The powerful Arduino UNO R4 is the latest addition to the iconic Arduino UNO family. It even comes in two versions, so, let's take a look at the UNO R4 Minima and WiFi board.

The Arduino UNO R4 has an ARM Cortex-M4 Core

The two new UNO R4 boards feature a microcontroller from Renesas, the RA4M1. This 32-bit ARM Cortex-M4 runs at 48 MHz and has 32 KB of RAM and 256 KB of flash memory. This controller can be powered from 5 V whereas most other ARM-based microcontrollers require 3.3 V. This makes the MCU a suitable candidate for enhancing the 5-V, 8-bit AVR-based family of which the Arduino UNO R3 is a famous member.

The UNO R4 Minima board is of a similar design complexity as the Arduino UNO R3. To this, the UNO R4 WiFi adds an 8-by-12 LED matrix and an ESP32-S3-MINI-1 module. It also has a Qwiic-compatible I²C connector and a pin header to power the real-time clock.