{"product_id":"esp32-s3-4-2inch-rlcd-development-board-300-400-resolution-supports-wi-fi-ble-dual-mode-communication-and-ai-voice-interaction-1","title":"ESP32-S3 4.2inch RLCD Development Board, 300 × 400 Resolution, Supports Wi-Fi \u0026 BLE Dual-mode Communication And AI Voice Interaction","description":"\u003cdiv class=\"overviewSec\"\u003eESP32-S3 4.2inch RLCD Development Board, 300 × 400 Resolution, Supports Wi-Fi \u0026amp; BLE Dual-mode Communication And AI Voice Interaction\u003c\/div\u003e\u003cdiv class=\"richWrap\"\u003e\n\u003cdiv class=\"pdT\" style=\"background-color: #f2f2f2;\"\u003e\n\u003cdiv class=\"richTitle\"\u003eESP32-S3\u003cspan style=\"color: #bf735b;\"\u003e4.2inch\u003c\/span\u003e RLCD development board\u003c\/div\u003e\n\u003cp class=\"hilitBlock2 round1234\" style=\"background: #000000; color: #FFFFFF;\"\u003eE-paper-like Reading Experience, Faster Refresh Response\u003c\/p\u003e\n\u003cp class=\"richDesc\"\u003eAI Voice Interaction, Temperature \u0026amp; Humidity Monitoring, DIY Learning \u0026amp; Development\u003c\/p\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-1.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, front view\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\" style=\"background-color: #e4f1f9;\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-3.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, features\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003eVersion options\u003c\/div\u003e\n\u003cdiv class=\"richGridWrap richGridWrap-2c richGridWrap-valignTop mgnTB\"\u003e\n\u003cdiv\u003e\n\u003cimg class=\"round1234\" style=\"border:solid 1px #ccc;\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-4-1.jpg\" alt=\"ESP32-S3-RLCD-4.2, with Lithium Batt\"\u003e\u003cp\u003e\u003cstrong\u003eESP32-S3-RLCD-4.2\u003c\/strong\u003eComes with a 18650 Lithium Batt\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cimg class=\"round1234\" style=\"border:solid 1px #ccc;\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-4-2.jpg\" alt=\"ESP32-S3-RLCD-4.2-EN, without Lithium Batt\"\u003e\u003cp\u003e\u003cstrong\u003eESP32-S3-RLCD-4.2-EN\u003c\/strong\u003eWithout 18650 Lithium Batt\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\" style=\"background-color: #eff6fc;\"\u003e\n\u003cdiv class=\"richTitle\"\u003eFeatures\u003c\/div\u003e\n\u003cdiv class=\"alignl pdTRBL2\"\u003e\n\u003cp\u003e\u003cspan\u003eThe\u003cstrong\u003eESP32-S3-RLCD-4.2\u003c\/strong\u003e\u003c\/span\u003e 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.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAdopts high-performance Xtensa 32-bit LX7 dual-core processor, up to 240MHz main frequency\u003c\/li\u003e\n\u003cli\u003eSupports 2.4GHz Wi-Fi and Bluetooth 5 (LE), with onboard antenna\u003c\/li\u003e\n\u003cli\u003eBuilt-in 512KB Static RAM, 384KB ROM, with integrated 16MB Flash and 8MB PSRAM\u003c\/li\u003e\n\u003cli\u003eOnboard 4.2inch RLCD, 300 × 400 resolution, features reflective imaging and no backlight required\u003c\/li\u003e\n\u003cli\u003eEquipped 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\u003c\/li\u003e\n\u003cli\u003eOnboard PCF85063 RTC chip and SHTC3 temperature \u0026amp; humidity sensor for accurate RTC management and environmental monitoring\u003c\/li\u003e\n\u003cli\u003eOnboard 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\u003c\/li\u003e\n\u003cli\u003eOnboard TF card slot for external storage of images or files\u003c\/li\u003e\n\u003cli\u003eOnboard programmable KEY and BOOT side buttons for customized function development\u003c\/li\u003e\n\u003cli\u003eReserved 2 × 8PIN 2.54mm pitch female header for convenient external expansion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003eSpecifications\u003c\/div\u003e\n\u003ctable class=\"tabSty-2 mgnTB alignc pdTRBL2\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"width: 25%;\"\u003edisplay panel\u003c\/th\u003e\n\u003ctd width=\"25%\"\u003eRLCD\u003c\/td\u003e\n\u003cth style=\"width: 25%;\"\u003eDisplay size\u003c\/th\u003e\n\u003ctd width=\"25%\"\u003e4.2inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eresolution\u003c\/th\u003e\n\u003ctd\u003e300 × 400\u003c\/td\u003e\n\u003cth\u003egrey scale\u003c\/th\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003einterface\u003c\/th\u003e\n\u003ctd\u003eSPI\u003c\/td\u003e\n\u003cth\u003eDisplay Mode\u003c\/th\u003e\n\u003ctd\u003ereflective\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDriver IC\u003c\/th\u003e\n\u003ctd\u003eST7305\u003c\/td\u003e\n\u003cth\u003edisplay color\u003c\/th\u003e\n\u003ctd\u003eblack, white\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\" style=\"background-color: #e5e4df; \"\u003e\n\u003cdiv class=\"richTitle\"\u003eOnboard audio codec chip\u003c\/div\u003e\n\u003cp class=\"richDesc\" style=\"padding: 0 2em;\"\u003eSupports high-quality audio processing, providing clear and high-quality audio input and output\u003c\/p\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-5.