Features​

• Equipped with a high-performance Xtensa® 32-bit LX7 dual-core processor clocked at up to 240MHz
• Supports 2.4GHz Wi-Fi and Bluetooth 5 (LE), with built-in antenna
• Built-in 512KB SRAM, 384KB ROM, stacked with 16MB Flash and 8MB PSRAM integrated
• Equipped with a 4.2inch fully reflective screen with a resolution of 300 × 400, featuring characteristics of reflection imaging and no backlight required
• Equipped with a dual-microphone array for audio algorithms such as noise reduction and echo cancellation, suitable for accurate speech recognition and near-field/far-field wake-up applications
• Onboard PCF85063 RTC real-time clock and SHTC3 temperature and humidity sensor for precise RTC time management and temperature and humidity monitoring
• Onboard 18650 lithium battery holder and RTC backup battery holder (requires a rechargeable RTC battery), supporting dual modes of main power supply and independent RTC power backup
• Built-in TF card slot, supports external storage of images or files
• Onboard KEY and BOOT two side buttons with customizable functions, allowing for custom function development
• Reserved 2 × 8 female header interface (2.54mm pitch) for convenient external expansion

Onboard Resources​

1. ESP32-S3-WROOM-1-N16R8 Wi-Fi and Bluetooth SoC, up to 240MHz operating frequency, stacked with 16MB Flash and 8MB PSRAM
2. ES7210 ADC chip implements echo cancellation circuit
3. ES8311 Low power audio codec IC
4. BOOT Button Press and hold the BOOT button to power on again to enter download mode
5. PWR Button Long press to power off, single click to power on
6. KEY Button Customizable function button
7. SHTC3 Temperature and Humidity Sensor Provides ambient temperature and humidity measurement, enabling environmental monitoring function
8. PCF85063 RTC clock chip, supporting time-keeping functionality
9. MX1.25 2PIN Speaker Interface Audio signal output, for connecting external speaker
10. RTC Independent Power Interface Supports only PH1.0 rechargeable RTC battery
11. 2 × 8PIN 2.54mm Pitch Female Header
12. 18650 Battery Holder
13. Dual Microphone Array Design Dual microphone array with ES7210 for echo cancellation
14. CHG Charging Indicator Light The light turns off when the battery is fully charged
15. WRN Warning Indicator Light The light stays on if the battery is reverse-connected
16. Type-C Interface Used for program flashing and log printing
17. TF Card Slot Supports FAT32-formatted TF card for data expansion

Interfaces​

Dimensions​

This chapter contains the following sections. Please read as needed:

• Arduino Getting Started
• Setting Up the Development Environment
• Example

Arduino Getting Started

New to Arduino ESP32 development and looking for a quick start? We have prepared a comprehensive Getting Started Tutorial for you.

• Section 0: Getting to Know ESP32
• Section 1: Installing and Configuring Arduino IDE
• Section 2: Arduino Basics
• Section 3: Digital Output/Input
• Section 4: Analog Input
• Section 5: Pulse Width Modulation (PWM)
• Section 6: Serial Communication (UART)
• Section 7: I2C Communication
• Section 8: SPI Communication
• Section 9: Wi-Fi Basics
• Section 10: Web Server
• Section 11: Bluetooth
• Section 12: LVGL GUI Development
• Section 13: Comprehensive Project

Note: This tutorial uses the ESP32-S3-Zero as a reference example, and all hardware code is based on its pinout. Before you start, we recommend checking the pinout of your development board to ensure the pin configuration is correct.

Setting Up the Development Environment​

1. Installing and Configuring the Arduino IDE​

Please refer to the tutorial Installing and Configuring Arduino IDE to download and install the Arduino IDE and add ESP32 support.

2. Installing Libraries​

• When installing Arduino libraries, there are typically two methods: Install Online and Install Offline. If the library installation requires Install Offline, you must use the provided library file.
• For most libraries, users can easily search for and install them via the Arduino IDE's online Library Manager. However, some open-source or custom libraries are not synchronized to the Arduino Library Manager and therefore cannot be found through online search. In this case, users can only install these libraries manually via offline methods.
• The example program package for the ESP32-S3-RLCD-4.2 development board can be downloaded from here. The Arduino\libraries directory within the package already contains all the library files required for this tutorial.

3. Arduino Project Parameter Settings​

Example​

The Arduino examples are located in the Arduino/examples directory of the example package.

