Waveshare R7FA4 PLUS B Development Board is an enhanced Arduino UNO R4 WiFi compatible development board built around the R7FA4M1AB3CFM microcontroller and an onboard ESP32-S3-MINI-1 wireless module. It combines the stability of the Renesas RA4M1 platform with 2.4GHz WiFi, Bluetooth LE, and a built-in 12 x 8 red LED matrix, making it a practical choice for IoT projects, wireless control panels, creative LED display experiments, sensor nodes, and education.

With 48MHz Arm Cortex-M4 processing, 256KB Flash, 32KB RAM, 14 digital pins, 8 analog pins, standard Arduino UNO R4 WiFi compatible headers, a Qwiic connector, and direct support for wireless expansion, the R7FA4 PLUS B development board is well suited for connected embedded applications that need both familiar Arduino-style development and ESP32-S3 based connectivity.

Features

• R7FA4M1AB3CFM / Renesas RA4M1 microcontroller with 32-bit Arm Cortex-M4 architecture and 48MHz main frequency
• ESP32-S3-MINI-1 onboard for 2.4GHz WiFi and Bluetooth LE wireless communication
• Arduino UNO R4 WiFi compatible form factor for easier shield integration and code migration
• 12 x 8 red LED matrix onboard for status display, simple animation, data indication, and interactive projects
• 256KB Flash and 32KB RAM on the RA4M1 side for control logic, sensor processing, and embedded application development
• Qwiic connector for fast I2C peripheral expansion
• USB Type-C for programming and serial debugging
• 6V to 21V external input for flexible power supply in bench and prototype setups
• 14 digital pins, 8 analog pins, UART, I2C, SPI, and PWM for broader hardware expansion
• Experimental solder pad area for DIY hardware interface extension

Specifications

Applications

• IoT development for wireless sensors, remote monitoring, and connected device control
• Arduino UNO R4 WiFi compatible prototyping for shield-based expansion and classroom development
• LED matrix interaction projects for animation, icon display, status indication, and simple dashboards
• Smart home and automation nodes using WiFi connectivity and serial peripheral expansion
• Wireless embedded education combining Renesas RA4M1 programming with ESP32-S3 connectivity
• Rapid hardware experiments with Qwiic sensors, displays, and Arduino ecosystem modules

Packing List

• R7FA4 PLUS B x1
• USB Type-A to Type-C cable x1

Other Content

Board hardware overview

The R7FA4 PLUS B board integrates the R7FA4M1AB3CFM MCU, ESP32-S3-MINI-1 module, MP8759 5V regulator, AMS1117-3.3 regulator, TXB0108DQSR voltage translator, Qwiic connector, USB Type-C programming interface, ICSP interface, power indicators, RX/TX indicators, user LED, Arduino-compatible headers, and a built-in 12 x 8 LED matrix for direct visual interaction.

Pinout definition

Outline dimensions

Wireless and display integration is the biggest advantage of the Waveshare R7FA4 PLUS B Development Board. The RA4M1 handles core embedded control while the ESP32-S3 adds wireless communication, and the onboard LED matrix gives this Arduino UNO R4 WiFi compatible board a more visual and interactive development experience without requiring an extra display module.

Resources

• Wiki
• Schematic
• Renesas RA4M1 Overview
• ESP32-S3 Overview
• Arduino UNO R4 WiFi Documentation
• Arduino IDE
• Qwiic Ecosystem

FAQ

What is the main difference between R7FA4 PLUS B and R7FA4 PLUS A?
R7FA4 PLUS B adds onboard ESP32-S3 wireless connectivity and a 12 x 8 red LED matrix, making it more suitable for wireless IoT projects and interactive display applications.

Can R7FA4 PLUS B be used like an Arduino UNO R4 WiFi compatible board?
Yes. The board is designed as an Arduino UNO R4 WiFi compatible development platform, so it is suitable for Arduino-style development, shield expansion, and connected embedded projects.

What can the onboard LED matrix be used for?
The onboard 12 x 8 red LED matrix can be used for icons, text effects, simple animations, status output, measurement indicators, and interactive visual feedback in creative or educational applications.