Original Arduino UNO R4 WiFi Board - India
Original Arduino UNO R4 WiFi
The Arduino UNO R4 WiFi brings 32-bit performance, wireless connectivity, and an on‑board LED matrix to the classic UNO form factor. It combines a Renesas RA4M1 microcontroller with an Espressif ESP32‑S3 module for Wi‑Fi and Bluetooth® Low Energy, making it ideal for connected projects. With backward‑compatible shield headers and USB‑C, it’s a direct upgrade for any UNO‑based maker board.
Key Specifications
| Specification | Value |
|---|---|
| Microcontroller | Renesas RA4M1 (Arm Cortex‑M4 @ 48 MHz) |
| Wireless Module | ESP32‑S3 (Wi‑Fi 802.11 b/g/n, Bluetooth 5.0) |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Digital I/O Pins | 14 (6 PWM output) |
| Analog Input Pins | 6 (14‑bit resolution) |
What You Can Build With This
- Wi‑Fi‑controlled 12×8 LED matrix display
- IoT weather station that uploads data to the cloud
- Bluetooth‑controlled robot car
- Home automation relay hub with BLE smartphone control
Compatibility
The board is fully pin‑compatible with standard UNO R3 shields. Most 5 V logic shields work directly, but shields that tap I2C or SPI on the ESP32‑S3 may need 3.3 V level translation. It programs through Arduino IDE 2.0 and pairs seamlessly with popular sensor modules, motor drivers, and relay boards.
Wiring Notes
Use the USB‑C port on the RA4M1 side for power and programming. The Vin pin accepts 6–24 V DC from external supplies, regulated to 5 V and 3.3 V onboard. The 12×8 LED matrix is driven via an internal serial interface—no extra wiring needed. Keep total current draw below 200 mA when powered from USB.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino UNO R3 shields?
Yes, the physical headers and pinout match UNO R3. Some shields that use SPI or I2C may require library tweaks because the ESP32‑S3 handles wireless communication on the same buses; check the shield’s logic voltage levels for compatibility.
Can I program the ESP32‑S3 directly?
Absolutely. The ESP32‑S3 appears as a separate USB‑C port when you connect a second cable. You can program it using the Arduino ESP32 core, allowing custom firmware on the wireless module while the RA4M1 runs your main sketch.
What library controls the built‑in LED matrix?
The Arduino_UNO_R4_LED_Matrix library (included with the board package) handles the 12×8 red LED grid. You can display scrolling text, icons, or simple animations with just a few lines of code.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items