Logic voltage first, then pins, then the wireless it really has · review
An Arduino UNO R4 WiFi pairing a Renesas RA4M1 Arm Cortex-M4 microcontroller with an ESP32-S3 radio chip, with USB-C, CAN, a Qwiic connector, a 12-bit DAC and a 12 × 8 LED matrix on board.
The bottom line A familiar board with useful extras — CAN, Qwiic, DAC, LED matrix — and an IDE named in the title. Its listing leaves voltage and memory to Arduino’s documentation and drifts into marketing about AI.
Five bullets: a Renesas RA4M1 Arm Cortex-M4 microcontroller combined with an ESP32-S3 Wi-Fi and Bluetooth chip; Wi-Fi and Bluetooth 5.0 for IoT and remote control; USB-C, CAN support and a Qwiic connector; a 12-bit DAC and an integrated op-amp; and a 12 × 8 LED matrix on the board.
The RA4M1 runs the sketch; the ESP32-S3 handles the radio. Splitting the roles keeps the familiar Arduino programming model while adding Wi-Fi and Bluetooth, which is the design idea behind this board.
A Qwiic connector takes I2C sensors on a keyed cable, with no breadboard. CAN is the bus used in vehicles and machines. Both widen what the board connects to without extra shields.
The first bullet ends with AI applications. Nothing in the specifications supports that phrase, and the page reports the board by what it lists rather than by that claim.
At the last look-up, the German, French, Italian and Spanish Amazon stores were asking roughly 31 €.
It is sold in the American and British Amazon stores as well, in their own currency, which the euro figures above leave out on purpose.
Every figure here is Keepa’s reading on the date this page was last updated. Stock and prices can change at any time.
Prices quoted in this text were read on 15 September 2026. The live price is at the top of the page.
| Processor | Renesas RA4M1 (Arm Cortex-M4) microcontroller with an ESP32-S3 Wi-Fi and Bluetooth chip, first bullet |
|---|---|
| Logic voltage | Absent from the listing |
| Memory | Absent from the listing |
| Pin functions | CAN bus, Qwiic I2C connector, 12-bit DAC and integrated op-amp, third and fourth bullets |
| Wireless | Wi-Fi and Bluetooth 5.0, second bullet |
| USB connector | USB-C, third bullet |
| Programming environment | Arduino IDE, title |
| Amazon reference | B0C8V88Z9D (same reference on 6 Amazon marketplaces) |
| EAN | 7630049204591 |
The first bullet names a Renesas RA4M1 Arm Cortex-M4 microcontroller and an ESP32-S3 Wi-Fi and Bluetooth chip.
The third bullet describes it as a connector that simplifies adding I2C sensors and peripherals with less wiring.
3 boards · dual-core 32-bit, up to 240 MHz · Wi-Fi 2.4 GHz and Bluetooth · GPIO, SPI, I2C · USB-C · Arduino IDE compatible · OTA firmware updates
A pack of three ESP-32 development boards with dual-core 32-bit processors up to 240 MHz, Wi-Fi and Bluetooth, USB-C and Arduino IDE compatibility, whose listing gives no memory or pin counts.
Best for: A beginner or classroom starting with ESP32 in the Arduino IDE, with spare boards for experiments.
≈ £20 / 21 €
ESP32-S3, up to 240 MHz, ULP coprocessor · 512 KB SRAM, 8 M PSRAM · 45 programmable GPIO · 2.4 GHz Wi-Fi and Bluetooth 5 LE · no logic voltage, USB or IDE published
An ESP32-S3 development board on the WROOM-1-N16R8 module, with Wi-Fi, Bluetooth 5 LE, 45 programmable GPIO and external PSRAM, whose listing names neither its logic voltage, its USB connector nor a programming environment.
Best for: A maker who already works with ESP32 boards and wants an S3 with extra PSRAM at a low price.
≈ £8 / 9 €
ESP32-S3 · CC1101 named in the title · external antenna · open-source hardware · documentation on GitHub and wiki only · no memory, pins, voltage or radios detailed
An ESP32-S3 device from LILYGO with a CC1101 named in its title and an external antenna, sold as open-source hardware whose five bullets contain links to documentation rather than specifications.
Best for: An experienced maker who already knows the T-Embed platform and will read the GitHub repository before buying.
≈ $75 / £71 / 82 €
