Official Arduino Uno R3 Development Board with ATmega328P DIP

The reference Arduino board

The Arduino Uno R3 is built around the ATmega328P microcontroller and is one of the most widely used and documented boards in the hobbyist and education electronics space. It carries 14 digital input/output pins, 6 of which can be used as PWM outputs, 6 analog inputs, and a 16MHz resonator for its clock, alongside the usual USB connection, power jack, ICSP header and reset button.

As the listing puts it, the board includes everything needed to support the microcontroller: connect it to a computer with a USB cable, or power it with an AC-to-DC adapter or a battery, and it is ready to run. This official version uses the ATmega328P in a DIP (dual in-line package) form, meaning the chip is socketed rather than surface-mounted, so it can be removed and replaced by hand if it is ever damaged.

Specifications worth knowing

It runs at a 5V operating voltage, with a recommended supply voltage of 7 to 12V and an absolute maximum of 20V. Each I/O pin can supply up to 40mA, and the dedicated 3.3V pin can supply up to 50mA. Onboard memory is 32KB of flash, of which 0.5KB is used by the bootloader, along with 2KB of SRAM and 1KB of EEPROM.

The listing describes this as an original board made in Italy by Arduino officials, which is a point some buyers look for when choosing between genuine Arduino hardware and third-party clones, particularly for STEM education use where consistent quality across many boards matters.

Who it suits

Anyone starting out with Arduino, teaching electronics, or wanting a genuine reference board that matches the vast majority of published tutorials and shield documentation will find the Uno R3 the safest and most compatible starting point.

Questions buyers ask

What microcontroller does it use?

The ATmega328P, in a DIP (socketed) package.

How many I/O pins does it have?

14 digital I/O pins, 6 with PWM support, plus 6 analog inputs.

Is this an official Arduino board?

Yes, the listing describes it as an original board made in Italy by Arduino.