ESP32-S3 Development Board with RLCD Display 4.2″ without battery - Waveshare 33507

Description

Waveshare ESP32-S3 RLCD 4.2″ without battery version is an AIoT development board based on the ESP32-S3 microcontroller, designed for projects requiring low power consumption, wireless communication, and voice interaction. The integrated 4.2″ reflective RLCD display provides an e-paper-like reading experience while offering faster refresh performance.

The RLCD display with a resolution of 300 x 400 px operates in reflective mode and does not require a backlight, using ambient light instead. This solution is well suited for bright environments and low-power applications. The board uses an SPI interface to drive the display and is equipped with the ST7305 display driver.

The module is built around a dual-core Xtensa LX7 processor running at up to 240 MHz and supports 2.4 GHz Wi-Fi and Bluetooth 5 LE connectivity. Integrated audio circuits, a dual-microphone array, and a speaker enable AI Voice Interaction applications, including speech recognition and near-field and far-field voice interaction.

Onboard components include an SHTC3 temperature and humidity sensor, a PCF85063 RTC chip, and a TF card slot for storage expansion. Power management and charging circuits are present on the board; however, in this version, the 18650 lithium battery is not included. Power is supplied via the USB-C port or an external power source.

The board supports ESP-IDF and Arduino IDE environments and is intended for prototyping, learning, IoT projects, smart desktop devices, electronic calendars, and control systems.

1. ESP32-S3-WROOM-1-N16R8 - The SoC with Wi-Fi and Bluetooth, 240MHz main frequency, integrated with 16MB Flash and 8MB PSRAM
2. ES7210 - ADC chip for echo cancellation circuit
3. ES8311 - low-power audio codec chip
4. BOOT button - Press it when powering on to enter download mode
5. PWR button - long press to power off, short press to power on
6. KEY button - customizable for other functions
7. SHTC3 temperature and humidity sensor - provides ambient temperature and humidity measurement, enabling environmental monitoring function
8. PCF85063 - RTC chip with timekeeping function
9. MX1.25 2PIN speaker header - audio output signal, for connecting external speaker
10. RTC independent power supply header - supports PH1.0 rechargeable RTC Batt only
11. 2 x 8PIN 2.54mm pitch female header
12. 18650 Lithium Batt holder
13. Dual-microphone array design - dual-microphone array, paired with ES7210 to achieve echo cancellation
14. CHG charging indicator - off when fully charged
15. WRN warning indicator - stays on when Batt is reverse-connected
16. Type-C port - for program burning and log printing
17. TF card slot - supports FAT32 TF card for data expansion

Features

• Microcontroller: ESP32-S3, dual-core Xtensa LX7 up to 240 MHz
• Memory: 512 kB SRAM, 384 kB ROM, 16 MB Flash, 8 MB PSRAM
• Wireless connectivity: Wi-Fi 2.4 GHz, Bluetooth 5 LE
• Display: 4.2″ RLCD, reflective mode
• Display resolution: 300 x 400 px
• Grayscale: 2 levels
• Display interface: SPI
• Display driver: ST7305
• Display colors: black, white
• Audio: audio codec, dual microphones, speaker
• Sensors: SHTC3 temperature and humidity sensor
• RTC: PCF85063
• Memory card slot: TF
• Interfaces: USB, UART, I2C, GPIO
• Power supply: USB-C, support for 18650 battery (battery not included)
• Supported environments: ESP-IDF, Arduino IDE
• Applications: AI Voice Interaction, IoT, prototyping, smart devices
• Weight: 0.142 kg

Kit includes

• ESP32-S3-RLCD-4.2-EN board ×1
• Acrylic stand (2 pieces)
• 8Ω 2 W speaker MX1.25 2-pin
• Screwdriver