Description

The Arduino UNO R3 is by far one of the most popular Microcontrollers that you can purchase. This specific revision is based on the Original UNO R3 but with an ATEGA328P Processor. It keeps the classic UNO form factor and pinout, so every tutorial, shield, and accessory that works with an original UNO will work here too—no surprises, just plug-and-play.

Key features

• Microcontroller: ATmega328P

• Clock speed: 16 MHz

• Flash: 32 KB (≈0.5 KB used by bootloader)

• SRAM / EEPROM: 2 KB / 1 KB

• I/O: 14 digital pins (6 PWM), 6 analog inputs

• Operating voltage: 5 V logic

• Power options: USB-B or 2.1 mm DC barrel jack (recommended 7–12 V; board accepts ~6–20 V)

• On-board USB-serial: ATmega16U2 (or compatible) for reliable programming and serial monitor

• Headers & extras: ICSP header, reset button, auto-reset, onboard power/Tx/Rx LEDs, resettable USB polyfuse

• Dimensions: ~68.6 × 53.4 mm; standard UNO mounting holes

All of the items present in the photo are included.