01_WIFI_AP​

Example Description

• This example can set the development board as a hotspot, allowing phones or other devices in STA mode to connect to the development board.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

*In the file 01_WIFI_AP.ino, find ssid and password, then a phone or other device in STA mode can connect to the development board using these ssid and password.

const char *ssid = "ESP32_AP";
const char *password = "12345678";

Operation Result

• After flashing the program, open the Serial Terminal. If a device successfully connects to the hotspot, the MAC address of that device will be output, as shown:

  

02_WIFI_STA​

Example Description

• This example configures the development board as a STA device to connect to a router, thereby accessing the system network.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• In the file 02_WIFI_STA.ino, find ssid and password, then modify them to the SSID and Password of an available router in your current environment.

  const char *ssid = "you_ssid";
  const char *password = "you_password";
  

Operation Result

• After flashing the program, open the Serial Terminal. If the device successfully connects to the hotspot, the obtained IP address will be output, as shown in the figure:

  

03_ADC_Test​

Example Description

• The analog voltage connected through the GPIO is converted to digital by the ADC, and then the actual lithium battery voltage is calculated and printed to the terminal.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• Adc_PortInit(void): Initializes ADC1, including creating an ADC one-time trigger unit and configuring channel 3 for ADC1
• float Adc_GetBatteryVoltage(int *data): Reads the value from ADC1 channel 3 and returns the actual voltage value.
• uint8_t Adc_GetBatteryLevel(void): Returns the battery percentage.
• void Adc_LoopTask(void *arg): Creates an ADC task that reads the ADC value and prints it to the serial port every second.

Operation Result

• After the program is compiled and downloaded, you can view the printed ADC values and voltage output by opening the Serial Monitor, as shown in the following image:

  

04_I2C_PCF85063​

Example Description

• Through the I2C protocol, initialize the PCF85063 chip, set the time, and then periodically read the time and print it to the terminal

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

I2cMasterBus I2cbus(14,13,0);          // Initialize I2C bus
void setup() {
Serial.begin(115200);
delay(1000);
Serial.printf("rtc-example run \n"); 
Rtc_Setup(&I2cbus, 0x51);              // Initialize RTC, set RTC slave address to 0x51
Rtc_SetTime(2025, 9, 9, 20, 15, 30);   // Set RTC time
}

void loop() {
  rtcTimeStruct_t rtcData;
  Rtc_GetTime(&rtcData);              // Get the real-time clock (RTC) time
  Serial.printf("%d/%d/%d %02d:%02d:%02d \n",
                rtcData.year, rtcData.month, rtcData.day, rtcData.hour, rtcData.minute,
                rtcData.second);
  delay(1000);
}

Operation Result

• After the program is compiled and downloaded, open the serial port monitoring to see the RTC time of the printout, as shown in the following figure:
  

  

05_I2C_SHTC3​

Example Description

• Initialize the SHTC3 chip through the I2C protocol, and then print the temperature and humidity information read every 1 second to the terminal

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

I2cMasterBus I2cbus(14,13,0);
Shtc3Port *shtc3port = NULL;

void setup() {
  Serial.begin(115200);
  delay(1000);
  Serial.printf("shtc3-example run \n");
  shtc3port = new Shtc3Port(I2cbus);         // Initialize SHTC3
}

void loop() {
  float rh,temp;
  shtc3port->Shtc3_ReadTempHumi(&temp,&rh);  // Get temperature and humidity data
  Serial.printf("RH:%.2f%%,Temp:%.2f° \n",rh,temp);
  delay(1000);
}

Operation Result

• Open the serial port monitor, you can see the printed temperature and humidity data, as shown in the figure below:

  

06_SD_Card​

Example Description

• Drive the TF card through SDMMC, and print the TF card information to the terminal after successfully mounting.

