ESP32-S3 4.2inch RLCD Development Board

Overview ESP32-S3 4.2inch RLCD development board. E-paper-like Reading Experience, Faster Refresh Response. AI Voice Interaction, Temperature & Humidity Monitoring, DIY Learning & Development Features 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 Specifications Display panel RLCD Display size 4.2inch Resolution 300 × 400 Grey scale 2 Interface SPI Display Mode reflective Driver IC ST7305 Display color black, white Onboard audio codec chip Supports high-quality audio processing, providing clear and high-quality audio input and output Supports AI Voice Interaction Allows access to online large model platforms such as DeepSeek, Doubao, etc Reflective Liquid Crystal Display The Reflective Liquid Crystal Display (RLCD) is a specialized type of LCD that efficiently utilizes ambient light (such as natural sunlight or indoor illumination) instead of a backlight, achieving both energy efficiency and environmental friendliness. Thanks to its reflective design, RLCDs perform exceptionally well in bright environments, where conventional LCDs may suffer from glare and reduced visibility. By effectively reflecting external light, the RLCD can provide a clear, high-quality visual experience. Application Scenarios Ideal for DIY desktop smart ornaments, electronic calendars, AI smart devices, outdoor displays and more Supports ESP-IDF, Arduino IDE Comprehensive SDK, dev resources, and tutorials to help you easily get started What's On Board ESP32-S3-WROOM-1-N16R8 The SoC with Wi-Fi and Bluetooth, 240MHz main frequency, integrated with 16MB Flash and 8MB PSRAM ES7210 ADC chip for echo cancellation circuit ES8311 Low-power audio codec chip BOOT button Press it when powering on to enter download mode PWR button Long press to power off, short press to power on KEY button Customizable for other functions SHTC3 temperature and humidity sensor Provides ambient temperature and humidity measurement, enabling environmental monitoring function PCF85063 RTC chip with timekeeping function MX1.25 2PIN speaker header Audio output signal, for connecting external speaker RTC independent power supply header Supports PH1.0 rechargeable RTC Batt only 2 × 8PIN 2.54mm pitch female header 18650 Lithium Batt holder Dual-microphone array design Dual-microphone array, paired with ES7210 to achieve echo cancellation CHG charging indicator Off when fully charged WRN warning indicator Stays on when Batt is reverse-connected Type-C port For program burning and log printing TF card slot Supports FAT32 TF card for data expansion Pin Definition Outline Dimensions Package Contents ESP32-S3-RLCD-4.2 host x1 Acrylic stand (2PCS) x1 8Ω 2W MX1.25 2PIN speaker x1 Screwdriver x1 Note: Does not include the LiPo battery required. Documentation: http://docs.waveshare.com/ESP32-S3-RLCD-4.2