Arduino UNO R4 WiFi

Arduino
SKU: TH0742 MPN: ABX00087
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The Arduino UNO R4 WiFi is a powerful upgrade to the classic UNO board, featuring a RA4M1 Arm® Cortex®-M4 microprocessor for faster processing and a ESP32-S3 WiFi Module from Espressif. It maintains compatibility with existing shields and offers built-in features like a HID, DAC and RTC, making it ideal for both beginners and experienced makers.

Features

  • Renesas RA4M1 Arm® Cortex®-M4 microprocessor @ 48MHz with a floating point unit (FPU) @ 5V operating voltage
  • 2.4 GHz WiFi and Bluetooth 5.0
  • Real-time Clock (RTC)
  • Memory Protection Unit (MPU)
  • Digital Analog Converter (DAC)
  • HID support, built-in HID (Human Interface Device) support
  • 256 KB Flash, 32 KB SRAM
  • 14-bit ADC
  • 12-bit DAC
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Overview

The Arduino UNO R4 WiFi is a latest new upgrade to the popular Arduino UNO R3 board. UNO R4 has the same form factor as the UNO R3 measuring 68.58 x 53.34 mm in dimensions. UNO R4 WiFi comes with a Renesas RA4M1 (Arm® Cortex®-M4) a 32-bit microprocessor clocked at 48 MHz, expanded menory with 32kB of SRAM and 256kB of flash memory and supports 5V operating voltage and also hosts a ESP32-S3 module from Espressif which adds the functionality of wireless connectivity (WiFi and Bluetooth 5.0).

Apart from the improved performance and expanded memory, it has an onboard RTC (Real Time Clock), DAC (Digital to Analog Converter), 14-bit ADC (Analog to Digital Converter), OPAMP (Operational Amplifier) and a MPU (Memory Protection Unit). All these features eliminate the need for additional components in projects, simplifying the design process.

Also turn your UNO into a keyboard or mouse! The UNO R4 WiFi built-in HID support lets you control your computer directly with keystrokes and mouse movements when connected through USB. This opens up new possibilities for interactive projects and simplifies user input.

The UNO R4 WiFi user-friendly design makes it easy to learn for beginners, while its powerful features provide ample room for experienced users to explore more complex projects. Whether you're building a sophisticated robot with advanced motor control or developing a data logger that captures and analyzes intricate sensor readings, the UNO R4 has the power and memory to handle your project's needs.

Features

Microprocessor
  • Renesas RA4M1 Arm® Cortex®-M4 microprocessor @ 48MHz with a floating point unit (FPU) @ 5V operating voltage
  • Real-time Clock (RTC)
  • Memory Protection Unit (MPU)
  • Digital Analog Converter (DAC)
Memory
  • 256 KB Flash
  • 32 KB SRAM
  • 8 KB EEPROM
Pins
  • 14x Digital Pins (GPIO), D0 - D13
  • 6x Analog Input Pins (ADC), A0 - A5
  • 6x PWM Pins D3, D5, D6, D9, D10, D11
Peripherals
  • Capacitive Touch Sensing Unit
  • USB 2.0 Full Speed Module
  • 14-bit ADC
  • 12-bit DAC
  • Operational Amplifier (OPAMP)
Power
  • 6 to 24V Recommended Voltage
  • 5V Operating Voltage
  • Power via USB-C @ 5V
  • Overvoltage and Reverse Polarity Portection with Schottky Diodes
WiFi
  • Wi-Fi® support with 802.11 b/g/n standard (Wi-Fi® 4)
  • Bit rate at up to 150 Mbps
  • 2.4 GHz band
Bluetooth
  • Bluetooth® 5

Specification

Microcontroller Renesas RA4M1 (Arm® Cortex®-M4)
USB USB-C®
Pins 14x Digital I/O Pins
6x Analog Input Pins
1x DAC
6x PWM Pins
Communication 1x USB (Programming Port)
1x UART
1x I2C
1x SPI
1x CAN Bus
Input Voltage 6 to 24V
Operating Voltage 5V
ESP32-S3 is 3.3 V
Current per I/O Pin 8mA
Clock Speed 48 MHz
ESP32-S3 up to 240 MHz
Memory RA4M1
256 KB Flash
32 KB SRAM
8 KB EEPROM

ESP32-S3
384 kB ROM
512 kB SRAM
Dimensions 68.58 x 53.34 mm 

Board Layout

UNO R4 mechanical drawing and board layout.

