• 09
      Dec - 2018

      PCB/Board designs, Product Reviews
      5 min | 1529

      #Review: SeeedStudio.com Fusion

      PCB/Board designs, Product Reviews | 5 min | 1529

      pcb boards
      pcb designs
      product review
      seeed fusion studio

      On August I was contacted by Ben from Seeed Studio to review the Fusion service. I received a coupon, which could be used only to order PCB.

      To define the Fusion service, I take this text from its website:

      Seeed Fusion Service offers one-stop prototyping services for PCB manufacture,PCB assembly and other electronic and mechanical customized services such as CNC Milling, 3D printing and PCB layout services.

      I didn't have at that time a design but I had something in mind that uses communication technology. I was experimenting using LoRa technology and I thought, I could managed to design a b...

    • 27
      Oct - 2018

      Cloud Platforms, Home Automation, MicroPython
      2 min | 1573

      #Zerynth: ESP32 & Google IoT Core - Part 2: Getting data from Smart Power Outlets

      Cloud Platforms, Home Automation, MicroPython | 2 min | 1573

      google cloud platform
      smart power outlets

      This part 2 of the tutorial will allow you to get data from the smart power outlets and send it to the Google Cloud Platform (GCP) throught the Google IoT Core and using an ESP32 programmed with Zerynth (Python). This data is not usually available to the user (directly, you need to use the power outlet application), and it is sent to the company servers.

      If you want to check, if your power outlets are compatible for this tutorial, they should have the port 6668 opened. To check that:

      >>> nmap <<ip-address>> -p 6668
      Host is up (0.13s latency).
      6668/tcp open  irc
    • 23
      Oct - 2018

      Home Automation, MicroPython
      5 min | 7429

      #MicroPython: Controlling Smart Power Outlets using an ESP32

      Home Automation, MicroPython | 5 min | 7429

      home automation
      smart power outlets

      Today there is a wide range of offer for home automation devices. A lot of sensors, actors etc. can be connected to the cloud and be controlled using Google Home, Amazon Alexa, your smartphone, etc. There are a lot of companies offering low cost devices, e.g. Sonoff, Tuya, Teckin etc. Most of these solutions are based on ESP32 or ESP8266, and all of them send data to cloud solutions usually deployed on Amazon services, and the data is only accessible using the Android/iOS applications. They can be also controlled using voice commands over Google Home or Amazon Alexa devices.

      Nice, but... my a...

    • 07
      Oct - 2018

      3 min | 18007

      #MicroPython: ESP32 sending data using LoRa

      MicroPython | 3 min | 18007

      wireless communication

      LoRa (Long Range) is a patented digital wireless data communication technology. It was developed by Cycleo of Grenoble in France and then acquired by Semtech in 2012. Semtech defines the Lora Technology "as the DNA of IoT, which connects sensors to the Cloud and enables real-time communication of data and analytics that can be utilized to enhance efficiency and productivity".

      To sum up, LoRa is a wireless data communication technology that enables very-long-range transmissions (more than 10 km in rural areas) with low power consumption. It uses license-free sub-gigahertz radio frequency bands ...

    • 18
      Sep - 2018

      Product Reviews, Raspberry Pi
      4 min | 1364

      #Review: RasPad - a tablet for open-source platforms like Raspberry Pi

      Product Reviews, Raspberry Pi | 4 min | 1364

      raspberry pi
      table for raspberry pi
      touch screen

      This is my first review on a product that I bought. I hope you enjoy it! Advices and tips are welcome. Please leave me them in the comment section.

      Update: I changed the title of the article from "#Reviews: RasPad - an open source tablet for Raspberry Pi" to "#Reviews: RasPad - a tablet for open-source platforms like Raspberry Pi". The table is a close-source solution for open-source platforms like Raspberry Pi, Beaglebone, etc. (thanks Zykino for your advice!)


      At the beginning of March I supported the Kickstarter campaign called RasPad. I pledged for the Super Early Bird - RasPad...

    • 17
      Sep - 2018

      Cloud Platforms, MicroPython
      7 min | 4479

      #Zerynth: ESP32 & Google IoT Core - Part 1: Sending data to the Cloud

      Cloud Platforms, MicroPython | 7 min | 4479

      data access
      google cloud platform
      home automation

      There are lot of tutorials about connecting the ESP32 to a cloud service, but I planned to connect these boards using MicroPython directly to the cloud. That means, I didn't want to use a hardware or software bridge. I wanted to use the Google IoT Core, but MicroPython doesn't support JSON Web Token (JWT), which is needed for the device authentication. I tried to write the library myself, but it didn't work, because of the needed dependencies and the small memory available on the ESP modules. But, I found Zerynth. Zerynth supports JWT and using it, it is possible to connect the ESP32 directly ...

    • 21
      Jul - 2018

      Real Time Systems
      6 min | 10801

      #Raspberry Pi: Real Time System - Xenomai Patching Tutorial for Kernel 4.14.y

      Real Time Systems | 6 min | 10801

      kernel patching
      raspberry pi
      real time system

      The website of Xenomai says the following about it Xenomai:

      Xenomai brings POSIX and traditional RTOS APIs for porting time-critical applications to Linux-based platforms. When the native Linux kernel cannot meet the response time requirements of the application, Xenomai supplements it with Cobalt, a small real-time infrastructure which schedules time-critical activities independently from the main kernel logic.

      Checking the list of supported hardware, the Raspberry Pi 2, 3 B(+) ARM micro (BCM2835) is included.

      This tutorial is almost the same as the tutorial for Preempt-RT patching, but in ...

