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I really wanted to try Arduino, Arduino narrates a story where the good guys are winning. The Arduino Uno is a microcontroller board, based on the ATmega328P for Arduino UNO R3 or ATmega4809 for Arduino UNO WIFI R2 microcontroller by Atmel and was the first USB powered board of Arduino.
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Compatible with Arduino UNO R3, OPEN-SMART Rich UNO R3 is an ATMEGA328P development board with peripherals such as a 4 digit display, DS1307 clock, LM75 temperature sensor, infrared receiver, serial MP3 player, rotation angle sensor, 4-channel touch sensor. DFU programming the atmega16u2 on the Arduino UNO R3 If you don't know what the title means, then probably you don't need this information, I wanted to have my own MIDI instrument, so I had to reprogram the atmega16u2 chip on my Arduino UNO R3 board. This allows for faster USB transfer rates. Built on the Atmel ATmega328 microcontroller and USB-UART interface chip CH340G. There are people who use the Arduino for some serious electronics related stuff. The arduino UNO R3 is backwards compatible with the UNO - same driver, same uploading, same look. The board used the chip CH340G as converter UART-USB.
The Arduino Uno USB board is based on an AVR ATmega328 microcontroller running at 5V/16MHz. It's compatible with the previous one, but contains a few improvements in comparision to Duemilanove. The Arduino Uno pinout guide includes information you need about the different pins of the Arduino Uno microcontroller and their uses, power supply, analog and digital pins and ICSP. The guide also discusses different communication protocols used by the Arduino and a detailed diagram of the Arduino Uno board.