Inkdrop tech

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

Docker Repository:


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 irreconcilable with user privacy and network access is blocked in many countries.

What makes it unique is that it runs fully decentralized on the Ethereum Blockchain and IPFS, which means that no data or content is being stored on any private servers. This is the promise of the new Web (Web3), where the network belongs to its users.

The integration of the native cryptocurrency Ether, is being used to incentivize fruitful user behavior and enable self-regulation of the network. Ultimately, the ones who advance the network as a whole are the ones that profit from it.

The social network is accessible via a user-friendly web app on and you can fork the open source code on GitHub.

Jupyter Docker

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#Analytics: Docker for Data Science Environment

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 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 projects that I made using MicroPython and Android Things as sensors, using Docker and the Google Cloud Platform.

This post is a short guide for using Docker as an environment for data science. Docker allows you to almost say goodbye to OS troubles and welcome to portability!

Docker logo
Fig. 1: Docker

One of the most time consuming and annoying part that you have when you try to share your work with your co-worker is to install and setup all libraries and packages of your environment, ie. if you've developed some cool algorithm or pipeline to process data and you want that your co-worker does the evaluation process, he or she needs to install all the libraries that you've locally (or in an environment) installed. You can also add as a problem, that your co-worker needs an specific version of a library that is not compatible with your code because it is an old version. Or, he/she is working on Windows and you are on Linux and you cannot find the right libraries to install on Windows. Then, your new friend should be Docker! and as I said before, say goodbye to OS troubles and welcome to portability!

seed fusion studio

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#Reviews: Fusion

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 board that includes an ESP32, GPS, IMU, air quality sensors and datalogger together. The results is the BikeTracker board. I sent to Seed Fusion the board revision v1.0 (the actual revision is v1.4).

Note: Revision v1.0 was a quick and easy test. I took the board modules that I had (GPS module, IMU module and etc.) and I put them together on a PCB. It was only a test to see, if that was possible. If you plan to make the BikeTracker, you should download the latest revision. All the sensors are now on a single PCB, but it is difficult to solder ;). I already ordered the new boards on other PCB supplier, and I am in testing phase now. Stay tuned to see the latest design working.

I use Eagle to design the boards. Eagle is now part of Autodesk, but it has still a free limited software version for hobbyists and makers, which includes 2 schematic sheets, 2 signal layers, and an 80cm2 board area. That is enough for my design.

Teckin ESP32

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

If the answer is as shown above, the port is opened. If you don't have the nmap application and you are on Windows, look at the Nmap Network Scanning tool. On Ubuntu type on a terminal sudo apt-get install nmap.

Teckin ESP32

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#MicroPython: Controlling Smart Power Outlets using an ESP32

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 aim was to control these devices locally (using LAN and not Wi-Fi) and send the data to the Google Cloud Platform (GCP) to make some analytics later. To be clear, when you use the Android/iOS application (or Google Home/Amazon Alexa) and you switch on/off e.g. a smart power outlet, the application connects with the company server in which the smart power outlet is registered and it sends the command. Then, the server sends back the action to your smart outlet. An exception is Amazon Alexa that sometimes connects directly to the devices (e.g. Belkin switches / Philips Hue), when you are at home on the same network (Wi-Fi). That's why you can re-program the Sonoff devices using Sonoff-Tasmota and then, you don't need a cloud connection anymore. However, if you use Google Home, this is not possible.

To sum up the aim of this post: Using this tutorial, you'll be able to control locally (LAN) most of the low-cost smart power outlets using an ESP32 programmed in MicroPython. Additionally, you can use the available data to do some analytics.

Note: Application like home assistant allows you to make this too, but you need at least a Raspberry Pi to run it, and that means power consumption. That's why, I like to do this with an ESP32 and of course, using MicroPython!

ESP32 LoRa

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#MicroPython: ESP32 sending data using LoRa

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 as the 169 MHz, 433 MHz, 868 MHz for Europe and 915 MHz for North America. The technology can be divided in two parts:

  • LoRa: the physical layer,
  • LoRaWAN (Long Range Wide Area Network): the upper layers.

Here the code:

Python Code:

Raspad post banner min

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

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.


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

  • Power Adapter
  • RasPad Without Raspberry Pi

I didn't want the RasPad Kit because I had a Raspberry Pi B+ that I wasn't using.

The estimated delivery was May 2018, but as it usually happens with the Kickstarter campaign, it was delayed and arrived last week (12.09.2018).

RasPad kit!
Fig. 1: RasPad

Rpi zero rt performance min

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

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 to the Google IoT Core. The company Zerynth defined its product as "the middleware for IoT and Industry 4.0" and the ecosystem was stable as far as I tested it. The IDE (Zerynth Studio) can be a little bit improved, but it works well enough.

Zerynth is neither free nor open-source but every new user gets a welcome pack with 10 Zerynth VM licenses with FreeRTOS (5 Starter and 5 Premium) for free (more info here). If you need to register more sensors, you can use the store to purchase the additional licenses.

Important NOTE: I didn't get any money to promote Zerynth, I just wanted to use Python to connect the ESP32 directly to the Google IoT Core and this was the only option that I've found. If you know another one, please comment this post or send me a message. Thanks!

RPI Xenomai Patched Kernel

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

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 this case, we need to patch the kernel. The patched Preempt-RT sources are included in the official Raspberry Pi repository. If you need a tutorial for patching the kernel click on the link above.

Preempt-RT Real Time Linux

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

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.

Arduino nrf24

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#ProjectDIVA: Arduino Mini Pro

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 RF24 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.

Vision KIT

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Unboxing AIY Vision Kit. A surprise like #KORGER!

Unboxing Google AIY Vision Kit picked up at Target Manhattan Herald Square -New York!- ( . 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.


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#MicroPython: Camera stabilisation application

To continue the series of posts "connecting sensors to MicroPython", this article is about the MPU6055 (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 magnetometer, only with MPU9255) and allows to calculate the rotation of the IMU in quaternion coordinates. I rewrote (most of) the libraries to be compatible with MicroPython.


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

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? has a lot of Paris IP-addresses declared as risky!

Leave a comment, if you have more info, and if you are the guy trying to hack my website, please STOP!!!

Sensortag android min

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#TI: SensorTag working on Android 8.1

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 location permission for BLE to work. It was first reported as a bug but Google closed the report with status: Won't Fix (Intended Behavior):

To access the hardware identifiers of nearby external devices via Bluetooth and Wi-Fi scans, 
your app must now have the ACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION permissions