{"product_id":"uno-r4-compatible-wifi-board-ra4m1-esp32","title":"UNO R4-Compatible WiFi Board — RA4M1 \u0026 ESP32-S3, Wi-Fi, Bluetooth, USB-C, CAN Bus, 12-Bit DAC, LED Matrix","description":"\u003ch2\u003e📋 Overview\u003c\/h2\u003e\n\u003cp\u003eThe UNO R4-Compatible WiFi Board is a UNO-format development board built around the same core chipset found in certain officially branded UNO R4 WiFi boards: a 32-bit Renesas RA4M1 microcontroller paired with an ESP32-S3 module for Wi-Fi and Bluetooth. This is a compatible board, not a genuine Arduino-branded product — but because it uses the identical RA4M1 and ESP32-S3 chipset, it runs the same sketches, libraries, and board packages used across the maker community.\u003c\/p\u003e\n\u003cp\u003eUnder the hood, this board uses a dual-MCU design: the RA4M1 runs your sketch and controls all onboard peripherals, while a separate dual-core ESP32-S3 coprocessor handles Wi-Fi and Bluetooth 5 wireless connectivity. On top of that, you get a built-in 12x8 LED matrix, a 12-bit DAC, an onboard op-amp, USB-C, a Qwiic I2C connector, and CAN bus support — all while keeping the classic 5V UNO operating voltage and pin layout for shield compatibility.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e⭐ Key Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRenesas RA4M1 Microcontroller\u003c\/strong\u003e — 32-bit Arm Cortex-M4 at 48 MHz with FPU, 256 kB flash, 32 kB SRAM, 8 kB EEPROM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eESP32-S3 Wi-Fi \u0026amp; Bluetooth Coprocessor\u003c\/strong\u003e — Dual-core module with Wi-Fi 4 (802.11 b\/g\/n, 2.4 GHz) and Bluetooth 5 LE built in, no shield required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-In 12x8 LED Matrix\u003c\/strong\u003e — 96 programmable red LEDs for animations, scrolling text, and live sensor readouts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e12-Bit DAC \u0026amp; Onboard Op-Amp\u003c\/strong\u003e — Generate analog waveforms and buffer or amplify analog signals directly on the board\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB-C, Qwiic I2C \u0026amp; CAN Bus\u003c\/strong\u003e — Modern USB-C programming port, plug-and-play Qwiic connector, and a CAN controller for automotive and industrial projects (external transceiver required)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull UNO Shield Compatibility\u003c\/strong\u003e — Same 5V operating voltage and pin layout as classic UNO boards, so most existing shields and accessories still work\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📌 Module Pinout\u003c\/h2\u003e\n\u003cp\u003eLooking at the board from the top, with the USB-C port and DC jack at the top-left and the digital header along the top edge:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003ePin\u003c\/th\u003e\n\u003cth\u003eLabel\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eD0 \/ D1\u003c\/td\u003e\n\u003ctd\u003eRX \/ TX\u003c\/td\u003e\n\u003ctd\u003eUART Serial Receive \/ Transmit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD2, D3\u003c\/td\u003e\n\u003ctd\u003eDigital \/ Interrupt\u003c\/td\u003e\n\u003ctd\u003eGPIO with external interrupt support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD3, D5, D6, D9\u003c\/td\u003e\n\u003ctd\u003ePWM (~)\u003c\/td\u003e\n\u003ctd\u003ePWM-capable digital pins\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD4\u003c\/td\u003e\n\u003ctd\u003eDigital\u003c\/td\u003e\n\u003ctd\u003eGeneral purpose GPIO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD10\u003c\/td\u003e\n\u003ctd\u003eCANTX0\u003c\/td\u003e\n\u003ctd\u003eCAN Bus Transmit (requires external transceiver)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD11–D13\u003c\/td\u003e\n\u003ctd\u003eSPI \/ SCK\u003c\/td\u003e\n\u003ctd\u003eSPI Controller Out\/In, Clock (D13 doubles as CANRX0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD13\u003c\/td\u003e\n\u003ctd\u003eCANRX0\u003c\/td\u003e\n\u003ctd\u003eCAN Bus Receive (requires external transceiver)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSDA \/ SCL\u003c\/td\u003e\n\u003ctd\u003eDigital header I2C\u003c\/td\u003e\n\u003ctd\u003eStandard I2C bus (also on A4\/A5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA0\u003c\/td\u003e\n\u003ctd\u003eAnalog In \/ DAC\u003c\/td\u003e\n\u003ctd\u003eAnalog input 0 or 12-bit DAC