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Using ssh, edit the hosts file so that the EV3 brick can communicate with the other nodes using their name. It was automatically allocated by your router in step 2

Change the IP address of the EV3 brick in the 'extra_hosts' section.

Change the IP address of the master node in the same was as above.

If by any chance you already have other devices with the same address you will need to change them to an unused IP to avoid clashes.

You can see that the robot node and teleop nodes have a fixed IP address.

If your router's IP is different from mine, replace everything starting with 192.168.0 with your router's prefix address, for instance 192.168.1.

Now change the ip addresses according to your router's settings: More information on topics and Twist here. It will allow us to send 'Twist' messages using the keyboard.

a container named 'teleop' which runs the teleop node.

You can find more information about their meaning here: and here:

Feel free to inspect these files and the associated config file. There is one launch file for the motors and one for the infrared controller. The launch files declare nodes that will communicate with the 'ev3_manager' program on the EV3 brick.

a container named 'robot', which runs the launch files for the robot.

a container named 'master', which runs roscore.

On my Ubuntu laptop it is enp0s25, but it might be different on your platform. You might need to change the name of the ethernet interface. Most wifi cards are incompatible with macvlan because they cannot be put in promiscuous mode. For this to work you have to use an ethernet cable to connect to your router. It uses macvlan to make the containers look as is if they were separate machines on the local network. This file describes the docker containers and network that we are going to start:

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This will save a lot of time, and you will be able to tweak the Dockerfiles (a kind of recipe that lists all the instructions) to suit your needs.ġ) On your computer, clone or download my github repository:Ģ) Edit rosev3/gripp3r/docker-compose.yml

#Ev3 box robot bricksmith mac os#

You can install docker on your Windows, Mac OS or Linux PC, and you will then be able to run the docker containers that I prepared for you with all the required ROS packages. ROS runs best on Linux, but you might not want to install linux on your computer.

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This guarantees that the software will always run the same, regardless of its environment. ROS is used by researchers, hobbyists and industrials.ĭocker containers wrap a piece of software in a complete filesystem that contains everything needed to run: code, runtime, system tools, system libraries – anything that can be installed on a server. It provides the services you would expect from an operating system, including hardware abstraction, low-level device control, implementation of commonly-used functionality, message-passing between processes, and package management. ROS is an open-source, meta-operating system for your robot. This will be the subject of other instructables. My goal it to build an autonomous robot that can fetch a ball and avoid obstables. ROS provides hundreds of packages for all kinds of robotics applications: SLAM (Simultaneous Localization And Mapping), speech, language / image recognition. This is the first step towards more impressive projects. You will also be able to view a simulation of the robot on your PC. In my next instructable you will be able to move it by clicking on a 3D map.

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Using this instructable, you will be able to remote control a Lego EV3 robot using your PC keyboard.