ESP32 miniature ornament

The main functional modules include:

ESP32-C3: As the main control chip, it is responsible for Wi-Fi connectivity, data processing, and display control.
Display module: It may use a TFT screen to display time, weather information, and indoor temperature and humidity data.
Temperature and humidity sensor: It communicates with the ESP32-C3 via the I2C interface to collect indoor environmental data in real time.
Time function: It obtains and displays accurate time via the network.

Functional modules:


ESP32-C3 Main control chip:

The core part is the ESP32-C3-WROOM-02 module, which is responsible for the control of the entire system and Wi-Fi communication.
Various functional pins are connected to peripheral devices, such as the I2C bus and SPI bus.
The USB interface is used for power supply and communication (the VBUS pin is connected to the U14 AMS1117-3.3 regulator to provide 3.3V power), and the USB_DP and USB_DN pins are used for data transmission.


I2C interface:

Used to connect the temperature and humidity sensor SHT40. The SCL and SDA pins are connected to 3.3V through 4.7kΩ pull-up resistors (R1 and R2).



SPI Interface:

Used to drive the display screen. LCD1 indicates the TFT display screen connected via the SPI bus. Relevant pins include SPI_SCLK, SPI_MOSI, SPI_RESET, SPI_DC, and SPI_CS.





Power Management Module:

U14 is an AMS1117-3.3 regulator, receiving a 5V voltage from the USB VBUS input, providing a stable 3.3V power supply to the ESP32-C3 and other peripheral devices.
Capacitors are used for filtering and power stabilization, ensuring the reliability of the system power supply.



Debug Interface:

This is a serial debugging interface. The TXD0 and RXD0 pins are used for communication with external devices, facilitating code debugging and program downloading.



Buttons and LEDs:

SW1 and SW2 are system buttons, used for reset and start functions respectively. Pull-up resistors and capacitors on the buttons are used for debouncing.
The LED indicator (LED3) is connected via a current-limiting resistor for status display.



The entire system can acquire ambient temperature and humidity data, display time and weather information, and communicate with external devices via the ESP32-C3 (e.g., to obtain weather information or perform OTA updates).
Software component:
Developed using the Arduino IDE, it's easy to get started and uses the following libraries.