Make a Raspberry Pi 4 program start on boot

Let’s say you have developed a super program running on your Raspberry Pi 4 board. But here’s the problem: to start it you always have to power on the board, log in (with a screen and keyboard or via ssh), and start your program. How could you make your Raspberry Pi 4 program start on … Read more

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

The Arduino Language in 10 Points

Programming on Arduino is definitely not the same thing as programming on a standard computer. So, what exactly is the Arduino language? It seems like you’re programming in C/C++, but soon you realize that it’s not exactly C/C++. You don’t really know what you can do, and what you can’t do. In this post I’ll … 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 are Real-Time Constraints in Robotics?

Real-time constraints in robotics is often a difficult-to-understand subject at first. What does real-time really mean? Most robotic systems are subject to real-time constraints. Not respecting those constraints when developing a robot, or a robotic application, might result in different kinds of issues. In the worst case, the application will completely fail to perform correctly. … 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

Arduino Uno Pins – A Complete Practical Guide

The Arduino Uno board has over 20 pins that you can use for many different applications. In this post I’ll give you a complete and practical overview of the main Arduino Uno pins. If you’re starting with Arduino, or if you’re already a software developer and want to learn more about the bridge between software … 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. Update: ROS2 is now up and ready! Get a complete explanation for ROS2 parameters with this free mini-course. Why do you need ROS parameters ? So, … 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

How To Save Values On Arduino With EEPROM

Inside your computer, you have one or several hard drive to store all your data. But what about an Arduino board ? How can you save values directly on the Arduino board without an external storage device ? Here comes the EEPROM memory. What is the EEPROM memory ? The EEPROM memory allows you to … Read more