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[EN] The MaixPy’s image class Part 1. draw and find something.

By jarutex December 25, 2021

This article discusses how to use image class with TFT-LCD display module of Sipeed M1W dock suit board via lcd class (MaixPy’s lcd class) as shown in Figure 1 provided with MaixPy to study the list of commands provided by image class and an example program using commands about creating a buffer object, clearing the value in the buffer, deleting the buffer, drawing straight lines, circles, squares, character display, saving data from the buffer to memory card (microSD Card), searching for straight lines in buffer (find_lines), finding circles in the buffer, find_circles and find squares (find_rects) in buffers with built-in functionality. It uses the Hough Transform principle to find the position and parameters of the searched object.

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[EN] How to used RPi 3.5″ TFT LCD&Touch Shield with esp32?

By jarutex December 24, 2021

Because we bought a 3.5″ display for the Raspberry Pi board to use and wonder if it can be used with the ESP32 board or not. Therefore, this article talks about how to use a TFT LCD Shield designed for Waveshare’s Raspberry Pi with the TTGO T8 ESP32 microcontroller via the TFT_eSPI library to display and operate a touch screen system as shown in Figure 1.

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[EN] The MaixPy’s lcd class.

By jarutex December 22, 2021

This article discusses the use of the Sipeed M1W dock suit’s TFT-LCD module via the lcd class (MaixPy’s lcd class) built into the MaixPy, a module that allows programmers to use it with the efficiency of that class is high.

(Figure. 1 Sipeed M1W dock Suit’s screen)

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[EN] Maix Class

By jarutex December 21, 2021

This article compiles a list of the classes that fall under the Maix class MaixPy, the MicroPython of the Sipeed M1W dock suit board (Figure 1) previously mentioned.

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[EN] Understand and use the ESP32-C3

By jarutex December 20, 2021

We have been using the esp8266, especially the esp-01 and esp-01s modules, to manage the sensor network for quite some time and with the limitation in terms of the number of pins used, the system must be designed to work with STM32F103C8T6 or STM32F401CCU6/STM32F411CEU6. To ensure stable operation, no problems with the esp8266’s WDT were encountered, and over time, espressif released several other microcontrollers such as esp32, esp32-s2, esp32-c3 and esp32-s3.

We have tested and used esp32 almost all the time until esp32-s2 with LILYGO board made us try to order it. The main problem is that the development tools are very late. However, as of now, espressif has released a development kit for Arduino or Arduino Core for ESP32 version 2.0 with support for esp32 esp32-s2 and esp32c3, making it work with ESP32 and ESP32-S2. We got the esp-c3-32s board so this article was born.

This article is compiled from the datasheet of ESP32-C3 WROOM-02, in this article we use the board as shown in Figure 1. The example program is to drive an RGB LED on the board to work by using Arduino Core for ESP32 and the improved ESP-IDF from the article in Ep. 3

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[EN] ESP-NOW

By jarutex December 19, 2021

The article discusses the use of communication developed by espressif to communicate between its microcontrollers via wireless communication, as an alternative to the development of a non-linear Client/Server system. It describes the working process of working as a service provider, commander, and a set of related instructions through the Arduino core, along with explaining the working examples that come with both Arduino cores, which are basic and Multi-slave, which can be applied variously.

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[EN] ESP-IDF Ep.3 : GPIO Output

By jarutex December 17, 2021

This article discusses setting the GPIO and sending the digital status 0 or 1 to the port, starting with the LED on and off by connecting to the external LED circuit of the board as shown in Figure 1.

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[EN] ST7735s

By jarutex December 16, 2021

This article describes setting up the Arduino’s TFT_eSPI library to use the ST7735s-controlled TFT LCD that was written as an example in a previous article in Python. We found that there are 2 0.96″ LCD IPS ST7735s models, which are GREENTAB160x80 and REDTAB160x80. Both modules differ in the spacing between them, as shown in Figure 1. This article uses the ESP8266, ESP32 DO-IT DevKit version with ESP32CAM and STM32F103C8T6. It is a board to test the functionality of the program.

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[EN] Improve st7735 blue-tab/red-tab 0.96 ” library

By jarutex December 15, 2021

This article is an update of the st7735 library file for Micropython by Billy Cheung (accessed 2021-09-07) published on github. It is a library that has been updated by Guy Caver to support ST7735s. The required libraries include st7735.py and sysfont.py Guy Carver implements esp8266 and esp32 to provide better display speed through the principle of display buffering for pixel storage and additional instructions for sending data from buffer to TFT module via SPI bus.

(Figure. 1 dCore-miniML board with ST7735 0.96″ display module installed)

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[EN] MicroPython : PWM

By jarutex December 14, 2021

This article discusses the use of PWM or Pulse Width Modulation modules under the machine class of MicroPython for esp8266 and esp32, along with an example of using PWM to dim the brightness of an LED and the generation of audio frequencies with PWM, which can be applied in the future.