Arduino

By test , 9 June 2026

The Arduino UNO R4 WiFi is a powerful, connected microcontroller board. It pairs a 32-bit Renesas RA4M1 ARM processor with an ESP32-S3 module for Wi-Fi and Bluetooth. Retaining the classic UNO form factor, it adds a 12x8 LED matrix, a Qwiic I2C connector, and HID support.

Key Specifications

  • Main Processor: Renesas RA4M1 (Arm Cortex-M4 @ 48MHz)
  • Connectivity: ESP32-S3 for 2.4GHz Wi-Fi and Bluetooth 5 (BLE)
  • Memory: 256 KB Flash / 32 KB SRAM
  • Operating Voltage: 5V (but supports 6V to 24V inputs via the barrel jack/Vin)
  • Peripherals: 12-bit DAC, CAN bus, and Op-Amp.

Distinctive Features

  • Built-in LED Matrix: A 12x8 red LED grid directly on the board for displaying animations or sensor data.
  • Qwiic Connector: Allows plug-and-play connection to I2C sensors and modules.
  • Real-Time Clock (RTC): Dedicated VRTC pin to keep the internal clock running via a backup battery when main power is removed.
  • HID Support: Can emulate a mouse or keyboard directly over its USB-C connection.
  • Diagnostics: Features a built-in mechanism that catches runtime crashes and provides stack trace information.

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