The Arduino UNO R4 WiFi (ABX00087) can serve as a robot’s main controller: its 5 V UNO-compatible I/O supports sensors and control signals, while PWM, I2C, SPI, UART and CAN provide ways to connect peripherals. Its ESP32-S3 module adds Wi-Fi and Bluetooth. It is not a motor power supply, however; Arduino explicitly warns against powering high-current devices such as servos from the board’s 5 V pin. “Mk36” is not defined in Arduino’s board documentation, so it should be treated as this project’s revision label, not as a documented Arduino model or feature.
What the UNO R4 WiFi brings to a robot
The board combines two chips with distinct roles. The Renesas RA4M1 is the main 48 MHz Arm Cortex-M4 microcontroller that runs the robot’s sketch. An ESP32-S3 module supplies wireless connectivity and normally acts as a serial bridge between the computer and the RA4M1, including handling the main MCU’s reboot during sketch upload.
| Specification | UNO R4 WiFi | Robotics relevance |
|---|---|---|
| Main microcontroller | Renesas RA4M1, 48 MHz Arm Cortex-M4 | Runs control logic and reads connected peripherals. |
| RA4M1 memory | 256 kB flash, 32 kB SRAM, 8 kB EEPROM | Flash stores the program; SRAM is working memory; EEPROM provides non-volatile storage. |
| Digital and analog I/O | 14 digital I/O, 6 analog inputs | Connect compatible digital peripherals and analog-output sensors. |
| PWM | 6 PWM pins | Can provide control signals to suitable drivers or other compatible electronics. |
| Interfaces | UART, I2C, SPI and CAN | Connect sensors, motor controllers and distributed subsystems that use these buses. |
| Operating voltage | 5 V circuitry and GPIO | Maintains compatibility with the UNO’s 5 V ecosystem; connected devices must still be electrically compatible. |
| Power input | VIN/barrel input: 6–24 V | This input range is not a recommendation to power motors from the board’s 5 V pin. |
| On-board features | 12 × 8 LED matrix and Qwiic connector | The matrix can show compact status or fault information; Qwiic supports compatible I2C-style expansion. |
| Form factor | 68.85 × 53.34 mm | Retains the UNO form factor and pinout used by many shields. |
The pin counts, dimensions and power figures above are Arduino’s published board specifications and documentation. The interfaces make the UNO R4 WiFi a flexible controller, but they do not establish that a particular chassis, motor, servo or shield has been tested with a project called Mk36.
Can it run servos and motors?
It can provide control signals to compatible motor drivers and servo electronics, but that is different from supplying actuator power. Arduino’s UNO R4 WiFi User Manual, revised 2026-09-22, warns: “External devices with a high current draw (e.g. servo motors) should never be powered via the 5 V pin.” The manual describes the board’s 5 V pin as mainly intended for lower-current devices such as sensor modules.
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![Arduino UNO R4 WiFi [ABX00087] - Renesas RA4M1 + ESP32-S3, Wi-Fi, Bluetooth, USB-C, CAN, 12-bit DAC, OP AMP, Qwiic Connector, 12x8 LED Matrix for Advanced IoT & Embedded Projects](https://m.media-amazon.com/images/I/416S910MpBL._SL160_.jpg)
- Dual-Core Processing with Renesas RA4M1 and ESP32-S3: The Arduino UNO R4 WiFi combines the Renesas RA4M1 microcontroller (ARM Cortex-M4) and the ESP32-S3 Wi-Fi/Bluetooth chip, delivering powerful dual-core processing capabilities. This combination offers flexibility for a wide range of projects, from high-speed communications and wireless control to real-time data processing and edge AI applications.
- Comprehensive Wireless Connectivity: Equipped with Wi-Fi and Bluetooth 5.0, the UNO R4 WiFi ensures robust wireless communication for IoT projects, remote sensors, smart devices, and wireless control applications. Whether connecting to the cloud, other devices, or local networks, the board offers stable and high-speed wireless connectivity for seamless operation.
- Modern USB-C, CAN, & Qwiic Connector: The USB-C port enables efficient power delivery and fast programming, improving ease of use compared to traditional USB connections. The Controller Area Network (CAN) support allows for reliable, real-time communication in industrial, automotive, or robotic systems. Additionally, the Qwiic Connector makes it easy to add I2C sensors and peripherals, simplifying the connection process and reducing the need for complex wiring.
- High-Precision 12-bit DAC & OP-AMP: For projects that require high-quality analog output, the 12-bit DAC (Digital-to-Analog Converter) and integrated operational amplifier (OP-AMP) provide precise analog signal generation and amplification. This feature is ideal for audio projects, sensor interfacing, or applications where analog signal control and processing are necessary.
- Integrated 12x8 LED Matrix: The UNO R4 WiFi includes a built-in 12x8 LED Matrix, enabling users to display dynamic visuals, messages, or real-time data on the board itself. This makes it perfect for projects that require immediate visual feedback, such as status indicators, event displays, or interactive user interfaces.
