• Deals, Raspberry Pi
      3 min | 11640

      #Raspberry Pi: Displaying images on an E-Ink screen

      Deals, Raspberry Pi | 3 min | 11640


      anniversary
      banggood
      deals
      e-ink display
      python
      raspberry pi

      Last week, I published an article about the Raspberry Pi and an e-ink display:

      This time, this tutorial is about processing and displaying images on the 7.5" e-ink screen as shown in Fig. 1b.

      Waveshare® 7.5" E-ink Screen connected to a Raspberry Pi
      Fig. 1a: E-ink Screen connected to a RPi
      running ePaperWidgets
      Fig. 1b: Banggood's 13th anniversary
      original image here

      Hardware & Software

      You find here a list of hardware and software that you could use for ...

    • Raspberry Pi
      4 min | 8432

      #Raspberry Pi 4B: How much faster is the new CPU?

      Raspberry Pi | 4 min | 8432


      benchmark
      buster
      jupyter
      n-queens problem
      performance
      raspberry pi 3 B plus
      raspberry pi 4b
      raspbian

      On July 4th, I ordered a Raspberry Pi 4B from Reichelt. On July 17th, I received the board, but it was broken, and a month later, finally I received a new board that seems to work OK :).

      The new Raspberry Pi 4B has a lot of upgrades and one of the most important ones is the RAM: You can choose between three models (1GB, 2GB and 4GB). But, another main change is the CPU and the RAM bus: they changed from a Cortex-A53 64-bit (3B+/3A+) to a Cortex-A72 64-bit, both ARMv8, and from LPDDR2 SDRAM...

    • Raspberry Pi
      7 min | 13673

      #Raspberry Pi: an E-Paper display with Widgets

      Raspberry Pi | 7 min | 13673


      e-ink display
      google apis
      google calendar
      raspberry pi
      raspberry pi zero
      waveshare

      E-paper or e-ink displays are becoming more common in recent days. You can find them e.g. on readers, clocks and sensors. Thus, I looked for an e-ink display for the Raspberry Pi and I found the Waveshare® 7.5" E-ink Screen.

      There are many projects with an e-ink display and the Raspberry Pi, but I first tried with an ESP32 and MicroPython. That solution didn't work (something was not working with the reset voltage - too much signal noise). So, that remains a work in progress and I wi...

    • MicroPython
      4 min | 11477

      #MicroPython: VSCode IntelliSense, Autocompletion & Linting capabilities

      MicroPython | 4 min | 11477


      autocomplete
      esp32
      esp8266
      intellisense
      micropython
      pymakr
      visual studio code
      vscode
      wemos

      Last December, I wrote an article telling you that I was switching from Atom.io to Visual Studio Code to program MicroPython. Nowadays, I'm still using VSCode and the PyMakr extension. The latter enables the communication to a board running MicroPython using the built-in command line REPL. Thus, I can run a single file on my board, sync my entire project or directly type and execute commands using the Terminal on VSCode. However, I was missing some of the main features of VSCode, namely IntelliSense, autocompletion, and linting capabilities. Last month, BradenM contacted me and told me that he...

    • Home Automation, Raspberry Pi
      3 min | 23972

      #Zigbee: Flashing a CC2531 dongle using a Raspberry Pi

      Home Automation, Raspberry Pi | 3 min | 23972


      aqara
      aqara sensors
      door sensor
      home assistant
      mqtt
      pir
      raspberry pi
      xiaomi gateway
      xiaomi sensors
      zigbee

      Last April, I published a tutorial about connecting the Aqara sensors to a Raspberry Pi without using the Xiaomi Gateway. To make that possible, I needed a CC Debugger to flash the TI CC2531 Zigbee Dongle. This debugger was used only one time, and then the Zigbee-USB dongle worked without any problem.

      In this article, I will cover a way to flash the CC2531 without the CC Debugger. This reduces project costs (about $10 for debugger + cable adapters) and waitin...

    • Raspberry Pi
      2 min | 5838

      #Raspberry Pi 4B: Where were the quality controls?

      Raspberry Pi | 2 min | 5838


      board broken
      capacitor broken
      quality control failed
      quality problems
      raspberry pi
      raspberry pi 4b
      tantalum capacitor

      On July 4th, I ordered a Raspberry Pi 4B. To be honest, I really didn't/don't need a new Raspberry Pi, I don't have any specific task for it, but I saw some cool stuff on the Internet, and I said: Ok, I need one! Thus, I bought the 4GB model on Reichelt. The expected delivery date was on July 10th but, I had to wait a little longer and I got it on July 17th! Everything was ok, and I got the following closed and sealed box (see Fig. 1):

      raspberry_pi_box-min.jpg
      Fig. 1: Box of the Raspberry Pi Model 4B (4GB RAM)

      But, as soon as I opened the box, my joy faded! :( With a quick visual control, I checked tha...

    • General, MicroPython
      1 min | 1843

      #Collector: Things that I recently bought - XIAOMI Wowstick & ESP32 8MB PSRAM

      General, MicroPython | 1 min | 1843


      development boards
      electric screw driver
      esp32
      esp32 8mb psram
      micropython
      misc article
      xiaomi wowstick

      This is a misc. small article. Two month ago, I bought on Banggood two articles that I wanted to show you, but this time, these are not connected to an application, code or a detailed product review. This is only a misc. article to describe my purchase: The Xiaomi Wowstick Screw Driver and the TTGO ESP32 WROVER with 8MB PSRAM.

      Hardware

      Xiaomi Wowstick

      If you are looking for a very small electric screw driver, then the Xiaomi Wowstick is an option for you. It in...

    • General, Product Reviews
      5 min | 2551

      #Timeular: Tracking your time using an Octahedron

      General, Product Reviews | 5 min | 2551


      access to data
      bluetooth
      getting things done
      octahedron
      product review
      time tracker
      time tracking system
      timeular

      First of all, this article is a product review which was/is not supported by Timeular GmbH or similar. I bought the product two weeks ago, because I wanted to test it. I missed out the Kickstarter campaign (2016) and the regular price for the octahedron was too expensive for me.

      Timeular application: Analytics Dashboard
      Fig. 1: Timeular application

      This summer, the tracker is on sale with up to 50% discount and I bought the basic plan. I got an octahedron -called tracker- which connects to the Timeular application (Mac, Win...

    • Home Automation, Product Reviews, Raspberry Pi
      2 min | 6769

      #Zigbee: Reading Xiaomi Sensors with a Raspberry Pi (no Xiaomi gateway needed!)

      Home Automation, Product Reviews, Raspberry Pi | 2 min | 6769


      aqara
      docker
      hass.io
      home assistant
      home automation
      product review
      raspberry pi 3 B plus
      xiaomi gateway
      xiaomi sensors

      I've been very busy the last weeks. I moved to a new apartment and I was living between moving boxes. Four days ago, I managed to put my desk together and now I have some time (not a lot) to write a new article.

      Last month I've received from GearBest two Aqara sensors:

      • Aqara Cube - internal motion sensors (gyro + accelerometers)
      • Aqara humidity, temperature and air pressure

      These sensors use Zigbee and I connected them to a Raspberry Pi running Raspbian OS and a dockerized version o...