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, onboard audio codec chip\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\" style=\"background-color: #e9ecf1; \"\u003e\n\u003cdiv class=\"richTitle\"\u003eSupports AI Voice Interaction\u003c\/div\u003e\n\u003cp class=\"richDesc\"\u003eAllows access to online large model platforms such as DeepSeek, Doubao, etc\u003c\/p\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-7.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, explains the process of AI Voice Interaction\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003eReflective Liquid Crystal Display\u003c\/div\u003e\n\u003cp class=\"alignl\" style=\"padding: 0 1.5em;\"\u003eThe\u003cstrong\u003eReflective Liquid Crystal Display (RLCD)\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003cvideo autoplay=\"autoplay\" loop=\"loop\" muted=\"muted\" playsinline=\"false\" src=\"\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-13.mp4\" class=\"set-fillet round1234\" style=\"object-fit: none;\"\u003e\u003c\/video\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003eApplication Scenarios\u003c\/div\u003e\n\u003cp class=\"richDesc\"\u003eIdeal for DIY desktop smart ornaments, electronic calendars, AI smart devices,  outdoor displays and more\u003c\/p\u003e\n\u003cdiv class=\"richGridWrap richGridWrap-2c richGridWrap-valignTop mgnTB alignc\"\u003e\n\u003cdiv\u003e\u003cimg class=\"round1234\" style=\"border: 1px solid #ccc;\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-8-1.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, Electronic calendar\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cimg class=\"round1234\" style=\"border: 1px solid #ccc;\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-8-2.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, AI agent\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003eSupports ESP-IDF, Arduino IDE\u003c\/div\u003e\n\u003cp class=\"richDesc\"\u003eComprehensive SDK, dev resources, and tutorials to help you easily get started\u003c\/p\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/dev_platforms\/ESP-IDF.jpg\" alt=\"ESP32-S3-RLCD-4.2, Supports ESP-IDF\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/dev_platforms\/Arduino-IDE.jpg\" alt=\"ESP32-S3-RLCD-4.2, Supports Arduino\"\u003e\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"richTitle\"\u003eWhat's On Board\u003c\/div\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-intro.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, detailed introduction\"\u003e\u003cdiv class=\"richGridWrap richGridWrap-valignTop richGridWrap-2c alignl subBlock bgGrey\"\u003e\n\u003cdiv\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eESP32-S3-WROOM-1-N16R8\u003c\/strong\u003eThe SoC with Wi-Fi and Bluetooth, 240MHz main frequency, integrated with 16MB Flash and 8MB PSRAM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eES7210\u003c\/strong\u003eADC chip for echo cancellation circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eES8311\u003c\/strong\u003elow-power audio codec chip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBOOT button\u003c\/strong\u003ePress it when powering on to enter download mode\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePWR button\u003c\/strong\u003elong press to power off, short press to power on\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKEY button\u003c\/strong\u003ecustomizable for other functions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSHTC3 temperature and humidity sensor\u003c\/strong\u003eprovides ambient temperature and humidity measurement, enabling environmental monitoring function\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePCF85063\u003c\/strong\u003eRTC chip with timekeeping function\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003col start=\"9\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMX1.25 2PIN