[EN] Try the SoftHost USB library for ESP32.

This article is an example of using nathalis‘s ESP32 Soft Host to try and test it on an OLED display with a resolution of 128×64 dots as shown in Figure 1 to receive data from a keyboard or mouse, it uses only a few GPIO pins but receives data from a keyboard with a large number of keys. Normally, the ESP32 microcontroller does not support a direct USB connection, so it requires programming by using a timer to check the status of the pins D- and D+ to be assembled into data at the byte level and assembled into packs of data for further interpretation.

Figure 1 Connected devices and boards are illustrated in this article
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[EN] Simple MineSweeper

This article is an experiment to create a Simple MineSweeper as shown in Figure 1, using an ESP32 microcontroller board with a 1.8″ REDTAB st7735 display. The display resolution is 128×160, the same hardware as Simple Tetris [Part 1, Part 2 and part 3] mentioned earlier, still using MicroPython as the main. The explanation starts step by step from screen generation, randomization, counting, motion control, scrolling the options frame turn off visibility, establishing a relationship between identifying where the bomb is likely to be, picking open and counting points at the end of the game.

Simple MineSweeper is one of the first games we’ve been imitating to study ideas and develop programming techniques since the DOS era and the GUI-based Windows operating system DOS, which was written and worked on the DOS operating system at the time, change the mode to graphics mode to contact with mouse and draw pixels by yourself (It’s the same thing as writing on the ESP32 microcontroller board, but it doesn’t have an operating system to use) So let’s get started.

Figure 1 simple mineSweeper
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[EN] Simple Tetris Ep.3

The final article on making a Simple Tetris game using MicroPython and an esp32 microcontroller, as written in parts 1 and 2 of the first two articles, is described in the article below. Readers learn to design data structures, drawing the seven types of falling objects and controlling them to move left, right, and rotate. The second article has the object fall from above and keep the object’s position state. And in this article, the falling objects can be stacked along with moving left, right, and rotating the object will check for collisions with previous objects that have fallen before. Also, check if the object falls to the bottom if there are any rows without spaces. If any rows with no spaces are found, they will be deleted. And finally added a section to check the end of the game in case there is no place for objects to fall and move again as in Figure 1, ending our simple game making process.

Figure 1 Our game in this article
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[EN] Simple Tetris Ep.2

From the previous chapter, we have drawn the background, random objects, object drawing, left and right moving and rotating. In Part 2 of the article, which is the preceding final chapter of the Tetris series, the topic is about creating a backdrop as a grid data structure. If an object falls to the bottom, it converts that object to a table of data as shown in Figure 1, and improves the way the object falls and controls/renders the new object by using a timer without checking for collisions from moving left / right, checking if the falling object overlaps the previous object, rotation and row cutting, which will be discussed in the last article or Simple Tetris Ep.3

Figure 1 The game in this article
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[EN] Simple Tetris Ep.1

This article introduces how to write a simple Tetris game by displaying it in a grid of 10 widths and a height of 16 as shown in Figure 1. Using esp32 microcontroller board connected to ST7735 display and 8 switches for controlling. Importantly it is written in Python via MicroPython compiled using the st7735_mpy library. In this article, we talk about storing 7 types of objects that fall, to support the display and rotation of objects with moving objects left and right. The controls and logic of the Tetris game will be discussed in the next article.

Figure 1 Sample game in this article
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[EN] How to make the stopwatch?

From the article Create a clock that displays an analog display through a color display, this time, it has been modified to make it work as a timer or stopwatch by using the ESP32-CAM board connected to the TFT display and using a switch from pin GPIO0 used as a mode switch or program chip when booting the system or supply power to board ESP32-CAM as shown in Figure 1 and programming still uses Python language with MicroPython as always

Figure 1 dCore RED, esp32cam+REDTAB
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[EN] List the serial ports connected to the RPi with pySerial and PyQt5.

In the previous article, we have read the list of devices connected to the serial port of the Raspberry Pi board or RPi with the pySerial library in text mode as shown in Figure 1. This article combines the previous working principles with the use of a graphical user interface via the PyQt5 library, listed in the combobox for users to choose from. If no serial port connected to the board is found, the RPi disables the combobox from user selection. Therefore, this article discusses the implementation of pySerial with the QLabel and QComboBox libraries. PyQt5.

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[EN] Binary Search Tree data structure programming with Python.

In the previous article, programming to implement queue-based data structures was introduced. In this article, we introduce programming to manage another type of data structure which has different storage and management methods called BST tree or Binary Search Tree, as shown in Figure 1, which is a structure that can be applied to data collection with attributes in which the data in the left branch is less than itself and the right branch is greater than itself or the opposite, i.e. the left branch has a greater value and the right branch is less. It enables searching for data in cases where the tree is balanced on the left and right in the BST structure, saving half the time or number of search times per round of available data, e.g. 100 data sets in the first round if it is not the information you are looking for will be left with a choice to find from the left or right branches which the selection causes the information of the other side is not considered or cut off approximately half. However, if the Binary Search Tree is out of balance, the search speed is not much different from the sequential search.

In this article, we use Python that works on either a Python 3 or MicroPython interpreter to store the data, adding information ,searching for information as an example of further development.

BST : Binary Search Tree
Figure 1 BST
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[EN] Control movement from a joystick via WiFi with MicroPython.

This article is based on the article programming a client/server for a weather station over a wireless network or WiFi to modify from reading data from sensors to joystick shield (Arduino Joystick Shield) so that it has become a wireless game controller using MicroPython and an ESP32 microcontroller as shown in Figure 1. It is possible to control the movement of objects in the display via a ST7735 TFT screen connected to another ESP32. It will be found that the Python implementation of MicroPython is applicable in this example. And with an easy-to-write language and code that can be modified without recompiling and uploading, it’s easy to write prototype code for further development at a higher speed.

Control movement from a joystick via WiFi
(Figure. 1 Our board)
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