Arduino Uno R3 Compatible Board (ATmega328P)

Overview

The Uno R3 layout is the most common starting point for learning microcontrollers. This Arduino-compatible board is built around the ATmega328P running at 16 MHz and is programmed over USB from the free Arduino IDE, with thousands of libraries and examples available.

It provides 14 digital input/output pins (6 with PWM), 6 analog inputs, a reset button and an ICSP header in the standard Uno R3 shield layout, so Uno shields and most beginner tutorials work without changes. The board can be powered from USB or from an external 7-12 V DC supply.

Key Features

• ATmega328P microcontroller at 16 MHz, 5 V logic
• 14 digital I/O pins, 6 with PWM output
• 6 analog inputs
• 32 KB flash, 2 KB SRAM, 1 KB EEPROM
• USB programming from the Arduino IDE
• Standard Uno R3 header layout for shields

Typical Applications

• Learning programming and electronics
• School, college and university projects
• Sensor reading, LED, relay and motor control
• Prototyping before moving to a custom PCB

Compatibility

Works with the Arduino IDE and with Uno R3 shields and modules designed for 5 V logic, such as our 4-channel relay module. Some compatible boards use a different USB-to-serial chip from the original, which may need its driver on Windows.

Important Notes / Safety

• This is an Arduino-compatible board, not an official Arduino product.
• The I/O pins are 5 V logic. Drive motors, relays and other heavy loads through a driver or relay module, not directly from a pin.
• Keep external supply input within 7-12 V for normal use.