Arduino UNO R4 WiFi Board (Generic) 

Product Description

The Arduino UNO R4 WiFi marks a major evolution of the classic UNO platform, introducing a powerful 32-bit architecture alongside integrated wireless connectivity. It combines the Renesas RA4M1 (R7FA4M1AB3CFM) microcontroller running a 48 MHz Arm® Cortex®-M4 processor with an onboard ESP32-S3-MINI-1-N8 WiFi module for seamless IoT capability. With significantly expanded memory compared to previous UNO boards, the R4 WiFi offers 256 kB Flash, 32 kB SRAM, and 8 kB EEPROM, providing more space for advanced applications and complex projects.

The RA4M1 operates at 5V DC, while the ESP32-S3 runs at 3.3V DC, with reliable communication between the two handled via an onboard logic-level translator for smooth integration.

The Arduino UNO R4 WiFi delivers enhanced performance, wireless functionality, and expanded flexibility making it ideal for IoT, automation, robotics, and advanced electronics projects.

Product Specs

• Brand: Arduino Clone (Not Original Arduino)
• Manufacturer: Unknown
• Model No: UNO R4 WiFi
• Main Microcontroller: Renesas R7FA4M1AB3CFM (48MHz Arm® Cortex®-M4 Core with a floating point unit)
• WiFi Co-Processor: ESP32-S3 (ESP32-S3-MINI-1-N8)
• Flash Memory (Code): 256kB
• SRAM: 32kB
• Flash Memory (Data / EEPROM): 8kB
• Input Voltage Range (DC Jack): 4V ~ 18VDC
• R7FA4M1 MCU Operating Voltage: 5VDC
• ESP32-S3 Operating Voltage: 3.3VDC
• USB Connector Type: Female USB Type-C Socket
• Digital I/O Pins: 14 – D0 to D13
• Analog Input Pins: 6 – A0 to A5
• PWM Output Pins: 6 – D3,D5,D6,D9,D10,D11
• Peripherals:
• Capacitive Touch Sensing Unit
• USB 2.0 Full Speed Module (HID Support)
• RTC (Real-Time Clock) & VRTC Pin (RTC Supply Voltage Pin)(
• Up to 14-bit ADC
• Up to 12-bit DAC
• Operational Amplifier
• 1x CAN Interface (D4,D5 – External transceiver required)
• 1x SPI (D10-D13 / ICSP Header)
• 1x I2C (A4,A5 / SDA,SCL / Qwiic Connecotr)
• 1x UART (D0,D1)
• Other Features:
• 12×8 Red LED Matrix (96 Pixels Total)
• OFF Pin which allows you to turn the board off
• DIP switch to switch USB port connection between RA4M1 processor and ESP32-S3
• Operating Temperature Range: -40°C to +85°C
• Dimensions: ~(68.58mm x 53.34mm x 15mm)
• ESP32-S3 Features / Specs
• Processor: ESP32-S3-MINI-1-N8 (Xtensa, Dual-Core 32-bit LX7 Microprocessor with single precision FPU, up to 240MHz)
• Flash Memory: 8MB (Quad SPI)
• ROM: 348kB
• SRAM: 512kB
• SRAM in RTC: 16kB
• WiFi Protocols: 802.11 b/g/n (802.11n up to 150 Mbps)
• Frequency Band: 2.4GHz (2412MHz ~ 2484MHz)
• Wireless Network Modes: Station / SoftAP / SoftAP + Station
• WiFi Security: Secure Boot / Flash Encryption / 4k-bit OTP, up to 1792 bits for users / Cryptographic Hardware Acceleration
• Bluetooth Protocols: Bluetooth LE – Bluetooth 5, Bluetooth Mesh
• Power: Up to 20dBm
• Speeds: 125kbps / 500kbps / 1MBps / 2MBps
• Advertising Features: Advertising Extensions / Multiple Advertising Sets
• Other Features: Internal co-existence mechanism allowing WiFi and Bluetooth to share a single antenna

Product Resources

Original Arduino UNO R4 WiFi Datasheet

Original Arduino UNO R4 WiFi Pinout

Original Arduino UNO R4 WiFi Product Page

Renesas RA4M1 Product Page

Espressif ESP32-S3-MINI-1(U) Datasheet v1.2

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