Arduino

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Note: This product uses USB to connect Type-C, if there is a situation where the chip information cannot be output, please modify the Serial.print function in the code to "printf" function to output directly to the USB.

LCD Description

LCD & Controller

• The built-in controller of this LCD is ST7789V2, which is an LCD controller with 240 × RGB × 320 pixels, and the pixels of this LCD are 240(H) × RGB × 280(V), so you can see the internal RAM of this LCD is not fully used.
• The LCD supports 12-bit, 16-bit, and 18-bit per pixel input color formats, i.e., RGB444, RGB565, and RGB666, and this demo uses the RGB565 color format, which is also the commonly used RGB format.
• The LCD adopts the 4-wire SPI communication interface, which can greatly reduce GPIO ports and the communication speed is faster.
• The resolution of this module is 240(H) × RGB × 280(V). As its four corners are round (#Dimensions), some of the input images will be partially undisplayed.

Communication Protocol

Note: The difference from the traditional SPI protocol is that the data line sent from the slave to the host is hidden because it only needs to be displayed. Please refer to Datasheet Page 66 for the table.
RESX is reset, it is pulled low when the module is powered on, usually set to 1;
CSX is the slave chip select, and the chip will be enabled only when CS is low.
D/CX is the data/command control pin of the chip, when DC = 0, write command, when DC = 1, write data.
SDA is the transmitted data, that is, RGB data;
SCL is the SPI communication clock.
For SPI communication, data is transmitted with timing, that is, the combination of clock phase (CPHA) and clock polarity (CPOL):
The level of CPHA determines whether the serial synchronization clock is collected on the first clock transition edge or the second clock transition edge. When CPHA = 0, data acquisition is performed on the first transition edge;
The level of CPOL determines the idle state level of the serial synchronous clock. CPOL = 0, which is a low level.
As can be seen from the figure, when the first falling edge of SCLK starts to transmit data, 8-bit data is transmitted in one clock cycle, using SPI0, bit-by-bit transmission, high-order first, and low-order last.

Sample Demo

Library Installation

When using the LVGL library, you need to modify the configuration of the corresponding screen, it is recommended to directly use the "lib" library in the sample demo. Copy the library folder to the C:\Users\xxxxx\Documents\Arduino\libraries directory, and note that xxxx represents the user name of your computer.

ST7789V2 Screen Example

Arduino

The provided lib is in "lib\TFT_eSPI_Setups\Setup208_ST7789.h", and you can set the parameters.
Open Arduino IDE, and click on File -> Examples -> TFT_eSPI (in the customization library at the bottom) -> Test and diagnostics -> Colour_Test demo, then compile and upload.

ESP-IDF

Provides esp-idf-st7789 example of ESP-IDF driver ST7789V2.
Required ESP-IDF version is ESP-IDF V5.x.

Arduino

LVGL (Light and Versatile Graphics Library) is a free and open-source graphics library designed for embedded systems and is ideal for use on resource-limited devices such as the ESP32-S3. In the sample demo, you can use LVGL_Arduino to quickly verify the screen effect.

LVGL Usage

When developing with the LVGL framework, you can call the components according to the component descriptions provided by LVGL8.3 Documents.
The following is LVGL example in the Arduino IDE.

Customized Button PWR_Key

This function button is designed to solve the problem of peripheral buttons with fewer functions, the working principle is as follows:
After pressing the PWR can make the battery power supply, at this time the system starts, the system should be defined GPIO35 continuous output high level to maintain the effect of the power-up, at this time to release the PWR will not power-off. PWR at this time the function that can be pulled down GPIO36, the system detects the GPIO36 pressed, continuous press and long press, you can customize the shutdown control operation, such as long press mode the system to set the GPIO35 low level Disconnect the battery power supply, you can complete the multi-function button use.

Voltage Divider

The board is reserved for voltage divider, use GPIO1 to read the analog value and learn the battery voltage through the voltage divider formula.

PCF85063 RTC Clock Chip

PCF85063 RTC clock provides functions such as timed tasks, accurate time tracking, and low-power wake-up and so on.
The RTC function can be easily enabled with the sample demo.

QMI8658 6-Axis IMU

QMI8658 provides applications such as posture detection, gait analysis, fall detection, and so on. Also, you can integrate it into your smart wearable devices.
You can verify multi-axis acceleration change through the sample demo, and the data can be observed directly through the view meter.

Buzzer Function

Timed tasks, timed alarms and other applications can be realized by combining RTC.

Resource

Document

• Schematic
• ESP-IDF Website
• arduino-esp32
• ESP32 Arduino Core’s documentation
• MicroPython Development Tutorial

3D Drawing

• ESP32-S3-LCD-1.69 3D PDF
• ESP32-S3-LCD-1.69 3D STP

Datasheet

• ST7789V2 datasheet
• QMI8658C datasheet
• PCF85063A datasheet

Demo

• Sample demo
  

Software

• Image2Lcd
• Image Extraction
• Zimo221.7z
• Ink Screen Font Library Tutorial

FAQ

Support

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