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Electronic Calendar

Implement an electronic calendar using an ESP32-S3 module and a 4.2-inch e-ink screen.

Project Overview:
This project is an electronic calendar based on the ESP32-S3 microcontroller, featuring time and date display, temperature and humidity detection, and VOC monitoring.
Project Functions:
This design is an electronic calendar based on the ESP32-S3 microcontroller. In addition to its built-in e-ink screen display, it can also read temperature, humidity, time, and date data via a serial port connection to a serial debugging tool, and the time and date can be set via the serial port.
Project Parameters:

This design uses the AT24C02 memory chip, which can retain the set parameters even when the power is off;
this design uses a 4.2-inch e-ink screen display, which displays the time, date, temperature, humidity, and VOC value from top to bottom;
it selects the fully digital temperature and humidity sensor SHT40, which has a wide temperature measurement range and can meet general needs;
the SGP40 is a digital VOC (volatile organic compound) sensor, and combined with the VOC algorithm (part of the SGP40 VOC index driver package), the sensor signal can be directly used for indoor air quality assessment;
extended functions: SD card reader, ES8311 low-power mono audio codec, NS4150B audio power amplifier principle analysis (hardware description).


This project consists of the following parts: power supply, sensor, clock, e-ink screen display, main control, and voice recognition extension. This project mainly displays sensor and time information through an e-ink screen.
The power supply circuit uses a dual TYPE-C-16P
USB
interface as the power supply interface. One uses the corresponding USB data pin to connect to the corresponding USB pin on S3 (USBD+ IO20), (USBD- IO19), allowing direct USB use for downloading and debugging without conversion to serial signals. 5.1K pull-down resistors are added to the CC1 and CC2 pins for easy identification and configuration by different hosts. The other uses a CH340K converter to convert to a serial signal, which can also be used for downloading and debugging communication.
The ideal diode
LM66100 has an on-resistance of 79mΩ at 5V and a maximum continuous current of 1.5A.
Ideal diodes can achieve power switching with minimal voltage drop and prevent reverse power flow.
The LDO circuit
uses RT9193 and ME6217 to power audio and other circuits respectively; the discrete LDOs further reduce the impact of power supply noise on the audio circuit. The SHT40
sensor measures relative humidity from 0 to 100% and temperature from -40°C to 125°C, achieving a humidity accuracy of ±1.8% and a temperature accuracy of ±0.2°C. The SGP40 , an upgraded version of the SGP30, is a VOC sensor featuring ultra-low power consumption (average power consumption as low as 2.6 mA / 3.3V), fast startup (<60S), and no calibration required. Most importantly, it incorporates a powerful VOC algorithm that converts the less intuitive VOC concentration into a VOC index that clearly indicates air quality. The RX8025T clock utilizes a built-in 32.768 kHz temperature-compensated crystal oscillator (DTCXO) for high timing accuracy. It provides a clock output, which, when connected to the ESP32-S3 pin, offers a more reliable low-frequency clock source. D1 enables backup battery power for continued clock operation after power failure. The e-ink screen driver is based on the relevant circuit design from MicroSnow Electronics and can be adjusted according to the specific screen type. The main control section uses the ESP32-S3-WROOM-1-N16R8 module, which can be directly connected to the pins, greatly reducing the design of peripheral circuits. The audio expansion section references the LCSC C3 development board and the Zhengdian Atom S3 development board; its functionality has not yet been verified. The software code example program is written in Arduino and implements the use of the e-ink screen, various sensors, SD card, clock, and serial port. Demonstration and content are attached. Important Notes: In PCB design, the analog ground of the audio section must be separated from the digital ground . The SHT40 is sensitive to heat sources; during layout, keep it as far away as possible from circuits that may generate heat, and avoid copper pours to reduce heat transfer. (See attached diagram.)