Arduino UNO EK R4 WiFi
Arduino UNO R4 WiFi EK (एक) — Renesas RA4M1 48 MHz Arm Cortex-M4 — ESP32-S3 Wi-Fi 4 & Bluetooth 5 — 12×8 LED Matrix | Made in India The Official...
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Arduino UNO R4 WiFi EK (एक) — Renesas RA4M1 48 MHz Arm Cortex-M4 — ESP32-S3 Wi-Fi 4 & Bluetooth 5 — 12×8 LED Matrix | Made in India
The Official Arduino UNO R4 WiFi EK (एक) is the Made-in-India evolution of the iconic UNO series — powered by a Renesas RA4M1 32-bit Arm Cortex-M4 running at 48 MHz with a hardware FPU, 256 KB Flash, and seamless wireless connectivity through an onboard ESP32-S3 delivering Wi-Fi 4 (802.11 b/g/n) and Bluetooth 5. It preserves full compatibility with all existing Arduino Uno shields while adding a 12×8 LED matrix, 14-bit ADC, 12-bit DAC, Qwiic connector, CAN bus, and native Arduino IoT Cloud support — certified, fully official, and manufactured in India.
Key Highlights
- Made in India — Fully Certified — Official Arduino UNO R4 WiFi manufactured domestically under Arduino's certification programme, giving Indian makers and educators a locally sourced board with global-standard quality.
- Renesas RA4M1 @ 48 MHz with FPU — A 32-bit Arm Cortex-M4 with hardware floating-point handles complex maths, signal processing, and PID control at roughly 3× the speed of the classic 8-bit UNO R3.
- Wi-Fi 4 + Bluetooth 5 via ESP32-S3 — The onboard ESP32-S3-MINI-1-N8 delivers 802.11 b/g/n at up to 150 Mbps on 2.4 GHz and Bluetooth 5, all without an external antenna or module.
- 12×8 LED Matrix — 96 Individually Addressable Points — A Charlieplexed red LED grid lets you display animations, scrolling text, sensor readings, and game graphics directly from your sketch with no extra hardware.
- 14-bit ADC + 12-bit DAC — Higher-resolution analog I/O enables precise sensor measurements and true analog waveform generation for audio, instrumentation, and closed-loop control projects.
- Qwiic / STEMMA QT Connector — The onboard Qwiic port lets you daisy-chain I2C sensors and displays with a snap-in cable, eliminating soldering entirely for rapid prototyping.
- CAN Bus Controller Onboard — Integrated CAN bus on D4/D5 enables vehicle and industrial communication protocols without an additional microcontroller — just add an external transceiver.
- Arduino IoT Cloud Ready — Connect, monitor, and automate devices remotely through the Arduino IoT Cloud platform with just a few lines of generated code and no extra hardware.
- Wide 6–24 V Input + USB-C — Power from any 6–24 V DC supply via the barrel jack, or directly from USB-C at 5 V — ideal for both bench work and field deployment.
- Full Arduino Uno Shield Compatibility — Identical form factor and 5 V pinout as the UNO R3 means every motor driver, relay, display, and sensor shield you already own works without modification.
Technical Specifications
| Specification | Details |
| Microcontroller | Renesas R7FA4M1AB3CFM (RA4M1) — 32-bit Arm Cortex-M4 @ 48 MHz with FPU |
| Wireless Module | ESP32-S3-MINI-1-N8 — Wi-Fi 4 (802.11 b/g/n, 2.4 GHz, up to 150 Mbps) + Bluetooth 5 |
| Flash Memory | 256 KB (RA4M1) + 8 MB (ESP32-S3) |
| SRAM | 32 KB |
| EEPROM (Data Flash) | 8 KB |
| Operating Voltage | 5 V (RA4M1 logic) / 3.3 V (ESP32-S3 internal) |
| Input Voltage | 6–24 V (barrel jack) / 5 V (USB-C) |
| Digital I/O Pins | 14 (D0–D13), 6 with PWM |
| Analog Input Pins | 6 (A0–A5) |
| ADC | 14-bit |
| DAC | 12-bit (A0) |
| Communication | 1× UART (D0/D1), 1× SPI (D10–D13 + ICSP), 1× I2C (A4/A5 + SDA/SCL), 1× CAN (D4/D5) |
| Qwiic Connector | 1× (I2C, 3.3 V) |
| Other Peripherals | RTC, OP AMP, MPU, CTSU (capacitive touch sensing), USB 2.0 Full-Speed (USBFS), VRTC, OFF pin |
| Onboard Hardware | 12×8 LED matrix (Charlieplexed, 96 individually addressable points) |
| USB | USB-C (programming + power) |
| Cloud Support | Arduino IoT Cloud |
| Shield Compatibility | All existing Arduino Uno shields |
| Origin | Made in India (ABX00087_IN) |
Common Applications & Use Cases
- IoT Sensor Nodes — Onboard Wi-Fi 4 and Arduino IoT Cloud integration let you deploy standalone sensor nodes reporting temperature, humidity, air quality, or motion to a cloud dashboard with no gateway hardware required.