Arduino UNO R4 WiFi Mechanical Drawing
Part Description
U1 R7FA4M1AB3CFM#AA0 Microcontroller IC
U2 NLASB3157DFT2G Multiplexer
U3 ISL854102FRZ-T Buck Converter
U4 TXB0108DQSR Logic Level Shifter
U5 SGM2205-3.3XKC3G Linear Regulator
U6 NLASB3157DFT2G Multiplexer
M1 ESP32-S3-MINI-1-N8
PB1 RESET Button
JANALOG Analog IO Headers
JDIGITAL Digital IO Headers
JOFF OFF, VRTC Header
J1 CX90B-16P USB-C® connector
J2 SM04B-SRSS-TB(LF)(SN) I2C connector
J3 ICSP Header (SPI)
J5 DC Jack
J6 ESP Header
DL1 LED TX
DL2 LED RX
DL3 LED Power
DL4 LED SCK

Pinout

Pinout for Arduino UNO R4 WiFi

Arduino UNO R4 WiFi Pinout
Power
Pin Function   Description
Analog Side
4 +3V3   +3V3 Output Power Rail
5 +5V   +5V Output Power Rail
6 GND   Ground
7 GND   Ground
8 VIN   Voltage Input
Digital Side
4 GND   Ground

Analog
Pin Function   Description
9 A0   Analog Input 0 / DAC
10 A1   Analog Input 1 / OPAMP+
11 A2   Analog Input 2 / OPAMP-
12 A3   Analog Input 3 / OPAMP Out
13 A4 / D18   Analog Input 4 / SDA
14 A5 / D19   Analog Input 5 / SCL

Digital
Pin Function   Description
1 SCL / D19   I2C Serial Clock
2 SDA / D18   I2C Serial Data
3 AREF   Analog Reference Voltage
5 D13 / SCK   GPIO13 / SPI Clock
6 D12 / CIPO   GPIO12 / SPI Controller In Peripheral Out
7 D11 / COPI   GPIO11 / SPI Controller Out Peripheral In
8 D10 / CS   GPIO 10 / SPI Chip Select
9 D9   GPIO 9 (PWM ~)
10 D8   GPIO 8
11 D7   GPIO 7
12 D6   GPIO 6 (PWM ~)
13 D5 / CANRX0   GPIO 5 (PWM ~) / CAN Transmitter (TX)
14 D4 / CANTX0   GPIO 4 / CAN Receiver (RX)
15 D3   GPIO 3 (PWM ~) / Interrupt Pin
16 D2   GPIO 2 / Interrupt Pin
17 D1 / TX0   GPIO 1 / Serial 0 Transmitter (TX)
18 D0 / RX0   GPIO 0 / Serial 0 Receiver (RX)

ICSP (SPI) Header

Pinout and pin position for ICSP Header

  RESET   SCK   CIPO
  GND   COPI   +5V

OFF, VRTC Header
  OFF For controlling power supply
  GND Ground
  VRTC Battery connection to power RTC only

Arduino UNO R4 vs UNO R4 WiFi vs UNO R4

Let's compare the all new UNO R4, UNO R4 WiFi and the world famous UNO R3.

  UNO R4 Wifi
New!
UNO R4 Minima
New!
UNO R3
Microcontroller Renesas RA4M1 (Arm® Cortex®-M4) Renesas RA4M1 (Arm® Cortex®-M4) ATmega328P (8-bit AVR® RISC-based microcontroller)
USB USB-C® USB-C® USB B Connector
Pins 14x Digital I/O Pins
6x Analog Input Pins
1x DAC
6x PWM Pins
14x Digital I/O Pins
6x Analog Input Pins
1x DAC
6x PWM Pins
14x Digital I/O Pins
6x Analog Input Pins
6x PWM Pins
Communication 1x USB (Programming Port)
1x UART
1x I2C
1x SPI
1x CAN Bus
1x USB (Programming Port)
1x UART
1x I2C
1x SPI
1x CAN Bus
1x USB (Programming Port)
1x UART
1x I2C
1x SPI
Input Voltage 6 to 24V 6 to 24V 7 to 12V (Recommended)
6 to 20V (limit)
Operating Voltage 5V 5V 5V
Current per I/O Pin 8mA 8mA 20mA
Clock Speed 48 MHz
ESP32-S3 up to 240 MHz
48 MHz 16 MHz
Memory RA4M1
256 KB Flash
32 KB SRAM
8 KB EEPROM

ESP32-S3
384 kB ROM
512 kB SRAM
256 KB Flash
32 KB SRAM
8 KB EEPROM
32 KB Flash
2 KB SRAM
1 KB EEPROM
Dimensions 68.58 x 53.34 mm  68.58 x 53.34 mm  68.58 x 53.34 mm 

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