output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA1 \/ A2 \/ A3\u003c\/td\u003e\n\u003ctd\u003eOPAMP+ \/ OPAMP− \/ OPAMP Out\u003c\/td\u003e\n\u003ctd\u003eOnboard operational amplifier connections\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA4 \/ A5\u003c\/td\u003e\n\u003ctd\u003eSDA \/ SCL\u003c\/td\u003e\n\u003ctd\u003eStandard I2C bus (shared with digital header)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQwiic Connector\u003c\/td\u003e\n\u003ctd\u003eSCL \/ SDA \/ 3V3 \/ GND\u003c\/td\u003e\n\u003ctd\u003eSecondary I2C bus, 3.3V only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVIN\u003c\/td\u003e\n\u003ctd\u003ePower In\u003c\/td\u003e\n\u003ctd\u003e6–24V input (barrel jack or header)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSB-C\u003c\/td\u003e\n\u003ctd\u003ePower \/ Data\u003c\/td\u003e\n\u003ctd\u003e5V power, programming, and serial communication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e+5V \/ +3V3\u003c\/td\u003e\n\u003ctd\u003ePower Out\u003c\/td\u003e\n\u003ctd\u003eRegulated power rails for external components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Important:\u003c\/strong\u003e The ESP32-S3 coprocessor, its dedicated header, and the Qwiic connector operate at 3.3V and are not 5V tolerant. Never connect a 5V signal to these — doing so can permanently damage the ESP32-S3 module.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/files\/Arduino-compatible-Uno-R4-wifi-1_b8708e91-759b-4032-89a0-b492659fa0d0_480x480.jpg?v=1787681054\" alt=\"Arduino Uno R4-compatible Wifi Microcontroller Top View\" style=\"margin-bottom: 2px; float: none;\"\u003e\u003c\/div\u003e\n\u003chr\u003e\n\u003ch2\u003e📊 Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMain Microcontroller\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRenesas RA4M1 (R7FA4M1AB3CFM), 48 MHz Arm Cortex-M4 with FPU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWireless Module\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eESP32-S3-MINI-1-N8, dual-core Xtensa LX7, Wi-Fi 4 (2.4 GHz) \u0026amp; Bluetooth 5 LE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlash \/ SRAM \/ EEPROM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e256 kB \/ 32 kB \/ 8 kB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V (RA4M1) \/ 3.3V (ESP32-S3, internal only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage (VIN)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6–24V (barrel jack or header)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUSB Input Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.8–5.5V via USB-C (do not exceed 5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDigital I\/O Pins\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14, each rated up to 8 mA max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAnalog Input Pins\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 (A0–A5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDAC Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 12-bit (on pin A0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLED Matrix\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12x8 (96 LEDs), red, charlieplexed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1x UART, 1x SPI, 2x I2C (incl. Qwiic), 1x CAN (external transceiver required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUSB Connector\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB-C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBoard Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 68.6 × 53.3 × 15 mm (2.70 x 2.10 x 0.59 inches) L × W × H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003e🔌 CAN Bus Wiring\u003c\/h2\u003e\n\u003cp\u003eThe RA4M1's CAN controller is built into the microcontroller but has no onboard transceiver. You'll need an external CAN transceiver module (such as an SN65HVD230) to connect to an actual CAN bus network.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBoard Pin\u003c\/th\u003e\n\u003cth\u003eCAN Transceiver Pin\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eD13 (CANRX0)\u003c\/td\u003e\n\u003ctd\u003eCAN RX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD10 (CANTX0)\u003c\/td\u003e\n\u003ctd\u003eCAN TX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3.3V\u003c\/td\u003e\n\u003ctd\u003eVIN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGND\u003c\/td\u003e\n\u003ctd\u003eGND\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003e📝 Note:\u003c\/strong\u003e A CAN transceiver is required for this board to communicate on a real CAN bus network — the pins alone will not work without one.