Hardware Connection

• Install a FatFs-formatted TF card into the board before powering on

Code Analysis

#define sdcard_write_Test                  

CustomSDPort *sdcardPort = NULL;

void setup()
{
  Serial.begin(115200);
  delay(2000);
  sdcardPort = new CustomSDPort("/sdcard");  // Initialize SDMMC driver
}

uint32_t value = 1;
char sdcard_read[45] = {""};
char sdcard_write[45] = {""};

void loop()
{
#ifdef sdcard_write_Test      // Test the TF card read/write functionality
  snprintf(sdcard_write,45,"sdcard_writeTest : %ld \n",value);
  sdcardPort->SDPort_WriteFile("/sdcard/writeTest.txt",sdcard_write,strlen(sdcard_write));
  vTaskDelay(pdMS_TO_TICKS(500));
  sdcardPort->SDPort_ReadFile("/sdcard/writeTest.txt",(uint8_t *)sdcard_read,NULL);
  Serial.printf("read data:%s\n",sdcard_read);
  vTaskDelay(pdMS_TO_TICKS(500));
  value++;
#endif
}

Operation Result

• Click on the serial port monitoring device, you can see the output information of the TF card, as shown in the figure below:

  

07_Audio_Test​

Example Description

• Demonstrates how to get data from the microphone and then play it through the speaker

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• CodecPort_SetInfo("es8311 & es7210",1,16000,2,16): Sets the sampling rate, number of channels, and bit depth of the Codec chip.
• CodecPort_SetSpeakerVol(100): Set the playback gain to 100.
• CodecPort_SetMicGain(35): Set the microphone gain to 35.
• Codec_LoopTask(void *arg): Codec task, which implements recording, playback, and other functions.

Operation Result

• After the program is flashed, as shown in the figure:

  

  TIP

  1. Double-click the BOOT button to enter recording mode, speak into the MIC, and it will automatically end after 3 seconds
  2. Click the BOOT button to play the sound you just recorded
  3. Double-click the KEY button to play a piece of music
  4. Click the KEY button to interrupt music playback

08_LVGL_V8_Test​

Example Description

• Demonstrates how to display images using LVGL V8, helping users get started quickly with LVGL V8.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

/*Create an IMG1 widget */
ui->screen_img_1 = lv_img_create(ui->screen);
lv_obj_add_flag(ui->screen_img_1, LV_OBJ_FLAG_CLICKABLE);
lv_img_set_src(ui->screen_img_1, &_ein_alpha_400x300);
lv_img_set_pivot(ui->screen_img_1, 50,50);
lv_img_set_angle(ui->screen_img_1, 0);
lv_obj_set_pos(ui->screen_img_1, 0, 0);
lv_obj_set_size(ui->screen_img_1, 400, 300);
/*Create an IMG2 widget */
ui->screen_img_2 = lv_img_create(ui->screen);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_CLICKABLE);
lv_img_set_src(ui->screen_img_2, &_2_alpha_400x300);
lv_img_set_pivot(ui->screen_img_2, 50,50);
lv_img_set_angle(ui->screen_img_2, 0);
lv_obj_set_pos(ui->screen_img_2, 0, 0);
lv_obj_set_size(ui->screen_img_2, 400, 300);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_HIDDEN);

Operation Result

• After the program is flashed, it is displayed alternately at intervals of 1.5 seconds, as shown in the figure:

  

09_LVGL_V9_Test​

Example Description

• Demonstrates how to display images using LVGL V9, helping users get started quickly with LVGL V9.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

/*Create an IMG1 widget */
ui->screen_img_1 = lv_image_create(ui->screen);
lv_obj_set_pos(ui->screen_img_1, 0, 0);
lv_obj_set_size(ui->screen_img_1, 400, 300);
lv_obj_add_flag(ui->screen_img_1, LV_OBJ_FLAG_CLICKABLE);
lv_image_set_src(ui->screen_img_1, &_ein_RGB565A8_400x300);
lv_image_set_pivot(ui->screen_img_1, 50,50);
lv_image_set_rotation(ui->screen_img_1, 0);
/*Create an IMG2 widget */
ui->screen_img_2 = lv_image_create(ui->screen);
lv_obj_set_pos(ui->screen_img_2, 0, 0);
lv_obj_set_size(ui->screen_img_2, 400, 300);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_HIDDEN);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_CLICKABLE);
lv_image_set_src(ui->screen_img_2, &_2_RGB565A8_400x300);
lv_image_set_pivot(ui->screen_img_2, 50,50);
lv_image_set_rotation(ui->screen_img_2, 0);

Operation Result

• After the program is flashed, it is displayed alternately at intervals of 1.5 seconds, as shown in the figure:

  

