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      The UNO is the best board to get started with electronics and coding. If this is your first experience tinkering with the platform, the UNO is the most robust board you can start playing with. The UNO is the most used and documented board of the whole Arduino family.


Arduino Uno is a microcontroller board based on the ATmega328P (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. You can tinker with your UNO without worring too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.

“Uno” means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved to newer releases. The Uno board is the first in a series of USB Arduino boards, and the reference model for the Arduino platform; for an extensive list of current, past or outdated boards see the Arduino index of boards.

The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.

With a 16 MHz clock speed, it’s able to perform instruction commands efficiently. Its 32 kB Flash memory gives it enough room for most sketches/code to upload into the Arduino Uno.

This version has the ATmega chip in a through-hole, so the chip can be easily replaced.


  • – ATmega328P Microcontroller (MCU)
  • – 5V operating voltage
  • – 6-20V input voltage (limit)
  • – 14 (with 6 providing PWM output) digital I/O pins
  • – Six analog input pins
  • – 20mA DC current per I/O pin
  • – 50mA DC current for 3.3V pin
  • – 32KB Flash memory (ATmega328P)
    • * 0.5KB used by bootloader
  • – 2KB SRAM (ATmega328P)
  • – 1KB EEPROM (ATmega328P)
  • – 16MHz clock speed
  • – 68.6mm x 53.4mm (Length x Width)
  • – 25g weight

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