The latest version of the immensely popular development board Arduino UNO. Rev 4 is a modernized and refined variant of the classic, and instead of a 16MHz ATMega328P, we now find a 32-bit 48MHz ARM Cortex M4. In addition to a faster and more capable microcontroller, it also has more memory, a USB-C connector (with HID), improved power supply (6-24V in), CAN-BUS, 12-bit DAC, and an OP amplifier.
UNO Rev 4 is 100% backward compatible with the older UNO boards and has 5V GPIOs. All UNO-compatible shields and codebases also work with R4.

UNO R4 is launched in two versions, a simpler variant (Minima) for all projects based on previous UNO models but needing a bit more computational power and memory, and a variant with extended functionality (WIFI) for more advanced projects.

Features
* R7FA4M1AB3CFM#AA0
– 48 MHz Arm® Cortex®-M4 microprocessor with a floating point unit (FPU)
– 5 V operating voltage
– Real-time Clock (RTC)
– Memory Protection Unit (MPU)
– Digital Analog Converter (DAC)
* Memory
– 256 kB Flash Memory
– 32 kB SRAM
– 8 kB Data Memory (EEPROM)
* Pins
– 14x digital pins (GPIO), D0-D13
– 6x analog input pins (ADC), A0-A5
– 6x PWM pins: D3,D5,D6,D9,D10,D11
* Peripherals
– Capacitive Touch Sensing Unit (CTSU)
– USB 2.0 Full-Speed Module (USBFS)
– up to 14-bit ADC
– up to 12-bit DAC
– Operational Amplifier (OPAMP)
* Power
– Recommended input voltage (VIN) is 6-24 V
– 5 V operating voltage
– Barrel jack connected to VIN pin
– Power via USB-C® at 5 V
– Schottky diodes for overvoltage and reverse polarity protection
* Communication
– 1x UART (pin D0, D1)
– 1x SPI (pin D10-D13, ICSP header)
– 1x I²C (pin A4, A5, SDA, SCL)
– 1x CAN (pin D4, D5, external transceiver is required)