10_U8G2_Test​

Example Description

• Completes the porting of the U8G2 library, supporting fast screen refreshing, helping users precisely target product functions and display effects.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

u8g2_clearBuffer();     // Clear screen
u8g2_setFont();         // Set font
u8g2_drawStr();         // Draw counter and text
u8g2_drawFrame();       // Draw border
u8g2_drawHLine();       // Draw bottom separator line
u8g2_sendBuffer();      // Refresh screen
u8g2_drawPixel(x, y);   // Draw a pixel
u8g2_drawLine(x1, y1, x2, y2);    // Draw an arbitrary line
u8g2_drawBox(x, y, w, h);         // Filled rectangle
u8g2_drawCircle(x, y, r);         // Hollow circle
u8g2_drawDisc(x, y, r);           // Filled circle
u8g2_drawTriangle(x0, y0, x1, y1, x2, y2); // Filled triangle
u8g2_drawXBMP(x, y, w, h, bitmap); // Draw XBM format monochrome bitmap
u8g2_drawBitmap(x, y, cnt, h, bitmap); // Draw U8g2 bitmap

Operation Result

• After the program is flashed, the screen displays as shown:

  

This chapter contains the following sections. Please read as needed:

• ESP-IDF Getting Started
• Setting Up the Development Environment
• Example

ESP-IDF Getting Started​

New to ESP32 ESP-IDF development and looking to get started quickly? We have prepared a general Getting Started Tutorial for you.

• Section 1: Environment Setup
• Section 2: Running Examples
• Section 3: Creating a Project
• Section 4: Using Components
• Section 5: Debugging
• Section 6: FreeRTOS
• Section 7: Peripherals
• Section 8: Wi-Fi Programming
• Section 9: BLE Programming

Please Note: This tutorial uses the ESP32-S3-Zero as a teaching example, and all hardware code is based on its pinout. Before you start, it is recommended that you check the pinout of your development board to ensure the pin configuration is correct.

Setting Up the Development Environment​

Install the ESP-IDF Development Environment​

1. Download the installation manager from the ESP-IDF Installation Manager page. This is Espressif's latest cross-platform installer. The following steps demonstrate how to use its offline installation feature.

   Click the Offline Installer tab on the page, then select Windows as the operating system and the ESP-IDF version you need (the version shown in the screenshot is for reference only — choose the version that fits your actual needs).

   

   After confirming your selection, click the download button. The browser will automatically download two files: the ESP-IDF Offline Package (.zst) and the ESP-IDF Installer (.exe).

   

   Please wait for both files to finish downloading.

2. Once the download is complete, double-click to run the ESP-IDF Installer (eim-gui-windows-x64.exe).

   The installer will automatically detect if the offline package exists in the same directory. Click Install from archive.

   

   Next, select the installation path. We recommend using the default path. If you need to customize it, ensure the path does not contain Chinese characters or spaces. Click Start installation to proceed.

   

3. When you see the following screen, the ESP-IDF installation is successful.

   

4. We recommend installing the drivers as well. Click Finish installation, then select Install driver.

   

Install Visual Studio Code and the ESP-IDF Extension​

1. Download and install Visual Studio Code.

2. During installation, it is recommended to check Add "Open with Code" action to Windows Explorer file context menu to facilitate opening project folders quickly.

3. In VS Code, click the Extensions icon  in the Activity Bar on the side (or use the shortcut Ctrl + Shift + X) to open the Extensions view.

4. Enter ESP-IDF in the search box, locate the ESP-IDF extension, and click Install.

   

5. For ESP-IDF extension versions ≥ 2.0, the extension will automatically detect and recognize the ESP-IDF environment installed in the previous steps, requiring no manual configuration.

Example​

The ESP-IDF examples are located in the ESP-IDF directory of the example package.

01_WIFI_AP​

Example Description

• This example can set the development board as a hotspot, allowing phones or other devices in STA mode to connect to the development board.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• In the file softap_example_main.c, find SSID and PASSWORD, and then your phone or other device in STA mode can use the SSID and PASSWORD to connect to the development board.

