omnidirectional unit

Weekend Project: Mecanum Wheel Unit CAD

This weekend I’ve worked on a CAD Model for my new omnidirectional robot. This model has been created using Autodesk Inventor in the student version which is quite a good tool for modeling and simulating projects. I can warmly recommend this tool to anyone who wants to verify an idea or just wants to make a CAD Model which got to be 3d printed later on. The CAD-Model includes a full working gear with a gear ratio of 1 to 2 which will be printed next week using an Ultimaker 3d printer.
For this project, I gonna use Mecanum Wheels from VEX Robotics. They were quite expensive but seems to provide a satisfactory quality for my project. Nearly half of the price was for the shipping to Germany. When I ordered them some weeks ago, I had no access to a 3D printer to print them myself, next time I will try to print the mecanum wheels on my own (not the Vex design) to avoid the shipping costs (if I do so, I will put my design online).
The wheel is powered by a Nema17 stepper motor. A stepper driver circuit (L298N Dual H Bridge) is mounted on the backside of the gear. The cover of the gear is switched to invisible in the article picture to give you a better view at the gear.


RaspberryPi: Autoconnect to WLAN (WPA2)

In most applications in robotic it’s necessary to get rid of the ethernet cable to move the raspberry free and battery powered. Luckily the Raspberry PI supports a variety of USB-WLAN-Sticks like the TP-Link TL-WN821N. In this tutorial I describe how you setup the WLAN connection that the RPi auto connects to your WLAN after you switch on the power.
Continue reading…

HowTo setup the RaspberryPI as webcam server

  1. Update your Raspberry Pi
    sudo apt-get update
  2. Install motion package
    sudo apt-get install motion
  3. Edit the Motion Config file
    sudo nano /etc/motion/motion.conf
    • daemon on
    • webcam_localhost off
  4. Start motion
    sudo motion -n
  5. The stream is available under