• 13
      Apr - 2018

      General
      1 min | 561

      #General: We are at the Hannover Fair 2018!

      General | 1 min | 561


      analytics
      digitalization
      hannover fair
      hannover messe
      industry 4.0

      I am really happy to inform you that I will be at the Hannover Fair 2018. The Institute of Mechatronic Systems will be represented by our research group "Integrated Systems and Machine Learning" in the Hall 2 on Stand B08 and we will be presenting solutions for the advancing digitization of industrial production.

      The Hannover Fair 2018 takes place between Apr 23, 2018 and Apr 27, 2018 in Hannover.

      For more info, click here:

      Hannover Fair 2018

      You find the map below:

    • 12
      Apr - 2018

      General
      1 min | 1330

      #Ubuntu 16.04 LTS: Broken SD Card Reader Support

      General | 1 min | 1330


      16.04
      bug
      kernel
      linux
      sd card readers
      ubuntu
      workaround

      I am writing this post as a tutorial or a 'keep' note for myself, but I think it could be interesting for a lot of people. At work I'm using a Latitude Dell Laptop with dual boot (Ubuntu 16.04 LTS and Windows 10). The laptop has a SD card reader. Usually I work under Ubuntu while I am programming, and the SD card reader support is broken! But typing the following on a terminal, makes it works again:

      sudo rmmod sdhci_pci sdhci_acpi sdhci
      sudo modprobe sdhci debug_quirks2="0x10000"
      sudo modprobe sdhci_pci sdhci_acpi sdhci

      It seems to be a problem since Linux kernel version 4.1.8. A bug report he...

    • 01
      Apr - 2018

      Real Time Systems
      5 min | 2780

      #Raspberry Pi: The N-queens Problem (benchmark) Preempt-RT vs. Standard Kernel

      Real Time Systems | 5 min | 2780


      n-queen problem
      performance
      preempt-rt
      raspberry pi
      standard kernel

      N-Queens Problem: A Benchmarking Solver for Raspberry Pi

      The N-Queens Problem/Puzzle is a well-known problem that consists of placing N chess queens on an N × N chessboard so that no two queens attack each other. For example, one possible solution to the N-queens problem for N = 4 is the following:

      N-queens problem (N=4)
      Fig. 1: N-queens problem example (N = 4). Source: Google Optimization Tools

      As you can see, no two queens are on the same row, column or diagonal. Usually the problem consists to find all possible solutions, rather than one optimal solution.

      I wrote a script in Python that calculates ...

    • 01
      Apr - 2018

      Real Time Systems
      3 min | 4927

      #Rapberry Pi: Preempt-RT Kernel Performance on Rasbperry PI 3 Model B+

      Real Time Systems | 3 min | 4927


      kernel
      patching
      preempt-rt
      raspberry pi 3 B plus
      standard

      The Raspberry Pi 3 Model B+ (Fig. 1) is now on sale and I bought one two weeks ago. The main modifications are the followings:

      • A 1.4GHz 64-bit quad-core ARM Cortex-A53 CPU
      • Dual-band 802.11ac wireless LAN and Bluetooth 4.2
      • Faster Ethernet (Gigabit Ethernet over USB 2.0)
      • Power-over-Ethernet support (with separate PoE HAT)
      • Improved PXE network and USB mass-storage booting
      • Improved thermal management
      Raspberry Pi 3 B+
      Fig. 1: Raspberry Pi 3 Model B+

      The Raspberry Pi uses now the LAN2515 chip from Microchip instead of the LAN9514 for Ethernet and the USB Ports.

      If you are looking for some Benchmarkin...

    • 19
      Mar - 2018

      Real Time Systems
      1 min | 1202

      #Raspberry Pi: Preempt-RT Kernel 4.14.y on Raspberry Pi

      Real Time Systems | 1 min | 1202


      kernel patching
      official branch
      preempt-rt
      raspberry pi

      The forked rpi-4.14.y-rt repo by TiejunChina is now a branch under the official Raspberry Pi repo. That means you need to type the following to clone the Preempt-RT patched Kernel

      ~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git
      ~/rpi-kernel$ cd linux
      ~/rpi-kernel/linux/ git checkout rpi-4.14.y-rt

      Then, you can follow the tutorial from here.

    • 12
      Mar - 2018

      Real Time Systems
      2 min | 2880

      #Raspberry PI Zero W: Preempt-RT Kernel Performance

      Real Time Systems | 2 min | 2880


      kernel
      patching
      performance
      preempt-rt
      raspberry pi zero
      standard

      Today I patched the kernel of a Raspberry Pi Zero W with Preempt-RT. I used the repo TiejunChina.

      Update 18.03.2018: The official Preempt-RT patched Rasbian repo is here.

      ##~/rpi-kernel$ git clone https://github.com/TiejunChina/linux.git # update 18.03.2018: old repository##
      
      ~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git # update 18.03.2018: new repository
      ~/rpi-kernel$ cd linux
      ~/rpi-kernel/linux$ git checkout rpi-4.14.y-rt  # today the kernel version is 4.14.22
                                                      # with rt17 resulting in 4.14.22-rt17+ 

      You can find a complete...

    • 04
      Mar - 2018

      Web designs
      2 min | 863

      #Pagekit: Blog & Gallery Extension & AdsenseKit

      Web designs | 2 min | 863


      ads management
      adsense
      blogging
      gallery
      pagekit
      pagekit extension
      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.

      I've been working with web development this weekend. I hope you didn't have to wait because of a maintenance dialog or a 500 error due to the updates! I updated three things on the blog:

      I forked the first two repositories and modified them. The last one is a package that I designed to manage the Adsense Ads if you use Pagekit as CMS.

