NodeMCU – Page 2

[EN] The MicroPython Internal File System.

By jarutex December 9, 2021

This article is an implementation of the MicroPython file system using the esp8266 and esp32 microcontroller boards as an experimental board. The file system usage involves directories and files including connecting the device to be seen as a MicroPython file system, for example, connecting to an SD-Card to see it as a system directory, etc. It uses the os class to create, open, access, write data and disable files which will be part of MicroPython’s file class.

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[EN] ESP8266/ESP32 WiFi

By jarutex December 5, 2021

The ESP8266 and ESP32 boards are equipped with built-in WiFi connectivity. They can work in both self-application mode (Access Point) and client mode connected to an existing WiFi network or STA. Developers can set the device name (ESSID) or use the default name from the system as MicroPython-xxxx, where x represents the MAC Address of the device, the password is micropythoN (developers can assign new) and the IP Address (IP Address) is 192.168.4.1.

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[EN] Ticker Class : esp8266 Timer interrupt

By jarutex November 22, 2021

This article discusses using a Ticker with an ESP8266 microcontroller to generate clock interrupts instead of delaying with delay(), the amount of time spent by looping with delay() is used to do other things and create efficiency for the developed software.

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[EN] u8g2 Library

By jarutex November 19, 2021

From the article on using the ESP8266 with an OLED graphical display written in Python, you’ll find that it’s fast and easy but when used with other microcontrollers that cannot use Micropython or CircuitPython, what must be done? One of the many options is the u8glib or u8g2 (Universal 8 bit Graphics Library) libraries, designed to work with monochromatic 8-bit graphics over either I²C or SPI communication. In this article, we are using I²C OLED as shown in Figure 1.

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[EN] ESP Class

By jarutex November 17, 2021

This article is a detailed look at the ESP.h file of esp8266 Arduino to learn the functions that are very useful for programming to control the operation of this microcontroller such as knowing the amount of memory remaining or the largest memory size that can be reserved. This is used if you want to write a program that uses dynamic memory to store a list of all found APs, for example, programmers can use this class directly from the ESP object.

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[EN] ESP8266 WebServer

By jarutex November 15, 2021

This article is an experiment to make the esp8266 microcontroller a web server to display temperature and humidity values from a DHT11 sensor using the Adafruit library as shown in Figure 1. When the microcontroller is run in SoftAP mode, the client or user connects to WiFi after using the browser to access 192.168.4.1 which is the IP of esp8266.

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[EN] ESP-01s + Relay

By jarutex November 13, 2021

This article is an application of the ESP-01s module connected to the ESP-01/01s Relay v4.0 as shown in Figure 1 to enable the relay to work. The example program is to turn the relay on and off via a web browser, which has been mentioned in some WebServer articles, but in addition to catching URLs for arguments to work.

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[EN] ESP-01s

By jarutex November 12, 2021

This article introduces the esp8266 module named ESP-01s with 8 pin connectors, explaining the functions of each pin. Expansion of the circuit to program the chip (Example shown in Figure 1). Making the chip work and including an example of programming to use this module with Arduino to give an overview of the development of the system, which is a system that is attractively priced.

(Figure. programmed chip used with ESP-01/ESP-01s)

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[EN] Arduino : ESP8266 GPIO

By jarutex November 11, 2021

In this article, we will learn about GPIO (General Purpose I/O) or pin connect to an external device of microcontroller with C++ of Arduino using esp8266 as reference chip. This can be applied to Arduino Uno, Arduino Mega or STM32 as well. Under this article, we describe the duty of the pin, output and the input signal.

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[EN] ESP8266WiFi

By jarutex November 9, 2021

This article is a compilation of information related to the ESP8266WiFi class, which performs the WiFi functionality of the ESP8266 microcontroller. This class can be accessed via a WiFi object, which is an object created for accessing the chip’s wireless module and must import a header file named ESP8266WiFi.h