# Arduino UNO R4 Minima > The affordable entry to Arduino's R4 generation — Renesas RA4M1 ARM Cortex-M4F at 48MHz with 256KB flash, 32KB SRAM, 12-bit DAC, CAN bus, op-amp, and USB-C in the classic UNO form factor at 5V. No wireless, pure microcontroller power. ## Quick Facts - **Brand:** Arduino - **Board Type:** dev-board - **Price:** ~$15.9 - **Product Readiness:** consumer - **CPU:** ARM Cortex-M4F @ 48MHz, FPU, DSP - **CPU Architecture:** ARM Cortex-M4F - **CPU Cores:** 1 - **RAM:** 32KB SRAM - **Flash:** 256KB,8KB EEPROM - **USB:** USB-C 2.0 (Full-Speed) - **Power:** 5V via USB-C or 6-24V via Vin - **Operating Voltage:** 5V - **Operating Temp:** -40°C to 105°C - **Dimensions:** 68.85 × 53.34mm - **Weight:** 25g - **Antenna:** No - **SD Card:** No ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** No ## Compatible Firmware arduino, micropython ## Use Cases - educational-platform - signal-generator - industrial-iot ## Components - **R7FA4M1AB3CFM** (mcu): Renesas RA4M1 ARM Cortex-M4F at 48MHz with FPU, DSP, 256KB flash, 32KB SRAM, 14-bit ADC, 12-bit DAC, CAN 2.0B, and USB 2.0 Full-Speed. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2Fra4m1-datasheet.pdf&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) ## Protocols - **SPI**: SS: D10, MOSI: D11, MISO: D12, SCK: D13 - **I2C**: SDA: A4/SDA, SCL: A5/SCL - **UART**: RX: D0, TX: D1 - **CAN**: CANRX: D4, CANTX: D5 - **DAC**: DAC0: A0 ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | D0 | RX — UART Receive | UART | digital-input, digital-output | | D1 | TX — UART Transmit | UART | digital-input, digital-output | | D2 | Digital I/O | | digital-input, digital-output | | D3 | PWM Output | PWM | digital-input, digital-output, pwm | | D4 | CAN RX | CAN | digital-input, digital-output | | D5 | CAN TX / PWM | CAN | digital-input, digital-output, pwm | | D6 | PWM Output | PWM | digital-input, digital-output, pwm | | D7 | Digital I/O | | digital-input, digital-output | | D8 | Digital I/O | | digital-input, digital-output | | D9 | PWM Output | PWM | digital-input, digital-output, pwm | | D10 | SPI SS / PWM | SPI | digital-input, digital-output, pwm | | D11 | SPI MOSI / PWM | SPI | digital-input, digital-output, pwm | | D12 | SPI MISO | SPI | digital-input, digital-output | | D13 | SPI SCK / LED | SPI | digital-input, digital-output | | A0 | Analog Input / DAC Output | ADC | digital-input, digital-output, adc, dac | | A1 | Analog Input | ADC | digital-input, digital-output, adc | | A2 | Analog Input | ADC | digital-input, digital-output, adc | | A3 | Analog Input | ADC | digital-input, digital-output, adc | | A4 | I2C SDA / Analog Input | I2C | digital-input, digital-output, adc | | A5 | I2C SCL / Analog Input | I2C | digital-input, digital-output, adc | ## Description ## Overview The Arduino UNO R4 Minima is the no-wireless sibling of the UNO R4 WiFi, delivering the same Renesas RA4M1 ARM Cortex-M4F microcontroller upgrade at a lower price point. Running at 48MHz with 256KB flash and 32KB SRAM, it offers a massive leap over the classic ATmega328P-based UNO R3 while maintaining full pin and shield compatibility. New peripherals include a 12-bit DAC for analog output, CAN 2.0B bus for industrial communication, an on-chip operational amplifier, and USB-C with HID support for keyboard/mouse emulation. The board accepts 6-24V input voltage, making it suitable for a wider range of power supplies. An SWD connector enables advanced debugging with external tools. The UNO R4 Minima is ideal for makers who want more processing power and modern peripherals without the added cost of WiFi/BLE connectivity. It runs the same Arduino IDE sketches and is fully compatible with the vast UNO shield ecosystem. ## Where to Buy - [Arduino Store (US)](https://openhardware.directory/r?to=https%3A%2F%2Fstore-usa.arduino.cc%2Fproducts%2Funo-r4-minima&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — $15.90 - [Arduino Store (EU)](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Funo-r4-minima&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — €17.57 - [DigiKey](https://openhardware.directory/r?to=https%3A%2F%2Fwww.digikey.com%2Fen%2Fproducts%2Fdetail%2Farduino%2FABX00080%2F20371540&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — $20.00 - [Mouser](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mouser.com%2FProductDetail%2FArduino%2FABX00080&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — $20.00 - [Amazon US](https://openhardware.directory/r?to=https%3A%2F%2Fwww.amazon.com%2Fdp%2FB0C8V5XLN4&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — $20.00 - [SparkFun](https://openhardware.directory/r?to=https%3A%2F%2Fwww.sparkfun.com%2Farduino-uno-r4-minima.html&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — $20.00 - [The Pi Hut (UK)](https://openhardware.directory/r?to=https%3A%2F%2Fthepihut.com%2Fproducts%2Farduino-uno-r4-minima&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) — £14.00 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Funo-r4-minima&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) - [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fhardware%2Funo-r4-minima%2F&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) - [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2FABX00080-datasheet.pdf&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) - [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fschematics%2FABX00080-schematics.pdf&ref=openhardware.directory&product=arduino-uno-r4-minima&source=md-export) ## Tags `arduino`, `uno-r4`, `arm-cortex-m4`, `renesas`, `can-bus`, `dac`, `usb-c` ## Images ![Arduino UNO R4 Minima](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-minima/3c20b6b78df6.jpg) ![Arduino UNO R4 Minima](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-minima/eb8b4e7f26b4.jpg) ![Arduino UNO R4 Minima](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-minima/759c1a7a3bbd.jpg) --- [View full device page](https://openhardware.directory/devices/arduino-uno-r4-minima)