- Home Automation Controllers — Control relays, dimmers, and smart switches over Wi-Fi or Bluetooth directly from the board, integrating with voice assistants and smartphone apps through the Arduino IoT Cloud.
- LED Matrix Displays & Animations — Program scrolling text, icons, and game graphics on the 12×8 LED matrix using the built-in library, or create real-time visualisations of sensor data without any external display hardware.
- Precision Analog Instrumentation — The 14-bit ADC provides 16× finer resolution than the classic 10-bit UNO, enabling accurate measurement of low-level signals from load cells, thermocouples, pH probes, and pressure transducers.
- Industrial CAN Bus Prototyping — The integrated CAN controller makes it straightforward to prototype automotive sensor networks, industrial fieldbuses, and equipment diagnostics — add a CAN transceiver and you're on the bus.
- Bluetooth Data Logging — Stream sensor readings wirelessly to a smartphone or tablet over Bluetooth 5 for cord-free bench measurements, patient monitoring demos, or mobile data collection in the field.
- Capacitive Touch Interfaces — The RA4M1's CTSU peripheral enables touch-sensitive pads without dedicated touch ICs, making it possible to build sleek capacitive user interfaces directly into enclosures and panels.
- Audio & Waveform Generation — The 12-bit DAC outputs smooth analog waveforms — sine, sawtooth, PWM audio — for tone generation, audio feedback circuits, and signal injection in test equipment designs.
- STEM Education & University Labs — Familiar Arduino syntax, rich peripheral set, and the 12×8 LED matrix make this an ideal teaching board for electronics, embedded systems, and IoT coursework at school and university level.
- Rapid Prototyping with Qwiic Sensors — The Qwiic connector enables snap-in attachment of I2C sensors, OLED displays, and GPS modules from SparkFun and Adafruit ecosystems, cutting wiring time to near zero during early prototyping.
What's in the Box
- Official Arduino UNO R4 WiFi EK (एक) — Made in India × 1
Note: accessories such as USB-C cables, power supplies, CAN transceivers, cases, and SD card modules are sold separately and not included unless stated above.
Frequently Asked Questions
Is the Arduino UNO R4 WiFi EK compatible with all existing Arduino Uno shields?
Yes — the UNO R4 WiFi EK uses the same form factor, pin layout, and 5 V operating voltage as the classic UNO R3, so every existing Uno shield plugs in without modification. Motor driver shields, relay boards, display shields, and sensor shields all work as expected. The RA4M1 runs on 5 V logic, matching the legacy shield standard. A small number of 3.3 V-only shields may require a logic level adapter on signal lines. Overall, the transition from R3 to R4 WiFi EK is seamless for the vast majority of existing projects.
What power supply does the Arduino UNO R4 WiFi EK require?
The board accepts three power inputs: a USB-C cable at 5 V, a standard 5.5 mm × 2.1 mm barrel jack accepting 6–24 V DC, or through the Vin header pin at 6–24 V. The onboard regulator steps the barrel jack input down to 5 V for the RA4M1 and 3.3 V for the ESP32-S3 module. For desktop programming and simple projects, a USB-C cable from your PC is sufficient. For field or high-current deployments, a 9 V or 12 V DC adapter via the barrel jack is the most practical option. Note that the USB-C cable is not included in the box.
Which IDE and software versions support the Arduino UNO R4 WiFi EK?
The board is fully supported by Arduino IDE 2.x and the Arduino CLI. Install the UNO R4 board package (version 1.0.0 or later) via the Arduino Board Manager by searching for "Arduino UNO R4." The board also works with PlatformIO and other IDEs that support the Arduino framework. ESP32-S3 wireless firmware can be updated over-the-air via the Arduino IDE's built-in OTA tooling. Because the EK (ABX00087_IN) is functionally identical to the global ABX00087, all board packages, libraries, and firmware releases apply without any modification.
How much memory does the Arduino UNO R4 WiFi EK have, and can it be expanded?
