Program Robots Like a Boss
So, you’re starting to learn how to use your Raspberry Pi 4 board, and you may be wondering: what can you do with your Pi? What fun project can you start, and what can this project teach you so you’re progressing while building something? In this post I’ll give you some things to do with … Read more
In this tutorial you’ll learn how to properly use the delay() function to add some delay between 2 actions in your Arduino programs. Then, you will discover why using delay() is often not a good idea when you want to make your programs scale, and how to fix that. All right, let’s get started! Why … Read more
In this tutorial you will learn how to run ROS2 on multiple machines, including a Raspberry Pi 4 board. As you’ll see, things will be quite easy and there is almost no configuration to do. If you’re using a Raspberry Pi with ROS2 as one of the machines, make sure you have correctly installed ROS2 … Read more
In this tutorial I’ll show you how you can chain ROS2 topics and thus build a data pipeline through several nodes. This is a pretty common use case in robotics: you get some data from a sensor, and you need to pass it through several parts of your applications. Each part needs the data to … Read more
In this tutorial you’ll use the ros2 service command line tool to debug the services that you start from within your nodes – or nodes that already exist in your graph. As a reminder, a service has 2 sides: the server (unique), and the client (multiple clients possible). With topics, you can use ros2 topic … Read more
In this tutorial I will show you how to debug your ROS2 topics using command line tools such as ros2 topic. With a practical example, you’ll see what you can do, and what information you can find, in order to become more efficient when developing with ROS2. Code for this tutorial Let’s write a very … Read more
In this tutorial you’ll learn more about ROS2 command line tools to start and debug your nodes: ros2 run and ros2 node. I will try to remove some confusions you may have when you start, and give you practical tips you can use to improve your efficiency when developing with ROS2. Let’s get to it! … Read more
In this tutorial you’ll learn how to use ROS2 bags, with the ros2 bag command line tool, in order to save and replay data from your ROS2 topics. Why and when to use ROS2 bags? Imagine you’re working on your real – physical – robot, and you are developing an obstacle algorithm for the robot. … Read more
In ROS2, when you create a package you have to select a build type: either ament_cmake or ament_python. This will determine whether your package is a Cpp package, or a Python package. But… How to do if you want to create a ROS2 package containing both Python nodes and Cpp nodes? Good news for you: … Read more
In this tutorial I’ll show you a ROS2 launch file example and we’ll build it step by step. When you start to have a few nodes in your ROS2 application, it quickly becomes not-so-practical to start each node – with its own configuration – manually in a different terminal. With a launch file you can … Read more