Robotics and CAN-bus motor control
1 CAN interface — talk to motor drivers and ODrive/VESC-style controllers directly.
Engineering inference
Arduino SRL
Arduino UNO R4 WiFi
UNO-form-factor board: Renesas RA4M1 (48 MHz Cortex-M4F, 256 KB flash, 32 KB SRAM, 8 KB EEPROM) at 5 V logic, ESP32-S3-MINI-1-N8 Wi-Fi 4/BLE 5 co-processor, 12×8 red LED matrix, USB-C, Qwiic, CAN (external transceiver), DAC, OPAMP, 6–24 V VIN buck.
ABX00087Development boardPrice$27.50Arduino Store (USA) · in stock
Buy at Arduino Store (USA) Board essentials
Facts about the complete product. Unknown values remain open design questions.
- Exposed GPIO
- 20
- Board I/O voltage
- 5 V
- Board flash capacity
- 256 KiB
- Board SRAM capacity
- 32 KiB
- Board operating range
- -40 to 85 °C
A good fit for
Guidance to help you shortlist. The basis is shown for each recommendation.
Connected IoT devices and wireless sensor nodes
On-board radio: Wi-Fi 802.11b/g/n 2.4 GHz; Bluetooth 5 LE.
Engineering inferenceCustom USB devices (HID, MIDI, serial)
USB is on the main chip (R7FA4M1AB3CFM#AA0), so the board can enumerate as a keyboard, MIDI device or CDC serial port.
Engineering inference5 V sensors, shields and legacy peripherals
5.0 V I/O drives 5 V logic directly — no level shifting.
Engineering inferenceArduino shield ecosystem
Arduino Uno-compatible headers accept existing shields.
Engineering inferenceLearning and fast prototyping
Programs from Arduino IDE, Arduino Cloud.
Engineering inferenceInside this board
The board is the parent product. Each chip has its own memory, pins, capabilities and thermal limits.
main processor
R7FA4M1AB3CFP
Renesas Electronics
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--mcu- Architecture
- Arm Cortex-M4 with FPU
- Documented clock
- 48 MHz
- Chip / in-package flash
- 256 KiB
- On-chip SRAM
- 32 KiB
wireless module
ESP32-S3
Espressif Systems
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--m1- Architecture
- Xtensa 32-bit LX7 dual-core
- Documented clock
- 240 MHz
- On-chip SRAM
- 512 KiB
usb mux
NLASB3157DFT2G
onsemi
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--u2buck converter
ISL854102FRZ-T
Renesas (Intersil)
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--u3level translator
TXB0108DQSR
Texas Instruments
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--u4ldo regulator
SGM2205-3.3XKC3G/TR
SG Micro
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--u5usb mux
NLASB3157DFT2G
onsemi
d7ab09ed-3fb5-5dd1-ab76-4c0371b8eb5b--u6FAQ
Arduino UNO R4 WiFi questions
What microcontroller does the Arduino UNO R4 WiFi use?
The Arduino UNO R4 WiFi is built around the R7FA4M1AB3CFP, alongside ESP32-S3, NLASB3157DFT2G, ISL854102FRZ-T, TXB0108DQSR.
How many GPIO pins does the Arduino UNO R4 WiFi have?
20 GPIO pins are exposed. Xirkit documents 51 board pins, 33 of them with pin-level electrical limits.
Are the Arduino UNO R4 WiFi I/O pins 5 V tolerant?
2 pins are 5 V tolerant and 30 are not — check each pin in the pinout table before connecting 5 V signals.
How much current can a Arduino UNO R4 WiFi GPIO pin source?
Documented output-high current per pin: ≤ -4 mA. Values are traced to the chip datasheet; see the pinout table for per-pin limits and conditions.
What voltage powers the Arduino UNO R4 WiFi?
Supply range 1.6–24 V. Power inputs: VIN (6–24 V), VRTC (1.6–3.6 V).
How much does the Arduino UNO R4 WiFi cost?
From $27.5 at Arduino Store (USA). Prices are observed unit prices before tax and shipping.
What are the Arduino UNO R4 WiFi dimensions?
68.58 × 53.34 mm. A STEP model is available for enclosure fit checks.
Which interfaces does the Arduino UNO R4 WiFi support?
control, gpio, system, adc, dac, opamp, interrupt, touch, i2c, timer, pwm, uart_spi_i2c, spi, comparator, lcd, analog, can, led, usb_can, i2s, uart, power, jtag, gpio_matrix, clock, rtc_gpio, usb.
How do I program the Arduino UNO R4 WiFi?
Supported frameworks: Arduino IDE, Arduino Cloud.
Where does this Arduino UNO R4 WiFi data come from?
Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.
Data & sources
Where these values come from
- Arduino UNO R4 WiFi datasheet — Arduino SRL
- Arduino Store (USA) listing