The Arduino UNO Original R3 is an original microcontroller board from Arduino officials based on the ATmega328P.
This Arduino UNO is integrated with 14 digital input output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button.
The UNO Original board contains everything needed to support the microcontroller, simply connect it to a computer with a USB cable.
The Arduino UNO R3 Original is the first microcontroller in the series of USB Arduino boards and is a reference model for the Arduino platform.