• 24
      Dec - 2018

      MicroPython
      1 min | 92

      Merry XMAS and Happy 2019!

      MicroPython | 1 min | 92


      esp32
      happy new year
      jupyter
      lights
      merry Christmas
      micropython
      video
      xmas

      LeMaRiva|tech wishes you a Merry Christmas and a Happy New Year! To celebrate I made a video using the Xmas-lights from last year, but this time I connected the ESP32 to a Jupyter kernel to control the lights. A new Jupyter-ESP32 tutorial is coming soon. In the meantime, you can track Santa and spend time with your family!

      Python Code: https://github.com/lemariva/Xmas-lights

    • 18
      Dec - 2018

      Product Reviews
      1 min | 24

      #Review: InkDrop.tech

      Product Reviews | 1 min | 24


      blockchain
      ether
      product review
      uncensorable social network

      Hi there! the guys at InkDrop need some stars on GitHub! Follow the project and stayed tune! What? You don't know about InkDrop.tech?! Ok, no problem: Here you got a description!

      GitHub Repository: inkdrop-app

      InkDrop

      InkDrop is an open, easy-to-use and uncensorable social network. It is an open source project and can be considered the blockchain community’s answer to the major, privacy invading platforms we depend on today.

      Today’s social networks are centrally controlled & moderated and they don’t pass back the proceeds to the creators. They rely on business models that are irreconcila...

    • 09
      Dec - 2018

      Analytics
      8 min | 652

      #Analytics: Docker for Data Science Environment

      Analytics | 8 min | 652


      analytics
      data science
      docker
      extending docker images
      google cloud platform
      portainer

      Today, I am opening a new section on my blog, and this time it is about analytics. As you may know, I've been working in research on IIoT and analytics for the last years, but up to now my blog has only shown my hobbyist projects. I want to change the focus of my website a little bit and add something about data analytics, machine learning, Docker technology etc. Everything that I will be publishing in this section is not new. There are many tutorials and great YouTube videos that explain these topics too, but I am going to focus on building an end-to-end data science project using some of the...

    • 08
      Dec - 2018

      PCB/Board designs, Product Reviews
      5 min | 123

      #Review: SeeedStudio.com Fusion

      PCB/Board designs, Product Reviews | 5 min | 123


      hobbyist
      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...

    • 26
      Oct - 2018

      MicroPython
      2 min | 267

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

      MicroPython | 2 min | 267


      esp32
      google cloud platform
      micropython
      python
      smart power outlets
      zerynth

      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).
      
      PORT     STATE SERVICE
      6668/tcp open  irc
      
      ...
    • 22
      Oct - 2018

      MicroPython
      5 min | 1128

      #MicroPython: Controlling Smart Power Outlets using an ESP32

      MicroPython | 5 min | 1128


      esp32
      home automation
      micropython
      smart power outlets
      tutorial

      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...

    • 06
      Oct - 2018

      MicroPython
      3 min | 2880

      #MicroPython: ESP32 sending data using LoRa

      MicroPython | 3 min | 2880


      esp32
      lora
      lorawan
      micropython
      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 | 250

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

      Product Reviews, Raspberry Pi | 4 min | 250


      battery
      raspad
      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!)

      Introduction

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

    • 17
      Sep - 2018

      MicroPython
      7 min | 1571

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

      MicroPython | 7 min | 1571


      bmp180
      data access
      google cloud platform
      home automation
      micropython
      python
      zerynth

      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 | 3410

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

      Real Time Systems | 6 min | 3410


      kernel patching
      raspberry pi
      real time system
      xenomai

      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 ...

    • 20
      Jul - 2018

      Real Time Systems
      8 min | 6150

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

      Real Time Systems | 8 min | 6150


      kernel patching
      preempt-rt
      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 | 125

      #ProjectDIVA: Arduino Mini Pro

      Android Things | 2 min | 125


      android things
      arduino mini pro
      nrf24l01
      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.

      Preview

      Requirements

      Hardware & Software


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

      General
      1 min | 80

      Unboxing AIY Vision Kit. A surprise like #KORGER!

      General | 1 min | 80


      deception
      fraud
      google
      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

      MicroPython
      2 min | 409

      #MicroPython: Camera stabilisation application

      MicroPython | 2 min | 409


      9g
      camera stabilization.
      imu
      micro servers
      micropython
      mpu6050
      wipy

      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...

    • 13
      Jun - 2018

      General
      1 min | 106

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

      General | 1 min | 106


      analytics
      hacking
      online sas
      statistics

      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...