ATmega328P UNO-R3 Development Board – Microcontroller Module for Beginners & Makers

Take your electronics projects to the next level with the ATmega328P UNO-R3 Development Board. Built around the powerful ATMEGA328P microcontroller, this development board delivers a clean, intuitive operating interface that's perfectly suited for beginners learning to code as well as experienced makers prototyping new ideas. Whether you're building sensors, robotics, automation systems, or interactive gadgets, this UNO-R3 board is your go-to platform.

Key Features

ATMEGA328P Processor: High-speed processing controller that powers a simple, easy-to-understand development environment — ideal for those just starting out in electronics and coding.
Enhanced I²C Pin Layout: Two dedicated I²C pins (SDA and SCL) have been added next to the AREF pins, providing cleaner connectivity for I²C-compatible peripherals and sensors.
IOREF Pin Added: An IOREF pin has been placed next to the RESET pin, allowing expansion boards (shields) to automatically adapt to the actual board operating voltage for maximum compatibility.
Wide Compatibility: Fully compatible with UNO-R3 shields, modules, and accessories, making it easy to expand your project.
2 Color Options: Choose the style that best fits your workbench or project aesthetic.
Ready to Use: Works right out of the box — connect via USB and start coding immediately with free open-source software.

Specifications

Microcontroller: ATmega328P
Board Version: UNO-R3
Interface: USB (for programming and power), I²C (SDA/SCL), SPI, UART
Operating Voltage: 5V (with IOREF for shield compatibility)
Digital I/O Pins: 14 (6 PWM outputs)
Analog Input Pins: 6
Available in 2 colors

Who Is This For?

The ATmega328P UNO-R3 is the perfect starting point for students, hobbyists, and professionals alike. It's widely used in electronics coursework, DIY automation, robotics kits, sensor integration, and maker projects of all kinds. The straightforward pin layout and broad software support make it one of the most popular development boards in the world.

Explore More from Our Electronics Collection

Looking for more components to complete your build? Check out these related products:

Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What is the ATmega328P UNO-R3 Development Board and what can I build with it?

A: The ATmega328P UNO-R3 Development Board is a versatile microcontroller platform powered by the ATMEGA328P chip. It's used to build a wide range of electronics projects including LED controllers, sensor arrays, robotics, home automation systems, and interactive prototypes. Its beginner-friendly design and broad compatibility with shields and modules make it one of the most popular development boards available.

Q: What improvements does the UNO-R3 version offer over previous versions?

A: The UNO-R3 version includes several key upgrades: two I²C pins (SDA and SCL) have been added next to the AREF pins for cleaner peripheral connections, and an IOREF pin has been added next to RESET, enabling compatible expansion shields to automatically match the board's actual operating voltage. These changes improve flexibility and compatibility with a wider range of add-on modules.

Q: Is this development board suitable for beginners?

A: Absolutely. The ATmega328P UNO-R3 is specifically designed with an intuitive, easy-to-understand interface that makes it one of the best choices for beginners learning electronics and programming. It works with free, open-source software and has a massive community of tutorials, guides, and project examples to help you get started quickly.

Q: What software do I need to program the ATmega328P UNO-R3 board?

A: The board is compatible with the widely-used open-source Arduino IDE, which is available for free on Windows, Mac, and Linux. Simply install the IDE, connect the board via USB, and you're ready to write, compile, and upload code to your board in minutes.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.