The Arduino Uno R3 development board uses Atmel’s ATmega328 microcontroller. Total Digital pins count 14 that can be used as inputs and outputs. UNO has 6 pins for PWM outputs and 6 pins has analog inputs. The Arduino Uno R3 can be connected to a computer with USB A to B type cable. It can be powered via USB or external DC power supply.
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This is Arduino UNO R3 development board based on Atmel’s DIP ATmega328P 8-bit microcontroller with 32KB of Flash memory and 2KB of RAM. With the power of 16 MHz clock speed and the facility for directly connect to any computer via an USB cable, Arduino UNO can be used for learning how sensors and actuators work or for your rapid prototyping electronics projects.
Arduino UNO R3 contains everything which are needed to support the microcontroller. It can be powered via a USB cable or with a recommended DC adapter. The Arduino UNO is the excellent board for electronics startups. It is the most documented and popular board that you can always get helpful community support.