The RA4M1 MCU provides 256 KB Flash for program storage, 32 KB SRAM for runtime variables, and 8 KB Data Flash (EEPROM) for non-volatile settings. The ESP32-S3-MINI-1-N8 module adds 8 MB of dedicated SPI Flash used for Wi-Fi firmware and OTA payloads. There is no onboard SD card slot; for large data logging you will need an external SD card shield or module connected via SPI. The Data Flash supports at least 100,000 erase/write cycles, making it reliable for storing calibration data and project configuration.
What accessories do I need to get started with the Arduino UNO R4 WiFi EK?
At minimum you need a USB-C data cable (not included) to connect the board to your computer for programming. Download the free Arduino IDE 2.x, install the UNO R4 board package, and you can run basic sketches with no additional hardware. The built-in Wi-Fi, Bluetooth, and 12×8 LED matrix all work out of the box. For CAN bus projects, an external CAN transceiver module (e.g. MCP2551 or TJA1050) is required since the board provides only the CAN controller logic. Qwiic-compatible sensors and displays attach via the Qwiic connector with a snap-in cable and no soldering.
How does the Arduino UNO R4 WiFi EK compare to the original Arduino UNO R3?
The UNO R4 WiFi EK is a substantial upgrade in every dimension. The processor jumps from an 8-bit ATmega328P at 16 MHz to a 32-bit Arm Cortex-M4 at 48 MHz with hardware FPU, making it roughly 3× faster and capable of DSP and complex maths that would stall the R3. ADC resolution improves from 10-bit to 14-bit, and a 12-bit DAC is added where the R3 had none. Wi-Fi 4, Bluetooth 5, a 12×8 LED matrix, CAN bus, RTC, OP AMP, and a Qwiic connector are all new additions. The 5 V form factor, pinout, and Arduino IDE workflow remain identical, so existing projects migrate with minimal code changes.
How many GPIO pins and communication interfaces are available on the Arduino UNO R4 WiFi EK?
The board exposes 14 digital I/O pins (D0–D13, with 6 supporting PWM) and 6 analog input pins (A0–A5) that also function as digital I/O. Communication interfaces include 1× UART on D0/D1, 1× SPI on D10–D13 plus the ICSP header, 1× I2C on A4/A5 and the dedicated SDA/SCL pins, and 1× CAN bus on D4/D5. A Qwiic / STEMMA QT port provides a direct I2C connection at 3.3 V. Additional RA4M1 peripherals include CTSU capacitive touch sensing, an OP AMP, USB 2.0 Full-Speed device port, VRTC power pin, and a software-controlled OFF pin for power management.
Is the Arduino UNO R4 WiFi EK suitable for beginners, or is it aimed at advanced users?
The UNO R4 WiFi EK is designed for the full spectrum. Beginners can start with LED blink, sensor reads, and serial monitor exercises using familiar Arduino C++ syntax — the board package includes ready-to-use libraries for the LED matrix, Wi-Fi, Bluetooth, RTC, and IoT Cloud. Advanced users can leverage the 14-bit ADC, 12-bit DAC, CAN bus, capacitive touch, OP AMP, and the full ESP32-S3 wireless stack for professional-grade designs. STEM educators and university labs find it particularly effective for introducing 32-bit MCU programming without abandoning the Arduino ecosystem their students already know.
What is the most common mistake users make when setting up the Arduino UNO R4 WiFi EK?
The most common mistake is attempting CAN bus communication without an external transceiver. The RA4M1 includes only a CAN controller — you must add an external IC such as the MCP2551, TJA1050, or SN65HVD230 between D4/D5 and the physical bus to drive the differential CANH/CANL lines. A second common issue is using a charge-only USB-C cable, which powers the board but does not establish a programming connection — always use a full data-capable USB-C cable. Additionally, the ESP32-S3 module runs at 3.3 V internally; do not connect its pads directly to 5 V signals without a level shifter.
Where can I find documentation and community support for the Arduino UNO R4 WiFi EK?
Full documentation is available at docs.arduino.cc under the UNO R4 WiFi product page, including a cheat sheet, pinout diagram, and tutorials covering the LED matrix, Wi-Fi, Bluetooth, RTC, and IoT Cloud integration. The Arduino Forum and Arduino Discord server are active communities for troubleshooting and project sharing. Because the EK (ABX00087_IN) is functionally identical to the global ABX00087, every tutorial and firmware release applies without modification. A product-specific datasheet and schematic are linked in the Resources section of this product page for hardware reference.