      Blog Extension

      I added the visitor counter for the blog post. You can see the eye over the t...

    • 02
      Mar - 2018

      MicroPython
      1 min | 2608

      #Tutorial: Installing dependencies on MicroPython

      MicroPython | 1 min | 2608


      esp32
      esp8266
      micropython
      micropython extensions
      tutorial
      upip
      wipy

      While I was reading my getting stated tutorial about MicroPython again, I noticed that I've forgotten to tell something about dependencies or packages.

      Here is possible to find some MicroPython packages. On the WeMos (ESP32) or the ESP8266, it is possible to install these packages using the upip package manager. The WiPy doesn't have the package.

      To download the new packages, you need to connect the board to the Internet. I take the WeMos as example and typing the following, you can connect the board to your WiFi router:

      ssid_ = <your_ssid>
      wp2_pass = <your wpa2 password>
      
      import network
      sta_...
    • 02
      Mar - 2018

      Travel Photoset, Web designs
      1 min | 717

      #Photo Gallery: Bangkok

      Travel Photoset, Web designs | 1 min | 717


      bangkok
      holidays
      thailand
      travel photoset

      As I promised some photos of Bangkok (Thailand). Enjoy!

      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.
    • 26
      Feb - 2018

      Real Time Systems
      5 min | 6558

      #Raspberry Pi: Preempt-RT vs. Standard Kernel 4.14.y

      Real Time Systems | 5 min | 6558


      kernel patching
      latency
      performance
      preempt-rt kernel
      raspberry pi
      standard kernel

      The last week I was working on a real-time application (with a 1 ms sample time) that runs on an ARMv8 Cortex-A53 (Raspberry Pi 3 Model B based board) and I was wondering the differences between latencies on the standard and the Real-Time (RT) Linux kernel. I had some problems with the standard kernel version, then I thought I could analyze the latencies of both kernels, and make some conclusions. Many test are available but with older kernel versions. The tests were performed using the Raspbian Kernel 4.14.21 and the Preempt-RT Patch 4.14.21-rt17!

      Hardware & Software

      To follow the DIY parts, ...

    • 26
      Feb - 2018

      Real Time Systems
      7 min | 19021

      #Raspberry Pi: Preempt-RT Patching Tutorial for Kernel 4.14.y

      Real Time Systems | 7 min | 19021


      kernel patching
      preempt-rt
      raspberry pi
      raspbian
      standard kernel

      There are a lot of tutorials for Raspberry Pi kernel patching using Preempt-RT, but I needed about 15 hours to get it working! I hate Kernel patching! and I have to say, that's not my first time. I have a system working with Ubuntu, RTAI and an Ethercat master. I patched the system more than once. But it is/was always a new thing! and It costs a lot of time! ;)

      Then, you have another tutorial here. I only hope that the repo gets official. It could reduce the time to get the RT ...

    • 19
      Feb - 2018

      Travel Photoset, Web designs
      1 min | 670

      #Photo Gallery: Melbourne

      Travel Photoset, Web designs | 1 min | 670


      australia
      melbourne
      photo gallery
      travel photoset
      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.

      As I promised some photos of Melbourne (Australia). Bangkok photos are coming this week.

      I don't know if you noticed, but I added two new repositories to GitHub:


      Both repositories are extensions for PageKit. The first one allows you to add Google Adsense ads to the posts. The second one extends the PageKit blog plugin to add categories and tags to the blog posts. I was/am quite busy these weeks, but I am writing the README files. I need to check them...

    • 27
      Dec - 2017

      MicroPython
      4 min | 1187

      #Micropython: Merry Xmas & Happy New Year!

      MicroPython | 4 min | 1187


      esp32
      happy new year
      lights
      merry Christmas
      micropython
      video
      xmas

      It has been a while since my last post! Sorry, I was a little bit busy and then I was on a business trip in Melbourne for the CDC2017 and then I had a week holiday in Bangkok. I will be posting some photos on the next days!

      It's been a year now since I started this blog. It's a hard job to maintain it up-to-date but I still have fun writing and coding for this purpose! So let us start!


      Intro

      The first video that I published a year ago was using the Wipy2.0 and a WS2812b led strip for some Christmas lights (click here). Now, this time I bought a WS2812b panel (100 bits or 10x10 pixels -or le...

    • 01
      Dec - 2017

      Android Things
      1 min | 519

      #ProjectDIVA: Android Things DP6.0 is here!

      Android Things | 1 min | 519


      android studio
      android things
      raspberry pi
      sensor mesh
      sensors

      I will be testing the new release on this weekend!

      The release notes seem promising!

      I have also some new things with Docker and Raspberry Pi!

      Stay tuned!


    • 12
      Nov - 2017

      Hacking, MicroPython, Security
      5 min | 4680

      #Hacking: Wemos (ESP32) & Captive Portal using MicroPython

      Hacking, MicroPython, Security | 5 min | 4680


      captive portal system
      dns
      esp32
      hacking
      micropython

      At the beginning of October I wrote a blog article called White Hacking: WeMos and SquirelCrawl!. I used the WeMos (ESP32) and the firmware provided by Hacker Arsenal to do a captive portal. As you known, a captive portal is a web page which is displayed to newly connected users before they are granted broader access to network resources [wiki]. This can be used in combination with evil portals to obtain login credentials. The firmware provided by Hacker Arsenal has multiple limitations, e.g. the web page has to be a single file, without external files, meaning that all images should be integr...