• Part 1: Mechanical Design Basics.
• Part 2: Balancing the Elevator.
• Part 3 (current): Electronics (optocoupler, H-Bridge, and more).
• Part 4: Software to control the Arduino.

In the first two parts of this series, we have introduced the mechanics of our Lego-based elevator and we discussed how to balance it to lift some load. Today, we will be discussing the connection between the Lego Mindstorms' motor and touch sensors with an Arduino board. Lego Components Characteristics First things first, ...
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Wanna learn how to make mobile robots? This free online course entitled “Control of Mobile Robots” is for you (see Video 1). The tutor is Dr. Magnus Egerstedt, a Professor in Georgia Tech’s School of Electrical and Computer Engineering. For 7 weeks, he will be introducing concepts from control theory, and how to map them onto an actual physical platform. In addition, an introduction into microcontrollers, mechatronics, and electronics will be given so that, by the end of the course, ...
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Wana play a trick to your friends? Use SkyJack a software that takes over the control software of AR Drones. It analyzes raw Wifi data packets to perform the drone hijacking. The video below by Samy Kamkar gives more details about how it works. The code is freely downloadable from GitHub. Hope that Amazon and UPS will take this as a serious warning and address security issues before launching commercial drone applications. ...
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• Part 1: Mechanical Design Basics.
• Part 2 (current): Balancing the Elevator.
• Part 3: Electronics (optocoupler, H-Bridge, and more).
• Part 4: Software to control the Arduino.

In the first part of this series, we introduced the core structure of our elevator. But, we aren’t done yet with the mechanics. As shown in Video 1, our initial design was unbalanced. It isn’t usable at all to lift any weight, such as a smartphone. The solution is to lower and move ...
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• Part 1 (current): Mechanical Design Basics.
• Part 2: Balancing the Elevator.
• Part 3: Electronics (optocoupler, H-Bridge, and more)
• Part 4: Software to control the Arduino

Recently, we scavenged an old Lego Mindstorms 1.5 set. It’s fully functional, but the RCX 1.5 Lego software is obsolete and does not run on recent Operating Systems. Besides, the brick has only few in/out ports: 3 inputs and 3 outputs. So, we decided to forget it and reuse Lego parts with an ...
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It is no scoop that Smartphones are attractive for robotics. They gather in a small case a display, wireless for communication, computing capabilities, and a bunch of sensors. That’s cool! But, you might be using a secondhand device, and you don't know what sensors are available, or you may want to check if any is broken. Besides, some sensors are software-based, and thus may be there or not depending on the Android version you are running. This is why we ...
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In this tutorial, we will be talking about ROS namespaces which allow to combine nodes in ways unplanned by developers. This is actually what all ROS is about: allow building systems by connecting nodes, often developed by third parties according to your needs. This is possible thanks to a flexible node naming system. As usual, we will illustrate presented concepts with concrete examples that you can run on your own machine. As a prerequisite, you only need to be familiar ...
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The idea of using a robotic dock for iPhone and iPod is not new. Back in 2009, a robot hobbyist has developed a humanoid robot named Robochan which head was an iPhone 3GS (see Video 1). The iPhone acted as a screen that displays different facial expressions. It also plays the role of the robot controller and provided some fun features such as a robotic alarm clock. The robot then can wake the user up Video 1: Robochan humanoid robot ...
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UPDATE: You might want to use a more recent version of ROS: Hydro Medusa (released on September 2013). See the corresponding post: Virtual Machine with ROS Hydro Medusa Pre-Installed. Install procedure unchanged. ROS Groovy was released on December the 31st, 2012. For those of you who just want to quickly experiment with it, we provide a ready to use virtual machine. It features ROS Groovy Galapagos installed on Ubunutu 12.04.1 LTS (Precise). The ROS Groovy virtual machine comes in a ...
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Many newcomers to ROS don’t know where to start. Indeed, ROS is not an application, but it is rather a robotics middleware. That is an infrastructure to run robotic software. It provides plenty of tools, libraries and packages to ease developing, managing and reusing code. In this post, we’ll go quickly through the main concepts and illustrate them using a simple example. If you want to experiment by yourself, all you need is the Fuerte version of ROS. You can ...
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