MicroPython | 11 min | 6610
Therefore, this tutorial will try to accomplish the following points:
- A quick introduction to YOLO(v2)
- A quick introduction to MAix KPU
- Training, evaluation, and testing of the object detector model (on Jupyter-Notebooks running on Docker)
- Flashing the trained model on the MAi...
LoRa/LoRaWAN | 1 min | 250
This is a short article to share with you that I've just registered a LoRaWAN gateway and right now I have one of the 10106 online gateways connected (see Fig. 1) to "The Things Network"!
Fig 1: LoRaWAN gateways in Hanover
I will be making some tests in the coming weeks, and I am planning to redesign the code in lemariva/uPyLoRa to connect to ...
General | 1 min | 776
The following video summarizes the project highlights of 2019! Most of them are implemented using MicroPython on ESP32 and Python on Raspberry/Orange Pi.
The flying video was recorded with a Nexus 5X mounted on the Zhiyun Smooth 4. In the video-edition process, software stabilization was only used on the vertical axis. The Zhiyun Smooth 4 smoothed the horiz...
Holiday season has begun and Christmas and the New Year 2020 are approaching! This means, time to reflect and to clean up code and, therefore, I am updating some of the GitHub's projects to summarize the year. I started with the Christmas lights project! But, this time, I took the M5Stack Fire and a new LED panel (WS2812b - 16x16 pixel) and with the XMasLight project, these are the results (Fig. 1 & 2):
Fig. 1: M5Stack and a new WS2812b Panel (16x16 pixel).
This article extends the tutorial about Hass.io and the Xiaomi Aqara Sensors that I've published months ago. That tutorial is part of the series of articles about Zigbee and the Rasbperry Pi using the CC2531 USB dongle. Here are the links:
This tutorial is about managing a Docker Engine remotely using Portainer connected to the protected Docker daemon socket (
TCP port 2376). By default, you can manage Docker locally through a non-networked UNIX socket (option
-v /var/run/docker.sock:/var/run/docker.sockwhile running Portainer). But, if you want the Docker Engine to be reachable through the network in a safe manner, you need to enable TLS by specifying the
--tlsverifyflag and pointing Docker’s
--tlscacertflag to a CA certificate. Then, the daemon only accepts connections from clients that are authenticated by a certificate si...
Usually, I login to different Docker registries (local, Docker Hub, etc.) with a computer running Ubuntu. I execute once
docker login, then I enter the username and password, and after restarting the system, the access data is still available. That means, I write the credentials only once. But, on the Raspberry Pi, it was different until today: I needed to write the login credentials every time I booted the board.
This article helps you to install the needed tools to save Docker login credentials on the Raspberry Pi, but not as plain text, so that the next time that you reboot the Raspberry t...
General | 1 min | 600
Today is Singles' Day or "Guanggun Jie" in Chinese, which is a popular shopping festival among young Chinese people, who celebrate their pride of being single! Thus, I got some discount codes from Banggood for Today and I'm publishing them here:
This section is new in LeMaRiva|Tech and I will update it every day with new discount codes! I receive a list every day with new codes and I will use some analytics to select the best offers for you and automatically publish them there. Stay tuned!I cannot guarantee that all codes I published on this list work. I analyze the data (p...
Raspberry Pi | 6 min | 6240
This article is the last in a series of three articles that evaluates the performance of the Raspberry Pi 4B. This time the performance of Raspbian with standard kernel (4.19.y) will be evaluated with and without active cooling using two types of heatsinks. The other articles in the series are the following:
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- The first article is about comparing the Raspberry Pi 4B and 3B+ performances:
- The second article compares the Raspberry Pi 4B runn...