The ESP32-S3-RLCD-4.2 is a RLCD AIoT development board based on ESP32-S3, supporting Wi-Fi and BLE dual-mode communication. Onboard 4.2inch RLCD with low power consumption, e-paper-like display experience, and faster refresh response. Integrated with audio codec circuit, dual microphones, speaker, SHTC3 high-precision temperature and humidity sensor, TF card slot, RTC header, and Lithium Batt charging and discharging management circuit, etc. Reserved USB, UART, I2C, and multiple GPIO interfaces for easy expansion. Supports AI Voice Interaction, temperature and humidity monitoring, and IoT control, making it suitable for DIY desktop smart ornaments, electronic calendars, AI smart devices, and other applications. Also ideal for product prototyping.

• Adopts high-performance Xtensa 32-bit LX7 dual-core processor, up to 240MHz main frequency

• Supports 2.4GHz Wi-Fi and Bluetooth 5 (LE), with onboard antenna

• Built-in 512KB Static RAM, 384KB ROM, with integrated 16MB Flash and 8MB PSRAM

• Onboard 4.2inch RLCD, 300 × 400 resolution, features reflective imaging and no backlight required

• Equipped with a dual-microphone array, enabling audio algorithms such as noise reduction and echo cancellation, suitable for accurate voice recognition and near-field / far-field voice wake-up applications

• Onboard PCF85063 RTC chip and SHTC3 temperature & humidity sensor for accurate RTC management and environmental monitoring

• Onboard 18650 Lithium Batt holder and RTC backup Batt header. The RTC backup Batt header supports a rechargeable RTC Batt and dual modes of main Batt power supply and RTC independent power supply

• Onboard TF card slot for external storage of images or files

• Onboard programmable KEY and BOOT side buttons for customized function development

• Reserved 2 × 8PIN 2.54mm pitch female header for convenient external expansion