"date":"2017-03-01T08:00:12","date_gmt":"2017-02-28T23:00:12","guid":{"rendered":"http:\/\/www.lp-research.com\/?p=9292"},"modified":"2021-04-26T22:52:38","modified_gmt":"2021-04-26T13:52:38","slug":"ros-and-lp-research-imus-simple","status":"publish","type":"post","link":"https:\/\/www.lp-research.com\/ja\/ros-and-lp-research-imus-simple\/","title":{"rendered":"Robot Operating System and LP-Research IMUs? Simple!"},"content":{"rendered":"
NOTE: We have released a new version of our ROS \/ ROS 2 driver, please refer to this post<\/u><\/font><\/a>.<\/font><\/div>\n

<\/br><\/p>\n

Introduction<\/h3>\n

Robot Operating System<\/u><\/a> (ROS) is a tool commonly used in the robotics community to pass data between various subsystems of a robot setup. We at LP-Research are also using it in various projects, and it is actually very familiar to our founders from the time of their PhDs. Inertial Measurement Units are not only a standard tool in robotics, the modern MEMS devices that we are using in our LPMS product line are actually the result of robotics research. So it seemed kind of odd that an important application case for our IMUs was not covered by our LpSensor software: namely, we didn’t provide a ROS driver.\u00a0 We are very happy to tell you that such a driver exists, and we are happy that we don’t have to write it ourselves: the Larics laboratory<\/u><\/a>\u00a0at the University of Zagreb are avid users of both ROS and our LPMS-U2 sensors. So, naturally, they developed a ROS driver which they provide on their github site<\/u><\/a>.\u00a0 Recently, I had a chance to play with it, and the purpose of this blog post is to share my experiences with you, in order to get you started with ROS and LPMS sensors on your Ubuntu Linux system.<\/p>\n

Installing the LpSensor Library<\/h3>\n

Please check our download page<\/u><\/a> for the latest version of the library, at the time of this writing it is 1.3.5. I downloaded it, and then followed these steps to unpack and install it:<\/p>\n

tar xvzf ~\/Downloads\/LpSensor-1.3.5-Linux-x86-64.tar.gz\r\nsudo apt-get install libbluetooth-dev\r\nsudo dpkg -i LpSensor-1.3.5-Linux-x86-64\/liblpsensor-1.3.5-Linux.deb\r\ndpkg -L liblpsensor<\/pre>\n
I also installed libbluettoth-dev<\/tt>, because without Bluetooth support, my LPMS-B2 would be fairly useless.<\/p>\n
Setting up ROS and a catkin Work Space<\/h3>\n
If you don’t already have a working ROS installation, follow the ROS Installation Instructions<\/u><\/a> to get started. If you already have a catkin work space you can of course skip this step, and substitute your own in what follows.\u00a0 The work space is created as follows, note that you run catkin_init_workspace<\/tt> inside the src<\/tt> sub-directory of your work space.<\/p>\n
mkdir -p ~\/catkin_ws\/src\r\ncd !:2\r\ncatkin_init_workspace<\/pre>\n
Downloading and Compiling\u00a0the ROS Driver for LPMS IMUs<\/h3>\n
We can now download the driver sources from github<\/u><\/a>. It optionally makes use of and additional ROS module by the Larics laboratory which synchronizes time stamps between ROS and the IMU data stream.\u00a0 Therefore, we have to clone two git repositories to obtain all prerequisites for building the driver.<\/p>\n
cd ~\/catkin_ws\/src\r\ngit clone https:\/\/github.com\/larics\/timesync_ros.git\r\ngit clone https:\/\/github.com\/larics\/lpms_imu.git\r\n<\/pre>\n
That’s it, we are now ready to run catkin_make<\/tt> to get everything compiled and ready.\u00a0 Building was as simple as running catkin_make<\/tt>, but you should setup the ROS environment before that.\u00a0 If you haven’t, here’s how to do that:<\/p>\n
cd ~\/catkin_ws\r\nsource devel\/setup.bash\r\ncatkin_make<\/pre>\n
This should go smoothly. Time for a test.<\/p>\n
Not as Cool as LpmsControl, but Very Cool!<\/h3>\n
Now that we are set up, we can harness all of the power and flexibility of ROS. I’ll simply show you how to visualize the data using standard ROS tools without any further programming.\u00a0 You will need two virtual terminals.\u00a0 In the first start roscore<\/tt>, if you don’t have it running yet.\u00a0 In the second, we start rqt_plot<\/tt> in order to see the data from our IMU, and the lpms_imu_node<\/tt> which provides it.\u00a0 In the box you can see the command I use to connect to my IMU. You will have to replace the _sensor_model<\/tt> and _port<\/tt> strings with the values corresponding to your device.\u00a0 Maybe it’s worth pointing out that the second parameter is called _port<\/tt>, because for a USB device it would correspond to its virtual serial port (typically \/dev\/ttyUSB0<\/tt>).<\/p>\n
rosrun rqt_plot rqt_plot & # WordPress sometimes (but not always!) inserts \"amp;\" after the ampersand, if you see it, please ignore it.\r\nrosrun lpms_imu lpms_imu_node _sensor_model:=\"DEVICE_LPMS_B2\" _port:=\"00:04:3E:9E:00:8B\"<\/pre>\n
Once you enter these commands, you will then see the familiar startup messages of LpSensor as in the screenshot below. As you can see the driver connected to my LPMS-B2 IMU right away. If you cannot connect, maybe Bluetooth is turned off or you didn’t enter the information needed to connect to your IMU.\u00a0 Once you have verified the parameters, you can store them in your launch file or adapt the source code accordingly.<\/p>\n
\"Screenshot<\/a>
Screenshot of starting the LPMS ROS node<\/p><\/div>\n
The lpms_imu_node<\/tt> uses the standard IMU and magnetic field message types provided by ROS, and it publishes them on the imu<\/tt> topic.\u00a0 That’s all we need to actually visualize the data in realtime.\u00a0 Below you can see how easy that is in rqt_plot<\/tt>. Not as cool as LpmsControl, but still fairly cool. Can you guess how I moved my IMU?<\/p>\n
\"animation<\/a><\/p>\n
Please get in touch with us, if you have any questions, or if you found this useful for your own projects.<\/p>\n
Update:<\/em> Martin G\u00fcnther from the German Research Center for Artificial Intelligence<\/u><\/a> was kind enough to teach me how to pass ROS parameters on the command line.\u00a0 I’ve updated the post accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"
NOTE: We have released a new version of our ROS \/ ROS 2 driver, please refer to this post. Introduction Robot  […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4,45],"tags":[39,12,57,70,87,16,86,85],"class_list":["post-9292","post","type-post","status-publish","format-standard","hentry","category-blog","category-use-cases","tag-imu","tag-lpms","tag-lpms-b","tag-lpms-u","tag-lpsensor","tag-open-source","tag-robot-operating-system","tag-ros"],"yoast_head":"\nRobot Operating System and LP-Research IMUs? 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