  #define EXAMPLE_ESP_WIFI_SSID      "waveshare_esp32"
  #define EXAMPLE_ESP_WIFI_PASSWORD      "wav123456"
  

Operation Result

• After flashing the program, open the Serial Terminal. If a device successfully connects to the hotspot, it will output the device's MAC address and IP address, as shown in the figure:

  

02_WIFI_STA​

Example Description

• This example configures the development board as a STA device to connect to a router, thereby accessing the system network.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• In the file esp_wifi_bsp.c, find ssid and password, then modify them to the SSID and Password of an available router in your current environment.

  wifi_config_t wifi_config = {
    .sta = {
    	.ssid = "PDCN",
    	.password = "1234567890",
    },
  };
  

Operation Result

• After flashing the program, open the Serial Terminal. If the device successfully connects to the hotspot, the obtained IP address will be output, as shown in the figure:

  

03_ADC_Test​

Example Description

• The analog voltage connected through the GPIO is converted to digital by the ADC, and then the actual lithium battery voltage is calculated and printed to the terminal.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• Adc_PortInit(void): Initializes ADC1, including creating an ADC one-time trigger unit and configuring channel 3 for ADC1
• float Adc_GetBatteryVoltage(int *data): Reads the value from ADC1 channel 3 and returns the actual voltage value.
• uint8_t Adc_GetBatteryLevel(void): Returns the battery percentage.
• void Adc_LoopTask(void *arg): Creates an ADC task that reads the ADC value and prints it to the serial port every second.

Operation Result

• After the program is compiled and downloaded, you can view the printed ADC values and voltage output by opening the Serial Monitor, as shown in the following image:

  

04_I2C_PCF85063​

Example Description

• Through the I2C protocol, initialize the PCF85063 chip, set the time, and then periodically read the time and print it to the terminal

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• void Rtc_LoopTask(void *arg): Create an RTC task to implement the RTC function, read the clock of the RTC chip every 1 second, and then output it to the terminal.

Operation Result

• After the program is compiled and downloaded, open the serial port monitoring to see the RTC time of the printout, as shown in the following figure:
  

  

05_I2C_STHC3​

Example Description

• Initialize the SHTC3 chip through the I2C protocol, and then print the temperature and humidity information read every 1 second to the terminal

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• void Shtc3_LoopTask(void *arg): Create a SHTC3 sensor task that obtains temperature and humidity at intervals of 1 second.

Operation Result

• Open the serial port monitor, you can see the printed temperature and humidity data, as shown in the figure below:

  

06_SD_Card​

Example Description

• Drive the TF card through SDMMC, and print the TF card information to the terminal after successfully mounting.

Hardware Connection

• Install a FatFs-formatted TF card into the board before powering on

Code Analysis

• Fatfs_LoopTask(void *arg): A task to test TF card read and write functionality. You need to uncomment the #define sdcard_write_Test macro definition.

Operation Result

• Click on the serial port monitoring device, you can see the output information of the TF card, as shown in the figure below:

  

07_Audio_Test​

Example Description

• Demonstrates how to get data from the microphone and then play it through the speaker

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

• CodecPort_SetInfo("es8311 & es7210",1,16000,2,16): Sets the sampling rate, number of channels, and bit depth of the Codec chip.
• CodecPort_SetSpeakerVol(100): Set the playback gain to 100.
• CodecPort_SetMicGain(35): Set the microphone gain to 35.
• Codec_LoopTask(void *arg): Codec task, which implements recording, playback, and other functions.

Operation Result

• After the program is flashed, as shown in the figure:

  

  TIP

  1. Double-click the BOOT button to enter recording mode, speak into the MIC, and it will automatically end after 3 seconds
  2. Click the BOOT button to play the sound you just recorded
  3. Double-click the KEY button to play a piece of music
  4. Click the KEY button to interrupt music playback

08_LVGL_V8_Test​

Example Description

• Demonstrates how to display images using LVGL V8, helping users get started quickly with LVGL V8.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

/*Create an IMG1 widget */
ui->screen_img_1 = lv_img_create(ui->screen);
lv_obj_add_flag(ui->screen_img_1, LV_OBJ_FLAG_CLICKABLE);
lv_img_set_src(ui->screen_img_1, &_ein_alpha_400x300);
lv_img_set_pivot(ui->screen_img_1, 50,50);
lv_img_set_angle(ui->screen_img_1, 0);
lv_obj_set_pos(ui->screen_img_1, 0, 0);
lv_obj_set_size(ui->screen_img_1, 400, 300);
/*Create an IMG2 widget */
ui->screen_img_2 = lv_img_create(ui->screen);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_CLICKABLE);
lv_img_set_src(ui->screen_img_2, &_2_alpha_400x300);
lv_img_set_pivot(ui->screen_img_2, 50,50);
lv_img_set_angle(ui->screen_img_2, 0);
lv_obj_set_pos(ui->screen_img_2, 0, 0);
lv_obj_set_size(ui->screen_img_2, 400, 300);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_HIDDEN);

