Arduino® UNO R4 WiFi

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Description

The Arduino UNO R4 WiFi combines the processing power and exciting new peripherals of Renesas' RA4M1 microcontroller with the wireless connectivity power of Espressif's ESP32-S3. Additionally, the UNO R4 WiFi offers a built-in 12x8 LED matrix, Qwiic connector, VRTC, and OFF pin, covering all potential needs that makers will have for their next project.

With the UNO R4 WiFi, you can easily upgrade your project and add wireless connectivity to extend the reach of your current setup. If this is your first project, this board has everything you need to spark your creativity.

Let's explore what the UNO R4 WiFi offers:

• Hardware compatibility with the UNO form factor: The UNO R4 WiFi maintains the same form factor, pin layout, and 5V operating voltage as its predecessor, the UNO R3, ensuring a seamless transition for existing shields and projects.
• Expanded memory and faster clock: The UNO R4 WiFi boasts increased memory and a higher clock speed, allowing for more precise calculations and effortless handling of complex projects.
• Additional on-board peripherals: The UNO R4 WiFi introduces a range of on-board peripherals, including a 12-bit DAC, CAN BUS, and an OP AMP, providing extended capabilities and design flexibility.
• Extended 24V tolerance: The UNO R4 WiFi supports a wider range of input voltages, enabling seamless integration with motors, LED strips, and other actuators using a single power source.
• HID support: With built-in HID support, the UNO R4 WiFi can emulate a mouse or keyboard when connected to a computer via USB, making it easy to send keystrokes and mouse movements.
• Wi-Fi® and Bluetooth®: The UNO R4 WiFi hosts an ESP32-S3 module, allowing makers to add wireless connectivity to their projects. Together with Arduino IoT Cloud, makers can monitor and control their projects remotely.
• Qwiic connector: The UNO R4 WiFi features a Qwiic I2C connector, enabling easy connection to nodes in the extensive Qwiic ecosystem.
• Battery-powered RTC support: The UNO R4 WiFi includes additional pins, including an "OFF" pin to turn off the board and a "VRTC" pin to keep the internal clock running.
• LED matrix: The UNO R4 WiFi integrates a bright 12x8 red LED matrix, ideal for creative projects with animations or graphical representations of sensor data, eliminating the need for additional hardware.
• Runtime error diagnostics: The UNO R4 WiFi includes a fault detection mechanism that detects runtime crashes and provides detailed explanations and hints about the line of code causing the crash.

With all these features packed into the well-known UNO form factor, now is the perfect time to upgrade your project or start your maker journey. The UNO R4 WiFi offers unparalleled versatility and possibilities for makers of all levels.

If you're looking for a simpler version of the Arduino UNO R4, you can check out the Arduino UNO R4 Minima.

Specifications

To program the board, you need to install the "Arduino UNO R4 Boards" package.

Rewriting the Arduino UNO R4 WiFi Firmware:

The development board features two different microcontrollers: a Renesas RA4M1 and an ESP32-S3.

By default, the ESP32-S3 module acts as a serial bridge, handling the connection with your computer. It also manages restarting the main MCU, the Renesas RA4M1, when necessary—for example, when a new sketch is uploaded and a reset is required.

The UNO R4 WiFi also exposes the ESP32’s data lines, so you can program the ESP32 directly. These data lines are available via a 3x2 header at the top of the board.

WARNING:

Please note that the ESP32 comes with default firmware installed, set to communicate with the RA4M1 chip. Any direct programming of the ESP32 will erase that firmware, and the communication between the chips may be disrupted until the default firmware is restored.

Required Hardware and Software:

• Windows OS
• Arduino UNO R4 WiFi
• esptool

Step 1: Enter Programming Mode for ESP32

Ensure the development board is powered off and not connected to the PC.

To upload firmware to the ESP32-S3, you must put the chip in download mode by connecting the download pin to GND.
The download pin can be found on the 3x2 header at the top of the board (next to the USB port).

The simplest way is to use a female-to-female jumper wire and connect the indicated pins as shown in the image above. At this point, the board must be powered off. Once the pins are connected, you can plug the board into the PC and remove the jumper wire.

Check the Device Manager under Universal Serial Bus devices; it should appear as USB JTAG/serial debug unit.

Step 2: Upload Firmware

Download and extract the .ZIP file available at this LINK

Open your system’s terminal inside the extracted folder.

Hold the ⇧Shift key and right-click in an empty space inside the folder. In the context menu, select Open command window here / Open PowerShell window here.

Run the command: binespflash write-bin -b 115200 0x0 firmwareUNOR4-WIFI-S3-0.4.1.bin

After running the command, disconnect and reconnect the development board to your PC.

A new COM port should appear in the Device Manager, which you can now use to program the Arduino UNO R4 WiFi board.

PACKAGE CONTENTS:

1x UNO R4 WiFi development board

1x plastic support plate