![]() The Arduino Uno R3 board has an In-Circuit Serial Programming (ICSP) header, which provides an interface for programming the microcontroller or communicating with other devices using SPI (Serial Peripheral Interface). Instead, it uses the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter. While the Uno communicates using the original STK500 protocol, it differs from all preceding boards because it does not use an FTDI USB-to-UART serial chip. The ATmega328 on the board comes preprogrammed with a bootloader that allows uploading new code without using an external hardware programmer. Version 1.0 of the Arduino IDE for the Arduino Uno board has now evolved to newer releases. The Uno board was the successor of the Duemilanove release and was the 9th version in a series of USB-based Arduino boards. The word "uno" means "one" in Italian and was chosen to mark a significant redesign of the Arduino hardware and software.
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