What is ROS?

You want to develop robotics applications, and have discovered ROS. But you’re confused… What is ROS? ROS means Robot Operating System. It’s quite hard to understand what is ROS from the beginning. Is it an operating system? A framework? What should you do with it? When I first started a few years ago, it took … Read more

How To Use a ROS Anonymous Node

First, to understand when you should use a ROS anonymous node, let’s start with the problem. So, you’ve just created a node for your infra-red sensor, it works well, and you’re happy with it. But now, your robot has 12 infra-red sensors. Knowing that a node should have a unique name, and that you can’t … Read more

What is a ROS Launch File?

What is a ROS launch file? As we did for ROS parameters, let’s first start with the problem. This post is a part of the What is ROS? series. Your robotics application is growing Let’s say you now have an application with 6 nodes and 10 parameters. When you want to start your application, you … Read more

What is a ROS Parameter?

What is a ROS parameter ? Before diving into the explanation, let’s see the problem we have here. This post is a part of the What is ROS? series. Why do you need ROS parameters ? So, you have a nice robot application with many packages and nodes inside those packages. Great! Now, you want … Read more

What is a ROS Message?

You may already have heard about ROS topics and services using ROS messages. So… What is a ROS message ? This post is a part of the What is ROS? series. ROS messages in topics and services If you haven’t read the explanations on ROS topics and ROS services yet, please read them now and … Read more

What is a ROS Service?

After learning a little bit about ROS, you now have this question in mind: what is a ROS service ? As I did for ROS topics, let’s start with a real life analogy. I will use an analogy with a weather service online. The analogy may not be 100% accurate but the point is to … Read more

What is a ROS Topic?

You are starting with ROS and are wondering: what is a ROS topic ? To explain what is a ROS topic, I will use here a different approach from what you can already find on the Internet. Instead of giving you a bunch of code to write and run, I will use a real life … Read more

What is a ROS Node?

As you start to learn ROS, you’ve quickly discovered that everything in ROS is made with components called nodes. So, what is a ROS node ? In this post I’ll explain you the concept and the “why” behind ROS nodes. It’s important to know why you need them before you actually use them for real. … Read more