[EN] Queue data structure with array and Singly Linked List.

This article describes Queue Data Structures previously written in the Python Queue Data Structure article and is frequently used with the MicroPython example, but this article is written in C via Arduino IDE to use with microcontroller board LGT8F328P, SAM-D21, ESP8266, ESP32 and ESP32-S2 as shown in Figure 1 by using an example of the array structure and a single link list as a queued data structure. This article is probably the last article on JarutEx.

Figure 1 ESP32-S2, LGY8P326P and SAM-D21
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[EN] Stack data structure with Singly Linked List.

This article describes a stack data structure to write programs in C on various platforms using a single linked list data structure as a stack data store with examples of the array as storage and test the operation with the microcontroller board LGT8F328P, SAM-D21, ESP8266, ESP32 and ESP32-S2 as shown in Figures 1 and 2. In case of wanting to use with other platforms, you can still modify the code for use such as the same.

Figure 1 ESP32, LGY8P326P and SAM-D21
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[EN] Arduino: Control robot’s movement via browser with esp8266 Part 2

Based on the previous article that uses a single esp8266 for controlling the Agent, the number of pins that the esp8266 microcontroller (as written in the MicroPython article about machine.Pin) is limited. Many of the pins are used at boot up causing unintended errors such as the wheel spinning when the system starts and stops when the system finishes booting, etc. Therefore, in this article, a microcontroller board LGT8F328P is added as shown in Figure 1, or the reader may change to other Arduino family microcontrollers, such as Arduino Nano or Arduino Uno, etc. by giving that LGT8F328P is part of the Actuator that acts as a movement in the environment. It can be commanded to go forward, backward, turn left, turn right and stop, reducing the workload of the esp8266 and making it more responsive to WiFi communication.

Figure 1 LGT8F328P is integrated into a robotic car system to control the movement
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[EN] Arduino: Control the movement of the robot car through the browser with the esp8266.

From the article Controlling a Servo 2-Wheel Robot in the ESP8266+RoboServo and the DC electric motor in VisionRobo Car: Drive Motor, we have taken the 2nd built-in robot car from the Raspberry Pi to the ESP8266 to operate via WiFi using the guidelines from the ESP-01s+Relay article. Let’s rewrite Arduino’s C/C++ with the WebServer class from the ESP8266 article to MicroPython. Thus, by the end of this article, the robot can be operated in the first example by connecting a phone or communication device. Go to 192.168.4.1 and order it to go forward, backward, turn left, turn right, or stop.

Figure 1 The robot in this article
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[EN] Generate temperature and humidity graphs with data from Singly Linked List.

From the article Singly Linked List Data Structures, the use of the DHT11 sensor module with the STM32F103 microcontroller, and the use of the TFT display module based on the st7735s controller, the idea of this article is to take an example of using a singly linked list data structure to collect the temperature and humidity values to find the maximum, minimum, average, together with the data in the list to display in the form of a graph as shown in Figure 1.

Figure 1 Result of the article
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[EN] Singly Linked List

This article is about programming C/C++ with Arduino Nano, Arduino Uno, LGT8F328P or other boards with C-capable platforms. A pointer is used to point to a memory address and memory management methods, including memory reservation memory access and deactivating the use of memory to create a method for storing data in a Single Linked List along with an example program used to store a list of temperature and humidity values ​​from the DHT11 module as shown in Figure 1.

Figure 1 Microcontroller with LGT8F328P and DHT11 module
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[EN] LittleFS Filesystem

The article discusses the use of the LittleFS library and introduces a library developed for use with the esp32 microcontroller, which includes a plugin for the Arduino IDE for uploading files to the microcontroller’s ROM. Make it convenient to load data to store and run. For this reason, if programmers find it difficult to transcode HTML/CSS/JavaScript to be a string manually and switching to uploading files to esp32 and reading the web files directly to use will be something that will require training to use LittleFS as a reliable library.


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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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[TH] Queue data structure with array and Singly Linked List.

บทความนี้เป็นการอธิบายเกี่ยวกับโครงสร้างข้อมูลแบบคิว (Queue) ซึ่งได้เคยเขียนถึงไปในบทความ Queue Data Structure ที่เป็นภาษาไพธอนและถูกนำไปใช้บ่อยกับตัวอย่างของ MicroPython แต่บทความนี้เป็นภาษา C ที่เขียนผ่าน Arduino IDE เพื่อใช้งานกับบอร์ดไมโครคอนโทรลเลอร์ LGT8F328P, SAM-D21, ESP8266, ESP32 และ ESP32-S2 ดังภาพที่ 1 โดยยกตัวอย่างการนำโครงสร้างแถวลำดับ และลิงค์ลิสต์เดี่ยวมาเป็นโครงสร้างข้อมูลแบบคิว และคงเป็นบทความสุดท้ายบน JarutEx แล้วครับ

ภาพที่ 1 บอร์ดไมโครคอนโทรลเลอร์ ESP32-S2, LGY8P326P และ SAM-D21
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