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The word "uno" means "one" in Italian and was chosen to mark a major redesign of the Arduino hardware and software. [7] The Uno board was the successor of the Duemilanove release and was the 9th version in a series of USB-based Arduino boards. [8] Version 1.0 of the Arduino IDE for the Arduino Uno board has now evolved to newer releases. [4]
Arduino 68.6 mm × 53.3 mm [ 2.7 in × 2.1 in ] USB 32U4 [22] 5 V 32 1 2.5 20 7 12 July 23, 2012 [25] The Leonardo uses the ATmega32U4 processor, which has a USB controller built-in, eliminating one chip as compared to previous Arduinos. Arduino Uno [26] ATmega328P [27] 16 MHz Arduino 68.6 mm × 53.3 mm [ 2.7 in × 2.1 in ] USB-A
Arduino 3.2 in × 2.1 in [ 81.3 mm × 53.3 mm ] DE-9 serial connection native The first board labelled "Arduino". Arduino USB [45] Arduino Yes ATmega8 [44] 16 MHz Arduino 3.2 in × 2.1 in [ 81.3 mm × 53.3 mm ] USB FTDI FT232BM Arduino USB v2.0 Changed: USB replaces RS-232 interface, Improved: Arduino can be powered from host
ATmega328 is commonly used in many projects and autonomous systems where a simple, low-powered, low-cost micro-controller is needed. Perhaps the most common implementation of this chip is on the popular Arduino development platform, namely the Arduino Uno, Arduino Pro Mini [4] and Arduino Nano models.
Debugging requires a target chip with debug port and a debug probe. The official Arduino Zero board can be debugged out of the box. Other official Arduino SAMD21 boards require a separate SEGGER J-Link or Atmel-ICE. For a 3rd party board, debugging in Arduino IDE 2.0 is also possible as long as such board supports GDB, OPENOCD and has a debug ...
The Arduino Nano is an open-source breadboard-friendly microcontroller board based on the Microchip ATmega328P microcontroller (MCU) and developed by Arduino.cc and initially released in 2008. It offers the same connectivity and specs of the Arduino Uno board in a smaller form factor.