RPLiDar Raspberry Pi 4

https://linuxize.com/post/install-java-on-raspberry-pi/

http://wiki.ros.org/kinetic

https://medium.com/robotics-with-ros/installing-the-rplidar-lidar-sensor-on-the-raspberry-pi-32047cde9588

http://wiki.ros.org/rviz

https://www.hackster.io/shahizat005/getting-started-with-ros-melodic-on-raspberry-pi-4-model-b-cbdec8