This article is to convert the implementation of the regression model from the article of ESP32-C3 to NumPy on Raspberry Pi and PC and use the display as Matplotlib, as shown in Figure 1, which can be found from the previous article. The temperature and humidity from the 1-day data were obtained from parameters a and b of the regression equation and the resulting equation or model was used to determine the possible temperature values over the 1 day.
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.
Figure 1 Connected Arduino Uno and ESP32-S2 to Raspberry Pi
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.
This article discusses the use of Python language pySerial library on Raspberry Pi or RPi both 3rd and 4th generation to connect to the serial port. It can be done in 2 ways, the first is to use hardware like ET-CONV10/RS232 HAT that has been written in the book and with the use of a USB port connected to a converter to be a serial communication port (USB to Serial Port) as shown in Figure 1. This article uses the second method to run pySerial to check how many serial ports are connected and what are their names as an example in Figure 8.
This article is a collection of examples of Tic-Tac-Toe games that our team uses to teach game development in different languages as appropriate for the group of learners. But most of them use Python for teaching because it is easier to explain and write than other languages. In addition to wanting to see how it can be implemented on other platforms, we used an example with the MicroPython of a board we named ml4m. Based on this board, TensorFlow Lite is installed on an ESP32 with a 4MB ROM. The board looks like Figure 1.
This article discusses Python multi-threaded programming. Compiled from the website tutorialspoint.com (Make this article a memo). Running multiple threads is like running several different programs at the same time, but it’s useful:
Each thread can share the memory with the main thread and can communicate with each other.
Threads are smaller processes because they consume less memory than process calls.
pyglet is a Python library to create windows and cross-platform multimedia on Windows (Windows), MacOS (macOS) and Linux (Linux) for developing games or visualization applications. The library itself supports creating windows, integration with users through an event-based system, support OpenGL graphics, image/video loading support, and playing music. This article discusses installing and using pyglet on Raspberry Pi 3 B+ and Raspberry Pi 4 as a test device.
