Arduino Uno

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  • Arduino UNO is a very valuable addition in electronics that consists of a USB interface, 14 digital I/O pins(of which 6 Pins are used for PWM), 6 analog pins and an Atmega328 microcontroller. It also supports 3 communication protocols named Serial, I2C and SPI protocol.
  • Microcontroller Microchip ATmega328P
  • Operating Voltage 5V
  • USB Standard Type B
  • Digital I/O Pins 14
  • PWM Digital I/O Pins 6
  • Analog Input Pins 6
  • Flash Memory 32 KB
  • SRAM 2 KB
  • Clock Speed 16 MHz


  • The Arduino Uno is an open-source micro-controller board based on the Microchip ATmega328P micro-controller and developed by
  • The board is equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards (shields) and other circuits.
  • The software used for writing, compiling & uploading code to Arduino boards is called Arduino IDE (Integrated Development Environment), which is free to download from Arduino Official Site.
  • It has an operating voltage of 5V while the input voltage may vary from 7V to 12V.
  • Arduino UNO has a maximum current rating of 40mA, so the load shouldn’t exceed this current rating or you may harm the board.
  • It comes with a crystal oscillator of 16MHz, which is its operating frequency.
  • Arduino Uno Pinout consists of 14 digital pins starting from D0 to D13
  • t also has 6 analog pins starting from A0 to A5.
  • It also has 1 Reset Pin, which is used to reset the board programmatically. In order to reset the board, we need to make this pin LOW.
  • It also has 6 Power Pins, which provide different voltage levels.
  • Out of 14  digital pins, 6 pins are used for generating PWM pulses of 8-Bit resolution. PWM pins in Arduino UNO are D3, D5, D6, D9, D10 and D11.
  • Apart from USB, a battery or AC to DC adopter can also be used to power the board.
  • Arduino Uno comes with a USB interface i.e. USB port is added on the board to develop serial communication with the computer.
  • Atmega328 microcontroller is placed on the board that comes with a number of features like timers, counters, interrupts, PWM, CPU, I/O pins and based on a 16MHz clock that helps in producing more frequency and number of instructions per cycle.

Arduino UNO comes with 3 types of memories associated with it, named:

  • Flash Memory: 32KB
  • SRAM: 2KB

Arduino UNO supports 3 types of communication protocols, used for interfacing with third-party peripherals, named:

  • Serial Protocol
  • I2C Protocol
  • SPI Protocol

Package includes

  • 1 Arduino uno board
  • 1 USB cable