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr\u003e\n\u003ch2\u003e📦 What's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x UNO R4-Compatible WiFi Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eUSB-C cable, jumper wires, and shields are not included.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e🔌 Compatible With\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eArduino IDE (Desktop) and Arduino Cloud Editor, using an RA4M1-compatible board package\u003c\/li\u003e\n\u003cli\u003eExisting 5V UNO-format shields and accessories\u003c\/li\u003e\n\u003cli\u003eQwiic-standard I2C sensor and actuator modules (3.3V only)\u003c\/li\u003e\n\u003cli\u003eExternal CAN transceiver modules (e.g., SN65HVD230)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e🎯 Typical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIoT and smart home projects using built-in Wi-Fi and Bluetooth\u003c\/li\u003e\n\u003cli\u003eVisual feedback and status displays using the onboard LED matrix\u003c\/li\u003e\n\u003cli\u003eAudio signal generation and simple analog projects using the 12-bit DAC\u003c\/li\u003e\n\u003cli\u003eAutomotive, robotics, or industrial prototyping using CAN bus\u003c\/li\u003e\n\u003cli\u003eSTEM education and general-purpose learning projects\u003c\/li\u003e\n\u003cli\u003eUpgrading existing 8-bit UNO shield-based projects to more memory and speed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e⚠️ Important Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDo not power the board with more than 5V through the USB-C port\u003c\/li\u003e\n\u003cli\u003eNever connect a 5V signal to the ESP32-S3 header or the Qwiic connector — both are 3.3V only and not 5V tolerant\u003c\/li\u003e\n\u003cli\u003eDigital GPIO pins are rated for a maximum of 8 mA — use an external driver or power supply for higher-current loads like motors or servos\u003c\/li\u003e\n\u003cli\u003eA4\/A5 are shared with the main I2C bus — avoid using them as analog inputs while I2C devices are active on that bus\u003c\/li\u003e\n\u003cli\u003eCAN bus functionality requires an external transceiver module; it will not work with the pins alone\u003c\/li\u003e\n\u003cli\u003eOperating temperature range is -40°C to +85°C; USB input should stay within 4.8–5.5V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e📄 Documentation \u0026amp; Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" title=\"UNO R4-Compatible WiFi Board User Guide\" href=\"https:\/\/envistiamall.com\/blogs\/learn\/uno-r4-compatible-wifi-board-user-guide\" target=\"_blank\"\u003eUser Guide — Setup, pinout, CAN bus wiring, specifications \u0026amp; troubleshooting\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/es\/blogs\/learn\/tagged\/microcontrollers-arduino\" target=\"_blank\" title=\"Arduino-Compatible Development Board User Guides\" rel=\"noopener\"\u003eAll Arduino-Compatible Development Board \u0026amp; Microcontroller Guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cem\u003eSold and supported by Envistia Mall. Shipped from the United States. This product is a compatible board using the same RA4M1 and ESP32-S3 chipset as certain officially branded microcontroller boards, but it is not manufactured, endorsed, or affiliated with the original brand owner, and is not sold under that brand's trademark. Please refer to the linked User Guide for full setup instructions, pinout details, and safety information. Envistia Mall is not liable for damage resulting from improper wiring, incorrect voltage, or misuse of this product. Always follow proper electrical safety practices when working with development boards and connected components.\u003c\/em\u003e\u003c\/p\u003e","brand":"Envistia","offers":[{"title":"Default Title","offer_id":48897440973049,"sku":"EM-MICRP-0036","price":16.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1641\/0911\/files\/uno-r4-compatible-wifi-board-ra4m1-esp32-s3-wi-fi-bluetooth-usb-c-can-bus-12-bit-dac-led-matrix-1729129.jpg?v=1787692692","url":"https:\/\/envistiamall.com\/es\/products\/uno-r4-compatible-wifi-board-ra4m1-esp32","provider":"Envistia Mall","version":"1.0","type":"link"}