Plan the robot’s power path around the load: use an appropriately rated, separate supply for motors or servos, and connect grounds as required by the driver and device instructions so their control signals have a shared reference where needed. Check the driver’s voltage and current requirements, the actuator’s requirements, and the signal-level compatibility before connecting anything. A 6–24 V VIN rating describes the board’s input range; it does not mean that this voltage should be applied to a 5 V peripheral or to a motor driver without checking its specifications.
How to plan the robot’s connections
- Choose the actuator driver first. Select a motor controller or servo interface appropriate for the actuators, then verify its supply, current capacity, control interface and logic-level requirements. The UNO’s PWM pins are signal outputs, not a substitute for a power stage.
- Match each sensor or subsystem to an interface. Use analog inputs for compatible analog-output sensors; digital I/O for compatible digital signals; and I2C, SPI, UART or CAN when the peripheral supports that bus. Confirm pin assignments and electrical requirements in the device documentation.
- Keep actuator power separate from the board’s 5 V pin. Size the external motor or servo supply for the connected loads, and follow the driver’s grounding and wiring guidance. Do not infer power capacity from the board’s I/O count.
- Use the board’s built-in display for simple feedback. The 12 × 8 LED matrix can display compact states such as a mode or fault indication; it is not a substitute for a larger interface if the robot needs detailed output.
- Check shield and accessory fit before purchase. The board keeps the UNO form factor, pinout and 5 V operating voltage, which supports an existing shield ecosystem. Still confirm a shield’s voltage, connectors, pin usage and mechanical fit for the exact board and robot.
How Wi-Fi and Bluetooth work on the board
The ESP32-S3 module handles wireless functions while the RA4M1 remains the main sketch-running MCU. For Wi-Fi features in an Arduino sketch, use Arduino’s built-in WiFiS3 library. The module normally retains its connectivity firmware and its serial-bridge role; it is not simply a second general-purpose processor that must be programmed for ordinary Wi-Fi use.
Rank #2
- All-in-One Starter Kit for Beginners: Part of the Powered by Arduino program, this kit includes an original Arduino UNO R4 WiFi, 300+ high-quality components, 50+ hands-on projects (30 basic, 13 fun, and 8 IoT), and 100+ free video lessons co-created with renowned educator Paul McWhorter. Designed for beginners ages 8+, it provides a complete, step-by-step path to learn Arduino, electronics, coding, and IoT. RoHS compliant for added safety and quality, it also makes a thoughtful gift for tech enthusiasts, students, and aspiring makers for birthdays, holidays, and special occasions
- Powerful Arduino Uno R4 WiFi Board: Upgraded from the Arduino Uno R3, the Arduino Uno R4 WiFi features a 32-bit processor, more memory, and built-in WiFi and Bluetooth, enabling connection to third-party apps for more interactive and practical projects.
- 300+ Components for Endless Possibilities: With 300+ components and sensors, this kit is perfect for portable projects. It features step-by-step tutorials, open-source code, and compatibility with other Arduino boards like Uno R3 and Nano, offering endless customization and learning opportunities.
- Engaging Projects for Every Skill Level: Featuring 50 projects (30 basic, 13 fun, 8 IoT) with IoT app integration like Arduino IoT Cloud , this kit supports Arduino C++ programming, making it perfect for students, teachers, and engineers to learn, code, and create at any skill level.
- Dedicated Support for Beginners: Alongside online resources and video tutorials, SunFounder provides technical support and troubleshooting forums to help beginners solve programming challenges with ease.
Wi-Fi and Bluetooth share the module’s trace antenna, so the UNO R4 WiFi User Manual says they cannot be used simultaneously. The ESP32-S3 can be programmed separately through its exposed header, but doing so replaces the default connectivity firmware until that firmware is restored. Unless custom ESP32-S3 firmware is a deliberate requirement, leave the module’s connectivity firmware in place and use the board’s documented Wi-Fi workflow.
Arduino’s Help Center says the connectivity-module firmware is automatically updated when a new device is added to Arduino Cloud. For other maintenance or setup situations, consult Arduino’s current connectivity-module firmware procedure and board-package version: these details may change over time.
Rank #3
- ELEGOO UNO R4 WiFi Control Board: Fully compatible with Arduino IDE and original Arduino shields. Features a 32-bit 48 MHz Renesas RA4M1 processor, USB-C, a 12 × 8 LED matrix, a Qwiic connector, built-in Wi-Fi and Bluetooth connectivity. Suitable for interactive STEM projects, it gives learners more room to progress from basic circuits to connected IoT projects
- Step-by-Step Tutorials for Beginners: Start with clear wiring diagrams and ready-to-run sample code, then advance through sensors, displays, motors, RFID, and wireless projects. Structured lessons reduce setup confusion and help beginners understand both how each circuit works and how to modify it
- 200+ Components with Practical Modules: Ultrasonic sensor, PIR motion sensor, RFID module, OLED display, keypad, joystick, relay, servo, stepper motor, DC motor and fan blade, temperature and humidity sensor, breadboard, jumper wires, LEDs, resistors, and more. Also compatible with your existing UNO R3 shields and projects
- Build Projects You Can Recognize: Equipped with professional online tutorials and step-by-step graphical manuals. Suitable for teens, beginners, hobbyists, educators, engineering students and electronics enthusiasts. The included parts support a progressive path from first coding exercises to maker prototypes without purchasing every module separately
- Organized Parts and Reliable Support: Each kit includes clearly listed components and beginner-friendly project resources to help users identify parts and start faster. ELEGOO provides responsive technical support for setup, programming, wiring and troubleshooting, ensuring you have a smooth learning experience
Which UNO R4 WiFi board or accessories should you buy?