    • 21
      Jul - 2018

      Real Time Systems
      8 min | 23713

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

      Real Time Systems | 8 min | 23713

      kernel patching
      raspberry pi
      real time system

      The Preempt-RT tutorial article is the most visited post on my blog. Therefore, I decided to update the tutorial to make it cleaner, and to introduce some other possible modifications and tips for solving problems.

      Preempt-RT is a popular patch for the Linux kernel to transform Linux into such a real-time operating system. There is another option to get this done, and that's Xenomai (tutorial and performance tests here).

      Tiejun Chen, the main responsible for the official Raspberry-Pi-RT branch, has published a video about Preempt-RT here. It includes tips, results and tests.

      Getting the Sour...

    • 10
      Jul - 2018

      Android Things
      2 min | 1555

      #ProjectDIVA: Arduino Mini Pro

      Android Things | 2 min | 1555

      android things
      arduino mini pro
      raspberry pi
      sensor mesh

      This article extends the node tree of ProjectDiva to include an Arduino Pro Mini.

      This article explains how to connect a Arduino Pro Mini to the nRF24Things application (Android Things). The code allows sending and receiving messages between the nodes. It uses the well-known nRF24 libraries to create a sensor mesh, where the node 0 (in this case a Raspberry Pi running the Android Things application) actuates as a "DHCP" server and assigns the node addresses in the mesh.



      Hardware & Software

      Arduino Pro Mini Arduino Mini Pro (3.3V) x 1   
      nrf24l01+ NRF24L01+ x1
      ftdi1232 FTDI-1232 x1
      Jumper Cables Jumpe...
    • 06
      Jul - 2018

      1 min | 698

      Unboxing AIY Vision Kit. A surprise like #KORGER!

      General | 1 min | 698

      google aiy vision kit
      raspberry pi
      target manhattan

      Unboxing Google AIY Vision Kit picked up at Target Manhattan Herald Square -New York!- (Target.com) . Also for the fans of Google AIY Voice Kit keep watching! If anyone made the same experience, please advise!

      @Target: It will be great to hear from you!
      @Google: Congratulations on your choice of business partner!

      If you are going to buy something in this shop, please double check the package and the contain before you leave the shop!

      Update 9.07.2018: I managed to get the money back after a 45-minute chat session.

    • 16
      Jun - 2018

      2 min | 2643

      #MicroPython: Camera stabilisation application

      MicroPython | 2 min | 2643

      camera stabilization.
      micro servers

      To continue the series of posts "connecting sensors to MicroPython", this article is about the MPU6050 (you can use also the MPU9255, I am still waiting for the Chinese sensor package) and the WiPy 3.0. Combining the IMU sensor with the WiPy and two micro servos 9g, it is possible to stabilize a camera (tilt/rotate).

      To calculate the compensation needed for the stabilisation, I added the umatrix, quaternion and ulinalg libraries to the project to make matrix multiplication and quaternion to Euler conversion. The ahrs library from Madgwick fusions the data of the accelerometer, gyroscope (and m...

    • 14
      Jun - 2018

      1 min | 1097

      #Hacking: Hey, YOU! Online SAS user! STOP now!

      General | 1 min | 1097

      online sas

      I got you! Please stop trying to hack my website! It's just a small blog! You are ruining my stats! ;)

      Sorry to the other users!, but the last two weeks, someone was using the cloud system ofOnline SAS to try to hack my website. Yes, you heard that right! Someone is trying to hack this small blog! and I can tell you: That's illegal! ;) In the terms and conditions of Online SAS that is NOT allowed! ;P

      Are Paris IP-addresses going to be the next Nigeria IP-addresses? abuseipdb.com has a lot of Paris IP-addresses declared as risky!

      Leave a comment, if you have more info, and if you are the guy tr...

    • 04
      Jun - 2018

      Android Things
      1 min | 1346

      #TI: SensorTag working on Android 8.1

      Android Things | 1 min | 1346

      android studio
      sensor tag
      texas instruments

      Thanks Sal for your comments on the article TI: Sensortag CC2650 . This is for you and those who are playing with TI SensorTag!

      I've updated the repository of the Texas Instrument (TI) SensorTag CC2650. The repository can be found here . As you may know TI doesn't update the repository anymore. The original last open source repository of the application can be found here .

      I've wrote an article last year as I migrated and updated the repository:

      Today, I've updated the repository to support Android 8.1 (>6.0). The main modification was that Android >6.0 needs locatio...

    • 03
      Jun - 2018

      4 min | 8426

      #Tutorial: Getting started with MicroPython: Sensors - Part 1

      MicroPython | 4 min | 8426

      sense environment

      One of the most visited articles on my blog is the Getting started with MicroPython! tutorial. If you still don't know what is MicroPython and you want to start programming microcontroller boards (ESP32, ESP8266 etc.) using a small version of Python 3, you should look at that article . Don't expect to use machine learning or/and other big libraries (the available RAM and microcontroller performance is far away for that aim), but you can do some projects like these:

    • 13
      May - 2018

      Android Things
      1 min | 990

      #ProjectDIVA: Android Things v1.0!

      Android Things | 1 min | 990

      android things
      sensor mesh
      sensor tag

      Google has released Android Things 1.0 this week to developers with long-term support for production devices.

      I've updated today the two applications to run on this Android Things version:

      Additional resources

      Take a look at the full release notes for Android Things 1.0, and head over to the Android Things Console to begin validating your devices for production with the 1.0 system image. If you are looking for a Getting Started on Android Things, head over to these posts: