Arduino · current
Arduino UNO R4 WiFi
UNO-form-factor board with a Renesas RA4M1 (48 MHz Cortex-M4, 5 V) plus an ESP32-S3 module for Wi-Fi and Bluetooth, USB-C and a 12x8 LED matrix.
Evidence: Inferred 3 sources · latest retrieved 2026-10-18 · audited
Key specs
- Logic level
- 5 V Evidence: Documented
- MCU
- Renesas RA4M1 (R7FA4M1AB3CFM#AA0), Arm Cortex-M4 with FPU; ESP32-S3-MINI-1-N8 co-module Evidence: Documented
- CPU clock max
- 48 MHz Evidence: Documented
- Flash
- 256 KB Evidence: Documented
- SRAM
- 32 KB Evidence: Documented
- Digital IO pins
- 14 Evidence: Documented
Works with and related
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Alternative to
Arduino UNO R3
Evidence: Inferred
Same UNO form factor; successor/alternative reading is our inference (manual describes it as continuing the UNO line).
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Works with
Arduino IDE
Evidence: Documented
UNO R4 WiFi datasheet section 14.1: install the Arduino Desktop IDE to program the board while offline.
Suggested for: Log temperature over Wi-Fi, Compare boards: documented capabilities
All specifications 22
| Spec | Value | Evidence |
|---|---|---|
| MCU | Renesas RA4M1 (R7FA4M1AB3CFM#AA0), Arm Cortex-M4 with FPU; ESP32-S3-MINI-1-N8 co-module | Evidence: Documented |
| CPU clock max | 48 MHz RA4M1 main MCU | Evidence: Documented |
| Flash | 256 KB RA4M1 flash | Evidence: Documented |
| SRAM | 32 KB RA4M1 SRAM | Evidence: Documented |
| Eeprom | 8 KB 8 kB data flash used as EEPROM (manual sec. 5: "8 kB data flash (EEPROM)"); not a separate EEPROM chip | Evidence: Documented |
| Operating voltage | 5 V RA4M1 operating voltage fixed at 5 V; ESP32-S3 module is 3.3 V behind a logic-level translator | Evidence: Documented |
| Input voltage min | 6 V VIN / barrel jack | Evidence: Documented |
| Input voltage max | 24 V VIN / barrel jack | Evidence: Documented |
| Digital IO pins | 14 manual: 14 digital I/O ports | Evidence: Documented |
| Analog inputs | 6 manual: 6 analog channels | Evidence: Documented |
| Analog input resolution | 14 bit 14-bit ADC | Evidence: Documented |
| Analog outputs | 1 DAC up to 12-bit attached to A0 (manual section 9) | Evidence: Documented |
| USB connector | USB-C | Evidence: Documented |
| Wireless | Wi-Fi 802.11 b/g/n (2.4 GHz, up to 150 Mbps); Bluetooth 5 LE via ESP32-S3-MINI-1-N8 | Evidence: Documented |
| Operating temp min | -40 C | Evidence: Documented |
| Operating temp max | 85 C | Evidence: Documented |
| GPIO max current | 8 mA manual 11.3: GPIOs can safely handle up to 8 mA | Evidence: Documented |
| Esp32 s3 rom | 384 KB ESP32-S3-MINI-1-N8 module ROM | Evidence: Documented |
| Esp32 s3 SRAM | 512 KB ESP32-S3-MINI-1-N8 module SRAM | Evidence: Documented |
| Led matrix | 12x8 red LED matrix (96 LEDs, charlieplexed) | Evidence: Documented |
| Rtc battery pin voltage | 1.6-3.6 V (RA4M1 VBATT) Arduino manual only says VRTC = battery connection to power RTC only (no range). 1.6-3.6 V is the RA4M1 chip VBATT condition; the board VRTC pin is assumed to feed VBATT (not stated by Arduino), hence class 2. | Evidence: Inferred |
| Dimensions | 68.85 x 53.34 mm width x length (store tech specs) | Evidence: Documented |
Caveats
Single source: Arduino user manual ABX00087 (rev 8). Specs are for the RA4M1 main MCU unless stated; the ESP32-S3-MINI-1-N8 module datasheet was not fetched. logic_level_v=5 is from "VDD controls the logic level and is connected to the 5V power rail" (manual section 2 note). The 'current' status comes from the manual only; no Arduino product page was checked for lifecycle. No relation to ESP32-S3-WROOM-1 recorded: the board uses ESP32-S3-MINI-1-N8, a different module. UNO R3 shield compatibility is not stated in the fetched text and is not claimed. Pin-level details (pinout tables) not recorded. (2026-10-18) Added ESP32-S3 ROM/SRAM (manual sec. 6), LED matrix (sec. 8), VRTC range (class 2: Renesas RA4M1 VBATT, not Arduino-stated), dimensions (store page; datasheet drawing is an image). 14-bit ADC is the hardware capability; default Arduino core analogRead resolution not verified. CAN pins are inconsistent between feature list (D4/D5) and pin table (D13/D10) in the manual; not recorded.
Claims 6
UNO R4 WiFi is the first UNO board with a 32-bit microcontroller (Renesas RA4M1, 48 MHz Arm Cortex-M4) plus an ESP32-S3 Wi-Fi/Bluetooth module (ESP32-S3-MINI-1-N8). Evidence: Documented
Source: src-uno-r4-wifi-manual
The RA4M1 operates at a fixed 5 V while the ESP32-S3 module is 3.3 V; the two communicate through a logic-level translator. Evidence: Documented
Source: src-uno-r4-wifi-manual
Memory: 256 kB flash, 32 kB SRAM, 8 kB EEPROM (data memory). Evidence: Documented
Source: src-uno-r4-wifi-manual
Recommended input voltage on VIN/barrel jack is 6-24 V; the USB-C port should not be powered with more than 5 V. Evidence: Documented
Source: src-uno-r4-wifi-manual
Communication: 1x UART (D0/D1), 1x SPI, 2x I2C (incl. Qwiic), 1x CAN (external transceiver required); built-in 12x8 LED matrix. Evidence: Documented
Source: src-uno-r4-wifi-manual
The manual lists target areas as maker, beginner and education (vendor positioning, not an independent assessment). Evidence: Documented
Source: src-uno-r4-wifi-manual
Sources 3
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Arduino · datasheet
https://docs.arduino.cc/resources/datasheets/ABX00087-datasheet.pdf
Locator: Description; Features; 2 Recommended Operating Conditions; 11.3 Pin Current · Retrieved 2026-10-18
The RA4M1's operating voltage is fixed at 5 V, whereas the ESP32-S3 module is 3.3 V. ... 256 kB flash, 32 kB SRAM and 8 kB of EEPROM.
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Renesas · datasheet
https://www.renesas.com/en/document/dst/ra4m1-group-datasheet
Locator: Electrical characteristics: Conditions VBATT = 1.6 to 3.6 V · Retrieved 2026-10-18
VBATT = 1.6 to 3.6 V
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Arduino · manufacturer_docs
https://store.arduino.cc/products/uno-r4-wifi
Locator: Tech Specs: Memory; Dimensions · Retrieved 2026-10-18
ESP32-S3 384 kB ROM, 512 kB SRAM; Dimensions Width 68.85 mm Length 53.34 mm