ESP32-S3 AI RLCD Total Reflection Screen 4.2 inch Development Board Deepseek

ESP32-S3 AI RLCD Total Reflection Screen 4.2 inch Development Board Deepseek

$25.9

Brand：SpotPear

SKU：020811100000

Date：2026-04-09 14:20

Part Number：

ESP32-S3-RLCD-4.2-EN

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ESP32-S3 4.2inch RLCD Development Board, 300 × 400 Resolution, Supports Wi-Fi & BLE Dual-mode Communication And AI Voice Interaction

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【Products】

ESP32-S3 4.2inch
RLCD Development Board

E-paper-like Reading Experience, Faster Refresh Response

AI Voice Interaction, Temperature & Humidity Monitoring, DIY Learning & Development

Version Options

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

[] ESP32-S3-RLCD-4.2-EN

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