speaker header\u003c\/strong\u003eaudio output signal, for connecting external speaker\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRTC independent power supply header\u003c\/strong\u003esupports PH1.0 rechargeable  \u003ca href=\"https:\/\/www.waveshare.com\/rtc-battery.htm?sku=26357\" target=\"_blank\" style=\"text-decoration: underline;\"\u003eRTC Batt\u003c\/a\u003eonly\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2 × 8PIN 2.54mm pitch female header\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e18650 Lithium Batt holder\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-microphone array design\u003c\/strong\u003edual-microphone array, paired with ES7210 to achieve echo cancellation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCHG charging indicator\u003c\/strong\u003eoff when fully charged\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWRN warning indicator\u003c\/strong\u003estays on when Batt is reverse-connected\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType-C port\u003c\/strong\u003efor program burning and log printing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTF card slot\u003c\/strong\u003esupports FAT32 TF card for data expansion\u003c\/li\u003e\n\u003c\/ol\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003ePin Definition\u003c\/div\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-details-10.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, Pin Definition\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pdT\"\u003e\n\u003cdiv class=\"richTitle\"\u003eOutline Dimensions\u003c\/div\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-size.jpg\" alt=\"ESP32-S3 4.2inch RLCD Development Board, outline dimensions\"\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"richTitle\"\u003eResources \u0026amp; Services\u003c\/div\u003e\n\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/common\/res_banner.png\"\u003e\u003cdiv class=\"bgGrey\"\u003e\n\u003cstrong\u003eWiki:\u003c\/strong\u003e\u003ca class=\"wikilink\" href=\"http:\/\/docs.waveshare.com\/ESP32-S3-RLCD-4.2\" target=\"_blank\"\u003edocs.waveshare.com\/ESP32-S3-RLCD-4.2\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003ch2\u003eLieferumfang\u003c\/h2\u003e\u003cdiv class=\"msg msg_warning\"\u003e* the 18650 Lithium Batt is optional.\u003c\/div\u003e\u003col\u003e\n\u003cli\u003eESP32-S3-RLCD-4.2 host x1\u003c\/li\u003e\n\u003cli\u003eAcrylic stand (2PCS) x1\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"noteBg\"\u003eOPTIONAL\u003c\/span\u003e 18650 rechargeable Lithium Batt x1\u003c\/li\u003e\n\u003cli\u003e8Ω 2W MX1.25 2PIN speaker x1\u003c\/li\u003e\n\u003cli\u003eScrewdriver x1\u003c\/li\u003e\n\u003c\/ol\u003e\u003cdiv class=\"imgTextWrap\"\u003e\n\u003cdiv\u003e1\u003ca href=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-2.jpg\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-2_220.jpg\" alt=\"ESP32-S3-RLCD-4.2\"\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e2\u003ca href=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-10.jpg\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/ESP32-S3-RLCD-4.2\/ESP32-S3-RLCD-4.2-10_93.jpg\" alt=\"ESP32-S3-RLCD-4.2\"\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e3\u003ca href=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/21700-5000mAh-new.jpg\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/21700-5000mAh-new_93.jpg\" alt=\"Lithium Batt\"\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e4\u003ca href=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/4021-8%CE%A92W-2pin-80mm.jpg\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/4021-8%CE%A92W-2pin-80mm_93.jpg\" alt=\"Lithium Batt\"\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e5\u003ca href=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/screwdriver.jpg\"\u003e\u003cimg src=\"https:\/\/www.waveshare.com\/img\/devkit\/general\/screwdriver_93.jpg\" alt=\"Lithium Batt\"\u003e\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"WaveShare","offers":[{"title":"Default Title","offer_id":53568548176209,"sku":"WSAL33507","price":11283.46,"currency_code":"HUF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0983\/3798\/0753\/files\/wsal332981-485433.jpg?v=1776698819","url":"https:\/\/albistech.eu\/products\/esp32-s3-4-2inch-rlcd-development-board-300-400-resolution-supports-wi-fi-ble-dual-mode-communication-and-ai-voice-interaction-1","provider":"Albistech","version":"1.0","type":"link"}