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Arduino microcontroller

Making a simple advertisement using Arduino

Summer has started and hiding from the heat, a new video tutorial arrives. The project of creating a simple advertisement using the MAX7219 integrated circuit - LED matrix driver, LED matrix module and Arduino. This task can be solved in a simple way by using external libraries for working with the MAX7219 and the LED matrix in a few lines of code. As a result, an attractive text animation is obtained. It is possible to connect several LED matrix modules, the complete impression would be better.

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Arduino microcontroller

Parola and MAX72xx external libraries

For the purposes of creating a simple advertisement, i.e. for a project in which an LED matrix will be used to display animated text, I used two additional libraries. I chose them because I think it was the simplest solution for working with the MAX7219 IC and animating the text. To begin with, a little about the libraries themselves, and the project will be described in the following text. The libraries in question are MAX72xx and Parola.

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Arduino microcontroller

Graduation assignment 4ETR - B6 - LED lighting

The topic of the assignment is the realization of New Year's LED lighting that will have certain light effects (in this case LED flicker) while the user is enabled to control the brightness intensity in the range from 0 to 100% with two push buttons. Here you will find detailed instructions and explanations of the program. I started with the 6th task from the collection, and there will be more similar texts soon. The practice so far has been to make a video clip and explain the task through text on the blog, and now a document will be available for download.

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Arduino microcontroller

"Hello, world!" Project with LCD 1602 module

As time goes on, the number of components, modules and ideas for Arduino-based projects grows! This time, a widespread component that is an indispensable part of any embedded system will be covered. It is a component whose purpose is to display data - textual or numerical, LCD module 1602a. Introduction to the characteristics of the component, mode of operation and its programming will be illustrated with the help of two simple programs (sketches). The first is "Hello, world!", Which performs a simple display of textual data on the display, while the second includes a display of data obtained from the keyboard.

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Fedora - minimal installation of KDE Plasma environment

After a while, I will talk about Fedora again, because during the previous distro-hopping , Fedora generally left a positive impression on me. I may have been a little harsh to the Gnome environment, but in any case, this distro received a passing grade. Maybe even a C+! Between versions 34 and 35, I noticed significant improvements in the package manager, ie its speed. This text brings one more thing, and that is the bash script for installing Fedora with KDE Plasma environment and all the basic programs to use.

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Arduino microcontroller

Binary counter and shift register 74HG595

At first glance, with the Arduino UNO microcontroller (μcontroller) it can be concluded that the number of digital pins is insufficient for a more serious project. The Arduino Mega offers 54 digital pins, so you can consider purchasing such a microcontroller. Another solution that allows you to increase the number of pins is to use shift registers. In this case, we are talking about the shift register 74HC595. How this is achieved, how a scroll register works and how to use it with an Arduino UNO controller is the topic of this video tutorial and text.

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Arduino microcontroller

Seven-segment LED display

The seven-segment display (single-digit) is one of the electronic components intended for displaying numerical values (integers from 0 to 9). The designation of the component that will be used in the exercise is 5161AS.

What are segments? The seven-segment display consists of 8 LED elements, 7 are used to represent numerical values and 1 LED element is used to represent a decimal point. The segments are arranged in the shape of the number "8". By including precisely defined segments, it is possible to display any number from 0 to 9.

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Arduino microcontroller

The concept and application of "pull up" and "pull down" resistors

When using a microcontroller, when the pin we use as an input is not set to "HIGH" or "LOW" state, but its state "floats" between these two values, we say that it is in a state of high impedance. This is a condition that we definitely want to avoid because it leads to irregularities (unpredictability) in work and that is why we introduce a concept like"pull-up"and"pull-down"resistors. These are not special types of resistors, but resistors that allow us to maintain the desired state of the logic circuit regardless of the conditions. Arduino pin is connected via this resistor to a constant value, either to the + 5V power supply or to the GND (ground). In the first case it is a "pull-up", while in the second we are talking about a "pull-down" resistor.

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Computer network

Networking two computers under Linux

I also dealt a little with this topic, I went into the administrator's waters and looked for a way to network two machines under (Arch) Linux in the simplest way, in order to easily transfer a bunch of data that I need from time to time, and what I allowed myself was fast backups. This is important because I am often do a little distro hopping. One thing is for sure, I always come back to Arch Linux!

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Arch linux

Improving performance on ArchLinux

ArchLinux as a distro gives quite a lot of freedom to the end user to configure the entire system. Starting with the installation that is done from the console (there are TUI and GUI variants, but I'm talking about the basic one), through the post-installation procedure, the user has to adjust everything himself in order to have a functional system, working environment, etc. In this text, I will mention one item, and that is improving the performance of classic hard drivesI will have to quote and publish one by one, because one text cannot cover everything.

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