The Uno R3 is fully compatible to the Arduino Uno R3 and is equipped with an ATmega328P microcontroller in DIP package. It uses the Atmel ATmega16U2 controller as USB chipset and there is no need for driver installations. Just connect the board with the included USB cable to your computer and start right away programming and flashing your Uno R3 board.
Arduino Uno has a number of facilities for communicating with a computer, another Arduino/Genuino board, or other microcontrollers. The ATmega328 provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). An ATmega16U2 on the board channels this serial communication over USB and appears as a virtual com port to software on the computer. The 16U2 firmware uses the standard USB COM drivers, and no external driver is needed. However, on Windows, a.inf file is required. The Arduino Software (IDE) includes a serial monitor which allows simple textual data to be sent to and from the board. The RX and TX LEDs on the board will flash when data is being transmitted via the USB-to-serial chip and USB connection to the computer (but not for serial communication on pins 0 and 1).
Arduino Uno is a versatile and compact microcontroller development board based on the ATmega328 microcontroller. Arduino Uno is designed to make electronics easy for anyone to learn. Arduino Uno is equipped with 14 digital I/O pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.
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