For this controller, the exact product name is Arduino UNO R4 WiFi board, SKU ABX00087. Accessory categories that may suit a build include UNO-compatible robotics shields, motor drivers, Qwiic cables and sensors. No specific accessory is established here as verified for Mk36, so check voltage, connector, pin and physical compatibility against the board and the rest of the robot before ordering.
The UNO R4 WiFi is a sensible fit when the design benefits from 5 V UNO-style connections, built-in Wi-Fi/Bluetooth and the listed peripheral interfaces. Whether it is the right controller for a particular robot also depends on that robot’s actuator power design, peripherals, physical layout and software needs; the board specifications alone cannot answer those project-specific questions.
Rank #4
![UNO R4 WiFi Board [ABX00087] – Dual-Core Microcontroller, Wi-Fi & Bluetooth, USB-C, CAN, 12-bit DAC, OP-AMP, Qwiic Connector, LED Matrix for IoT & Embedded Projects, Compatible with Arduino IDE](https://m.media-amazon.com/images/I/51ZSNygIuGL._SL160_.jpg)
- ⚡Dual-Core Power for Advanced Projects: The UNO R4 WiFi Board features the Renesas RA4M1 microcontroller combined with ESP32-S3, providing dual-core performance for real-time processing, wireless control, IoT applications, and edge AI projects.
- 📶 Seamless Wireless Connectivity: Integrated Wi-Fi and Bluetooth 5.0 enable reliable wireless communication for IoT devices, remote sensors, smart home automation, and industrial projects, ensuring stable connections to the cloud, networks, and other devices.
- 🔌 Modern Interfaces and Expandability: USB-C port allows fast programming and efficient power delivery. The CAN interface supports real-time communication in robotics, automotive, and industrial systems, while the Qwiic connector simplifies integration of I2C sensors and peripherals.
- 🛠️ High-Precision Analog Control: Equipped with a 12-bit DAC and built-in operational amplifier (OP-AMP), the UNO R4 WiFi Board delivers accurate analog signal generation and amplification, perfect for audio projects, sensor interfacing, and analog signal processing.
- ⏱️ Built-in 12x8 LED Matrix for Visualization: The onboard 12x8 LED matrix enables immediate visual feedback, making it ideal for displaying dynamic data, messages, interactive user interfaces, status indicators, or real-time project monitoring.
What “Mk36” means
Arduino’s official board material identifies the product as the UNO R4 WiFi, not “Mk36.” No authoritative definition of that suffix or project-specific Mk36 build details are established here. Treat Mk36 as the project’s own revision identifier unless its owner provides a build log, repository or schematic. There are no published project-specific test results establishing runtime, payload, wireless range, motor compatibility or reliability.
Quick Recap
Best Value
- [DUAL-CORE ARCHITECTURE FOR ADVANCED IOT] Built with a 32-bit Renesas RA4M1 and an ESP32-S3 coprocessor, this board handles heavy data processing and edge AI tasks effortlessly. It solves the computing bottlenecks of 8-bit boards, providing makers and developers with unprecedented power for complex smart home projects.
- [SEAMLESS WI-FI & BLUETOOTH 5.0 INTEGRATION] Equipped with native Wi-Fi and Bluetooth connectivity, eliminating the need for bulky external wireless shields. Ideal for remote sensor monitoring or cloud-based IoT networks, it offers stable, high-speed data transmission to keep your smart devices constantly connected.
- [BUILT-IN 12x8 LED MATRIX FOR INSTANT VISUALS] Features an integrated 12x8 red LED matrix directly on the board to display animations, scrolling text, or real-time sensor data. This provides engineers with immediate visual feedback and debugging capabilities without requiring any complicated external wiring.
- [MODERN INTERFACES: USB-C, QWIIC & CAN BUS] Upgraded with a robust USB-C port for fast programming, a Qwiic I2C connector for plug-and-play sensor addition, and built-in CAN bus support. These industrial-grade connections empower you to build automotive robotics or scalable systems safely and easily.
- [12-BIT DAC & ULTIMATE SHIELD COMPATIBILITY] Offers a high-precision 12-bit DAC and operational amplifier for premium analog audio projects. While significantly upgraded, it maintains the classic 5V operating voltage and form factor, ensuring your existing shields and modules remain fully compatible and useful.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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