Current Purchase Guide: UNO R4 WiFi Kit Who it is for: makers, students, educators and embedded developers who want an UNO-format board for connected electronics projects without assembling a WiFi, Bluetooth and sensor-expansion platform from separate modules. What This Kit Is This OpenELAB kit follows the UNO R4 WiFi hardware architecture: a 5V UNO-style development board with a Renesas RA4M1 as the primary MCU and an ESP32-S3-MINI for wireless connectivity. It combines familiar Arduino project workflows with Qwiic I2C expansion, a programmable 12 x 8 LED matrix, CAN, DAC and operational-amplifier capabilities. What You Can Build WiFi and Bluetooth Low Energy connected sensors, controls and IoT prototypes Qwiic-based I2C projects with compatible sensors and displays Small visual interfaces, indicators and data displays with the integrated LED matrix CAN bus experiments, analog-output projects and USB HID interfaces Arduino programming, electronics education and rapid proof-of-concept builds Why Choose This Platform UNO layout to project faster: the familiar header arrangement helps makers move from basic circuits to more capable connected projects. RA4M1 plus ESP32-S3: the main MCU handles application logic while the ESP32-S3 adds WiFi and Bluetooth Low Energy connectivity. Qwiic connector: compatible I2C modules can be connected with Qwiic cables, reducing the wiring work needed for early prototypes. Built-in 12 x 8 LED matrix: show status, compact sensor values, icons or animations without adding a separate display. More than basic GPIO: CAN, DAC, RTC and an operational amplifier support projects that need additional interfaces or analog functions. Applications Connected classroom and maker projects Home monitoring and simple IoT prototypes Sensor data logging and visual status indicators Interactive controls, USB HID projects and small user interfaces CAN bus learning and embedded-interface experiments Compatibility and Packing Record Software: use the Arduino IDE with the board package and libraries compatible with the UNO R4 WiFi architecture. Qwiic: the Qwiic I2C connector is 3.3V. Do not connect a higher-voltage device to this connector. CAN: CAN bus use requires an appropriate external CAN transceiver; the board alone is not a complete CAN physical-layer interface. Motor and high-current loads: use a suitable external driver and power supply. Do not power motors or other high-current loads directly from the board. Current page packing record: 1 x OpenELAB UNO R4 Kit, 1 x USB-C cable, 1 x prototyping board, jumper wires and documentation. Confirm the packing record before purchase when a particular accessory is essential to your project. Important Purchase Notes This is not a standalone ESP32-S3 development board. The RA4M1 is the primary MCU; the ESP32-S3-MINI supports wireless connectivity. USB-C is used for power, programming and serial communication. Do not apply more than 5V through the USB-C port. WiFi and Bluetooth projects require software configuration and compatible libraries; they are not preconfigured end-user appliances. External modules must be checked for voltage, logic level, current draw and library compatibility before connection. Specifications Primary MCU Renesas RA4M1, 32-bit Arm Cortex-M4, 48 MHz Primary MCU memory 256 kB Flash, 32 kB SRAM, 8 kB EEPROM Wireless coprocessor ESP32-S3-MINI for WiFi and Bluetooth connectivity Operating voltage 5V for the RA4M1 and board GPIO Wireless WiFi 802.11 b/g/n and Bluetooth 5 Display Programmable 12 x 8 red LED matrix Interfaces Qwiic I2C, UART, SPI, I2C and CAN support Additional peripherals RTC, up to 12-bit DAC and operational amplifier Power input 5V via USB-C; 6-24V via VIN or DC barrel jack FAQ Is this an ESP32-S3 board? No. The RA4M1 is the primary microcontroller. The ESP32-S3-MINI supports WiFi and Bluetooth connectivity and can be separately programmed through its dedicated header when a project requires it. Can I connect Qwiic sensors directly? Yes, with compatible Qwiic I2C modules and cables. The Qwiic connector is 3.3V, so verify the voltage and software requirements of each module first. Can I use the CAN feature immediately? You need a suitable external CAN transceiver and the correct wiring before connecting to a CAN network. Is it suitable for beginners? It is a good fit for learners who are ready to work with the Arduino IDE, basic wiring and libraries. Projects involving wireless setup, CAN or external power require additional technical knowledge. Does it include a motor driver or a power supply for motors? No motor driver or high-current motor power system is identified in the current packing record. Choose an external driver and power supply matched to the motor and project requirements.