Operation Result

• After the program is flashed, it is displayed alternately at intervals of 1.5 seconds, as shown in the figure:

  

09_LVGL_V9_Test​

Example Description

• Demonstrates how to display images using LVGL V9, helping users get started quickly with LVGL V9.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

/*Create an IMG1 widget */
ui->screen_img_1 = lv_image_create(ui->screen);
lv_obj_set_pos(ui->screen_img_1, 0, 0);
lv_obj_set_size(ui->screen_img_1, 400, 300);
lv_obj_add_flag(ui->screen_img_1, LV_OBJ_FLAG_CLICKABLE);
lv_image_set_src(ui->screen_img_1, &_ein_RGB565A8_400x300);
lv_image_set_pivot(ui->screen_img_1, 50,50);
lv_image_set_rotation(ui->screen_img_1, 0);
/*Create an IMG2 widget */
ui->screen_img_2 = lv_image_create(ui->screen);
lv_obj_set_pos(ui->screen_img_2, 0, 0);
lv_obj_set_size(ui->screen_img_2, 400, 300);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_HIDDEN);
lv_obj_add_flag(ui->screen_img_2, LV_OBJ_FLAG_CLICKABLE);
lv_image_set_src(ui->screen_img_2, &_2_RGB565A8_400x300);
lv_image_set_pivot(ui->screen_img_2, 50,50);
lv_image_set_rotation(ui->screen_img_2, 0);

Operation Result

• After the program is flashed, it is displayed alternately at intervals of 1.5 seconds, as shown in the figure:

  

10_FactoryProgram​

Example Description

• The driver board integrates all hardware components and provides comprehensive examples, enabling users to quickly understand the product.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

sdcardPort = new CustomSDPort("/sdcard"); // Initialize sdcard
Adc_PortInit();                           // Initialize Adc
Custom_ButtonInit();                      // Initialize buttons
Rtc_Setup(&I2cbus,0x51);                  // Initialize RTC
Rtc_SetTime(2026,1,5,14,30,30);           // Set RTC time
shtc3port = new Shtc3Port(I2cbus);        // Initialize Shtc3
espwifi_init();                           // Initialize WiFi STA mode
CodecGroups = xEventGroupCreate();
codecport = new CodecPort(I2cbus,"S3_RLCD_4_2"); // Initialize Codec
codecport->CodecPort_SetInfo("es8311 & es7210",1,16000,2,16);
codecport->CodecPort_SetSpeakerVol(100);         // Set the speaker gain
codecport->CodecPort_SetMicGain(35);             // Set the microphone gain

Operation Result

• After the program is flashed, the main interface is displayed, as shown in the figure:

  

  TIP

  1. Long press the KEY button to enter the image display interface
  2. Long press the BOOT button to enter the music playback interface

• Image display interface, as shown in the figure:

  

  TIP

  1. Long press the KEY button to return to the main interface

• Music playback interface, as shown in the figure:

  

  TIP

  1. Double-click the BOOT button to enter recording mode, speak into the MIC, and it will automatically end after 3 seconds
  2. Click the BOOT button to play the sound you just recorded
  3. Double-click the KEY button to play a piece of music
  4. Click the KEY button to interrupt music playback
  5. Long press the BOOT button to go back to the interface

11_U8G2_Test​

Example Description

• Completes the porting of the U8G2 library, supporting fast screen refreshing, helping users precisely target product functions and display effects.

Hardware Connection

• Connect the board to the computer using a USB cable.

Code Analysis

u8g2_clearBuffer();     // Clear screen
u8g2_setFont();         // Set font
u8g2_drawStr();         // Draw counter and text
u8g2_drawFrame();       // Draw border
u8g2_drawHLine();       // Draw bottom separator line
u8g2_sendBuffer();      // Refresh screen
u8g2_drawPixel(x, y);   // Draw a pixel
u8g2_drawLine(x1, y1, x2, y2);    // Draw an arbitrary line
u8g2_drawBox(x, y, w, h);         // Filled rectangle
u8g2_drawCircle(x, y, r);         // Hollow circle
u8g2_drawDisc(x, y, r);           // Filled circle
u8g2_drawTriangle(x0, y0, x1, y1, x2, y2); // Filled triangle
u8g2_drawXBMP(x, y, w, h, bitmap); // Draw XBM format monochrome bitmap
u8g2_drawBitmap(x, y, cnt, h, bitmap); // Draw U8g2 bitmap

