WVS R7FA4 Plus B ESP32-S3FN8 Arduino UNO R4 WiFi Board

The WVS R7FA4 Plus B Development Board combines the processing capabilities of a Renesas RA4M1 microcontroller with the wireless connectivity of an Espressif ESP32-S3FN8 module. Designed in a form factor compatible with the Arduino UNO R4 WiFi, the board provides a flexible platform for embedded development, automation, robotics, IoT and connected maker projects.

The Renesas RA4M1 microcontroller uses a 32-bit Arm Cortex-M4 core running at 48MHz, while the onboard ESP32-S3FN8 provides dual-core 32-bit Xtensa LX7 processing with a clock frequency of up to 240MHz. The ESP32-S3FN8 adds 2.4GHz Wi-Fi and Bluetooth Low Energy connectivity, enabling wireless communication, remote monitoring and cloud-connected applications.

The board includes an onboard 12×8 red LED matrix for displaying animations, icons, messages or sensor data without requiring additional display hardware. It also features Qwiic connectors, VRTC and OFF pins, an ICSP interface, 5V/3.3V power headers, CAN bus, DAC functionality and operational amplifiers for expanded project flexibility.

With USB-C and external VIN power options, status indicators, a convenient lateral reset button and a low-profile DC jack, the R7FA4 Plus B is designed for both development and integration with expansion shields and experimental boards.

Key Features

• Based on the Renesas R7FA4M1AB3CFM RA4M1 microcontroller.
• Compatible with the Arduino UNO R4 WiFi form factor.
• 32-bit Arm Cortex-M4 main microcontroller.
• RA4M1 operating frequency of 48MHz.
• Onboard ESP32-S3FN8 dual-core 32-bit Xtensa LX7 module.
• ESP32-S3FN8 clock frequency of up to 240MHz.
• Integrated 2.4GHz Wi-Fi and Bluetooth Low Energy connectivity.
• Suitable for wireless monitoring and control applications.
• Compatible with cloud-connected IoT projects.
• Onboard 12×8 red LED matrix for graphics, animations and data display.
• Includes 256kB Flash and 32kB RAM on the RA4M1.
• ESP32-S3FN8 includes 384kB ROM, 512kB RAM and 8MB Flash.
• Provides DAC, CAN bus and operational amplifier functionality.
• 5V and 3.3V power headers for connecting expansion modules.
• Supports USB-C power input and external VIN power.
• Includes PWR, USER, RX and TX status indicators.
• Onboard ICSP interface that can also be used as an SPI interface.
• Lateral reset button for convenient access when shields are connected.
• Low-profile DC jack designed to reduce interference with shields.
• Supports user-soldered interfaces for experimental board connections.
• Compatible with a broad range of Arduino-style shields and accessories.

Technical Specifications

• Product Code: WVS R7FA4 PLUS B + ESP32-S3FN8
• Product Type: Microcontroller and wireless development board
• Main Microcontroller: Renesas R7FA4M1AB3CFM
• Main MCU Core: 32-bit Arm Cortex-M4
• RA4M1 Clock Frequency: 48MHz
• RA4M1 Flash: 256kB
• RA4M1 RAM: 32kB
• Wireless Module: ESP32-S3FN8
• ESP32-S3FN8 Core: Dual-core 32-bit Xtensa LX7
• ESP32-S3FN8 Clock Frequency: 240MHz
• ESP32-S3FN8 ROM: 384kB
• ESP32-S3FN8 RAM: 512kB
• ESP32-S3FN8 Flash: 8MB
• Wireless Communication: 2.4GHz Wi-Fi and Bluetooth LE
• Operating Voltage Options: 5V or 3.3V
• External Power Input: 6-24V
• VIN Specification: 6V VIN 21V as stated for the flexible VIN input
• Digital Pins: 14
• Analog Pins: 6
• DAC: 2
• PWM Channels: 6
• UART: 1
• I2C: 1
• SPI: 1
• CAN: 1
• I/O Output Current: 8mA
• LED Matrix: 12×8 red LED matrix
• Power Output Header: Selectable 5V or 3.3V output with common ground
• 5V Power Output: Up to 2000mA maximum
• Reset Button: Lateral-mounted
• DC Jack: Low-profile design
• ICSP Interface: Supported; can also be used as an SPI interface
• Experimental Board Support: Solder pads provided for DIY interface connections

Wireless and IoT Applications

The integrated ESP32-S3FN8 module allows projects to connect to wireless networks and communicate with other devices. This makes the board suitable for:

• Wi-Fi-enabled automation systems.
• Bluetooth Low Energy accessories and sensors.
• Remote monitoring and control.
• Arduino IoT Cloud projects.
• Smart home and building automation.
• Wireless sensor networks.
• Connected robotics.
• Industrial and environmental data collection.
• Internet-connected displays and dashboards.
• Remote equipment status monitoring.

Display and User Interface Features

The onboard 12×8 red LED matrix provides a convenient visual output for projects. It can be used to display:

• Animated patterns.
• Icons and symbols.
• Basic text and scrolling messages.
• Sensor readings.
• Device status information.
• Warnings and notifications.
• Simple graphical effects.

The PWR, USER, RX and TX indicators provide additional visual feedback for power status, user activity and serial communication.

Power and Expansion

The development board supports USB-C power input as well as external power through the VIN input. The onboard 5V/3.3V headers allow compatible expansion modules and shields to receive power from the board.

The 5V power output can provide up to 2000mA maximum, subject to the power source and board operating conditions. Always confirm the current requirements of connected accessories before powering them from the board.

The ICSP interface can be used for SPI-related applications, while the Qwiic connectors simplify the connection of compatible peripheral modules. Solder pads are also provided for users who want to create custom interfaces or connect the board to an experimental circuit board.

Applications

The WVS R7FA4 Plus B Development Board is suitable for:

• Embedded systems development.
• Arduino-compatible prototyping.
• IoT and connected device projects.
• Robotics and motion-control systems.
• Wireless sensor platforms.
• Smart home devices.
• Industrial automation prototypes.
• CAN bus experimentation.
• Audio and analogue signal projects using DAC and operational amplifiers.
• LED matrix displays.
• Educational electronics and programming.
• Custom hardware development.
• Cloud-connected monitoring and control systems.

Important Information

• Confirm the required voltage before connecting external power or expansion modules.
• Use compatible 5V or 3.3V accessories according to their electrical requirements.
• The stated VIN range contains two supplied values: an external power specification of 6-24V and a VIN guideline of 6-21V. Use the applicable board documentation to confirm the permitted input range for the intended connection.
• The maximum power output depends on the input supply, board design and connected load.
• Wireless performance depends on antenna conditions, network environment and software configuration.
• The board is supplied as a development platform; additional sensors, shields, cables and peripherals may be required for specific projects.

What's in the box
1 x WVS R7FA4 Plus B ESP32-S3FN8 Arduino UNO R4 WiFi Board