EBYTE E32R40T-E32N40T 4.0inch Micro Python Instructions

EBYTE E32R40T-E32N40T 4.0inch Micro Python

Product Specifications

• Module: 4.0-inch ESP32-32E display module
• Resolution: 320×480 pixels
• Screen Driver IC: ST7796
• Main Controller: ESP32-WROOM-32E
• Main Frequency: 240MHz
• Wireless Connectivity: 2.4G WIFI, Bluetooth
• Thonny Version: 4.1.6
• MicroPython Firmware Version: 1.24.1

Software and hardware platform description

• Module: 4.0-inch ESP32-32E display module with 320×480 resolution and ST7796 screen driver IC.
• Module master: ESP32-WROOM-32E module, the highest main frequency 240MHz, support 2.4G WIFI+ Bluetooth.
• Thonny version: 4.1.6
• ESP32 MicroPython firmware version: 1.24.1.

 Pin allocation instructions

The main controller of the 4.0-inch ESP32 display module is ESP32-32E, and the GPIO allocation for its onboard peripherals is shown in the table below:

Table 2.1 Pin allocation instructions for ESP32-32E onboard peripherals

 Instructions for the example program

Set up ESP32 MicroPython development environment
For detailed instructions on setting up the “MicroPython_development_environment_construction_for_ESP32”, please refer to the document.

Upload files
After the development environment is set up, the relevant files need to be uploaded to the ESP32 device in order to run the testing program.
Before uploading the file, please familiarize yourself with the directory contents of the MicroPython sample program. Open the “1-示例程序_Demo\MicroPython” directory in the package, as shown in the following figure:

The contents of each folder are described as follows:

• BMP: Stores BMP format images that sample programs need to use.
  • demos: Contains sample programs
  • firmware: Stores MicroPython firmware (needs to be burned when setting up the development environment)
• Font: Stores the Chinese and English character modulo data that the sample program needs to use.
  libraries: Stores MicroPython library files that sample programs need to use

• Connect the ESP32 display module to the computer and power it on using a USB cable.
• Open the Thonny software and configure the MicroPython interpreter for ESP32, as shown in the following figure: (If already configured, this step can be omitted)
• Click the toolbarbutton to connect the ESP32 device. If the following prompt appears in the shell information bar, it indicates that the device connection is successful.
• Click the “View ->Files” button to open the file window (ignore this operation if it is already open). Find the “1-示例程序_Demo\MicroPython” directory in the package in the window, left click the mouse to select the target file in the directory, and right-click on the standalone mouse to select “Upload to /” to upload the target file. As shown in the following figure:
  Please note that when uploading files, ESP32 cannot run any programs, otherwise the upload will fail
• Upload the files from the “BMP”, “Font”, and “libraries” directories to the ESP32 device using the above method. The files in the ‘demos’ directory can be transferred or not. As shown in the following figure:

Example Program Usage Instructions
The sample program is located in the “1-示例程序_Demo\MicroPython\demos” directory of the package, as shown in the following: figure:

The sample program can be uploaded to an ESP32 device to open and run, or it can be opened and run on a local computer. If you need to power on the ESP32 display module to run automatically, you need to change the sample program name to “main. py” and upload it to the ESP32 display module.

In the Python software, open the target sample program, click the menu bar button, and you can run it. If the operation fails, the ESP32 device needs to be reconnected.

The introduction of each example program is as follows:

• BMP_test.py
  This example program relies on the ST7796.py library to display images in BMP format
• font_test.py
  This example program relies on the ST7796.py library to display Chinese and English characters of various sizes. The font modeling data needs to be saved in the font file according to the relevant format. For instructions on character casting, please refer to the following website: http://www.lcdwiki.com/Chinese_and_English_display_modulo_settings
• graphical_test.py
  This example program relies on the ST7796.py library to display graphics such as points, lines, rectangles, rounded rectangles, triangles, circles, ellipses, etc. for drawing and filling, as well as setting display orientation.
• Read_ID_GRAM.py
  This example program relies on the ST7796.py library to display LCD ID and RGAM color value readings.
• RGB_LED.py
  This example hardware requires the use of RGB tri color lights to display the on/off and brightness adjustment of the RGB tri color lights.
• Simple_test.py
  This example does not rely on any software libraries and displays simple screen scrolling content.
• Touch_Calibrate.py
  This example relies on the ST7796.py library and the touch.exe library, displaying the calibration of a resistive touch screen. Follow the prompts displayed on the screen. After calibration is completed, the calibration parameters are output through the serial port and copied to the initialization of the sample program. Please note that the touch screen should be calibrated according to the display direction. The display direction in this program can be modified, as shown in the following figure:

Touch_Pen.py
This example relies on the ST7796.py library and the touch.exe library, displaying the operation of drawing dots and lines on the touch screen.

Frequently Asked Questions

• Q: How do I reset the ESP32-32E module?
  A: Press the RESET_KEY button, which is shared with the LCD screen reset, to perform a low-level reset.
• Q: What is the power interface for the module?
  A: The module features a Type-C power interface that is connected to a 5V voltage source.