Operation Result

• After the program is flashed, the screen displays as shown:

  

XiaozhiAI (XiaoZhi AI) is an open-source AI voice chatbot project based on the ESP32 development board, aiming to bring the general intelligence of large language models (LLMs) to edge devices. It provides a software-hardware integrated solution supporting full-duplex voice conversations and IoT device control, dedicated to assisting developers in building highly customized physical AI agents quickly and at low cost.

This article demonstrates how to flash firmware for Waveshare ESP32 development boards that support XiaoZhi AI, covering two methods: flashing without a development environment (directly flashing precompiled firmware) and flashing with a development environment (compiling from source and flashing).

0. Firmware Flashing Process Reference​

1. Flashing Without a Development Environment​

1.1 Download Firmware from XiaoZhi Official GitHub​

1. Visit the XiaoZhi GitHub to download the firmware file for your device. Click Assets to expand the full file list:

   

2. Refer to the Flash Firmware Flashing and Erasing Tutorial to complete the firmware flashing.

1.2 Download Firmware from Waveshare GitHub​

1. Visit the Waveshare GitHub repository and download the appropriate firmware version for your needs:

   

2. Refer to the Flash Firmware Flashing and Erasing Tutorial to complete the firmware flashing.

2. Flashing with ESP-IDF Environment​

2.1 Download the Project from XiaoZhi GitHub​

Visit the XiaoZhi AI Chatbot repository to download the complete project code:

2.2 Environment Setup​

Refer to the ESP-IDF Environment Setup Tutorial to configure the development environment.

2.3 Configuration and Compilation​

1. Click  to select the target device. Choose the chip model corresponding to your development board (e.g., esp32s3):

   

   TIP

   When setting the target device, ESP-IDF will automatically configure the corresponding toolchain and libraries. This process may take some time, please be patient. For more details, please refer to the Official Documentation.

2. Click  to open the ESP-IDF terminal, then execute the command idf.py menuconfig to enter the configuration interface. Select Xiaozhi Assistant:

   

3. Select Board Type to choose the development board type:

   

4. Choose the product model corresponding to your development board:

   

5. Choose XiaoZhi-AI default display language:

   

   

6. Press the S key to save the configuration and exit. Then click the  to automatically complete compilation, flashing, and serial monitoring.

2.4 Start Network Provisioning​

1. Connect your phone or computer to the device's Wi-Fi hotspot: Xiaozhi-xxxxxx. After successful connection, the configuration page should automatically pop up. If not, manually open a browser and visit http://192.168.4.1.

2. On the network configuration page, select the Wi-Fi name you want to connect to (only 2.4G band is supported; to connect to an iPhone hotspot, enable Max Compatibility in your phone's system settings). The SSID will be auto-filled. Enter the password and click Connect to start connecting:

   

2.5 Add a New Device to the Management Console​

1. Ensure the device has successfully connected to the Internet. The device will then broadcast a 6-digit device verification code (you can wake the device again to replay the code).

2. Visit the XiaoZhi AI Console. If you haven't registered, complete the registration and log in:

   

   

   

3. Enter the 6-digit verification code. The device will automatically activate and appear on the Device Management page, ready for normal use.

4. Say the wake word "Hello XiaoZhi" to wake the device and start voice conversations.

5. ESP32-S3-Touch-AMOLED-1.8 Button Instructions:

   • BOOT button: Press to wake XiaoZhi
   • PWR button: Short press to power on; long press for more than 6 seconds to power off

   

3. XiaoZhi Resources​

• XiaoZhi AI Chatbot Encyclopedia
• XiaoZhi AI Chatbot FAQ

1. Hardware Resources​

• Development Board Design File

  • Schematic
  • Structure and dimensions

2. Technical Manuals​

• Official ESP32-S3 Chip Manuals

  • Datasheet
  • Technical Manual

• Datasheets

  • ST7305 Datasheet
  • ES8311 Datasheet
  • PCF85063 Datasheet
  • SHTC3 Datasheet

3. Waveshare Official Example​

• ESP32-S3-RLCD-4.2 Example (GitHub)

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