Arduino UNO R4 Minima / WiFi
by Arduino
SKU: PSA-CMP-UNO-R4
No reviews yetTypical India street price
₹1,800–₹4,500
Official UNO successor with Renesas RA4M1 — more RAM/flash, same shield shape.
Interface: GPIO, UART, I2C, SPI, CAN, (WiFi on WiFi model)
UNO remains the USB serial classroom board for many PSA starter activities.
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Concept
Same classroom form-factor as classic UNO with a modern 32-bit MCU underneath.
A little theory
Renesas RA4M1 (Arm Cortex-M4), 5 V-tolerant friendly shield ecosystem, DAC, CAN. WiFi variant adds ESP32-S3 co-processor for wireless. In the classroom, treat Arduino UNO R4 Minima / WiFi as a beginner part using GPIO, UART, I2C, SPI, CAN, (WiFi on WiFi model). Typical India street price is about ₹1800–₹4500. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Arduino IDE → UNO R4 Minima or UNO R4 WiFi. Many AVR sketches port with small changes.
Classroom & project use
- Shield-compatible labs
- School upgrade path from UNO R3
- WiFi dashboards (WiFi model)
Buying in India
Precautions
- Confirm Minima vs WiFi board selection
- Shield current limits still apply
Specifications
| MCU | RA4M1 |
| Logic | 5V |
| Form | UNO R4 |
| Flash | 256 KB |
| Category | Microcontrollers |
| Difficulty | Beginner |
| Voltage | 5V |
| Interface | GPIO, UART, I2C, SPI, CAN, (WiFi on WiFi model) |
Pinout
UNO form factor: D0–D13, A0–A5, ICSP, same silk family as R3 with extras on R4.
