For most people starting out, the Arduino Uno R3 is the best choice. It has the largest library of tutorials, the most compatible shields, and enough I/O for almost any first project. Need something smaller for a wearable or a tight enclosure? Pick the Nano. Need more than 20 I/O pins for a larger build? Pick the Mega 2560. The comparison below covers every popular Arduino board to help you choose which Arduino board is right for you. New to Arduino altogether? Start with What is Arduino? for the fundamentals first.
Arduino board comparison
| Board | Microcontroller | Clock speed | Flash memory | SRAM | Digital I/O | Analog in | Operating voltage | Price (AUD) |
|---|---|---|---|---|---|---|---|---|
| Uno R3 | ATmega328P | 16 MHz | 32 KB | 2 KB | 14 (6 PWM) | 6 | 5V | $9.50 (compatible) |
| Uno R4 WiFi | RA4M1 (32-bit ARM) | 48 MHz | 256 KB | 32 KB | 14 (6 PWM) | 6 | 5V | $51.30 (official) |
| Nano | ATmega328P | 16 MHz | 32 KB | 2 KB | 14 (6 PWM) | 8 | 5V | $6.50 (compatible) |
| Mega 2560 | ATmega2560 | 16 MHz | 256 KB | 8 KB | 54 (15 PWM) | 16 | 5V | $20.70 (compatible) |
| Leonardo | ATmega32u4 | 16 MHz | 32 KB | 2.5 KB | 20 (7 PWM) | 12 | 5V | $11.30 (compatible) |
| Due | AT91SAM3X8E (ARM Cortex-M3) | 84 MHz | 512 KB | 96 KB | 54 (12 PWM) | 12 | 3.3V | $97.30 (official) |
Best Arduino board by use case
The Arduino Uno R3 is the standard recommendation for beginners. It uses the ATmega328P microcontroller and its pinout is what most tutorials, shields, and example sketches are written against, so it has the fewest compatibility surprises for a first project.
For a project that needs wireless connectivity without leaving the familiar Uno form factor, the Arduino Uno R4 WiFi adds a faster 32-bit processor, built-in WiFi and Bluetooth, and an onboard LED matrix, while keeping the same pinout as the original Uno.
For small or wearable projects where space is tight, the Nano packs the same ATmega328P as the Uno into a breadboard-friendly footprint small enough to fit inside compact enclosures.
For projects that need to control many sensors or motors at once, such as a CNC controller or a large robotics build, the Mega 2560 offers 54 digital I/O pins against the Uno's 14, along with far more flash memory and SRAM for larger sketches.
For USB HID projects, such as a custom keyboard, macro pad, or mouse emulator, the Leonardo has native USB support built into its ATmega32u4 chip, something the Uno's USB-to-serial chip cannot do.
For processing-heavy projects such as audio synthesis or fast sensor sampling, the Due's 84 MHz ARM core outperforms the AVR-based boards by a wide margin. Its I/O runs at 3.3V rather than 5V, so check that shields and modules are 3.3V-compatible before using one.
Compatible and clone boards
Alongside official Arduino boards, a large ecosystem of compatible boards exists that use the same microcontroller and pin layout while being manufactured by third parties. A compatible Uno R3, for example, functions identically to the official version, runs the same sketches, and works with the same shields and accessories, typically at a lower price point.
Compatible boards are a good option when budget matters more than official Arduino branding, since the underlying hardware and programming experience are the same. Official boards remain a solid choice for anyone who wants guaranteed build quality consistency or plans to use official Arduino shields that expect exact dimensional tolerances.
Compatible boards are the more popular choice among hobbyists and students, largely due to price, a compatible Uno costs a fraction of the official version while running identical code. Official boards still have a real edge in a few areas: they're built with higher quality components and tighter manufacturing tolerances, and they carry a longer manufacturer warranty than most third-party clones. For a first board to learn on, or for a classroom set where budget matters more than warranty length, compatible is the practical choice. For a board going into a permanent installation, a commercial product, or anywhere long-term reliability matters more than upfront cost, the official version is worth the difference.
Arduino Uno R3 vs Uno R4 WiFi
The Uno R3 remains the better default for most people starting out, not because it's more capable, but because it's what almost every tutorial, shield, and example project assumes you're using. The R4 WiFi is a genuine upgrade in raw specs: a faster 32-bit processor, more memory, and built-in WiFi and Bluetooth that the R3 doesn't have at all.
Code written for the R3 runs on the R4 WiFi without changes, since Arduino kept the same pin layout and sketch format across both boards. This makes the R4 WiFi the natural upgrade path once a project outgrows the R3's memory or needs wireless connectivity, rather than a board you need to learn separately. If a project has no need for WiFi or Bluetooth, the R3 is simpler, cheaper, and just as capable for everything else.
Frequently asked questions
Why is the Arduino Uno better than other microcontrollers?
The Uno isn't the most powerful board on the market. Its advantage is ecosystem size. Almost every Arduino tutorial, shield, and library targets the Uno first, so it has the fewest compatibility surprises for a first project. Boards like the ESP32 outperform it on clock speed, memory, and built-in WiFi, and are a better choice once a project needs wireless connectivity. The Uno remains the default recommendation for learning the platform itself.
Arduino vs ESP32: which should you pick?
Pick an Arduino Uno or Nano for learning fundamentals, teaching electronics, or projects with no need for WiFi. Pick an ESP32 board once your project needs WiFi, Bluetooth, or more processing headroom, since it outperforms the AVR-based Arduino boards on every spec while costing about the same.
Arduino vs Raspberry Pi: which should you pick?
Pick an Arduino for real-time hardware control, low power projects, and tasks that need precise timing, such as reading a sensor at exact intervals or driving a motor. Pick a Raspberry Pi for projects that need networking, a display, file storage, or software like Python, machine learning libraries, or a web server. Many advanced builds use both together, with the Arduino handling real-time hardware control and the Raspberry Pi handling higher level logic and connectivity.
Do all Arduino boards support C/C++?
Yes. Every board in this comparison, official or compatible, ships with a bootloader that allows it to be programmed directly through the Arduino IDE, and all of them are programmed using the same C/C++ based sketch format. This is what makes it straightforward to move a project from one board to a more capable one later without rewriting it from scratch.
What are the different types of Arduino boards?
Arduino boards fall into two broad categories. AVR-based boards, including the Uno R3, Nano, Mega 2560, and Leonardo, use 8-bit ATmega microcontrollers, run at 16 MHz, and operate on 5V logic. ARM-based boards, such as the Due and the Uno R4 WiFi, use 32-bit processors that run faster and handle more demanding sketches, with the Due operating on 3.3V logic. Within both categories you'll also find official boards and compatible third-party boards, which use the same microcontroller and pinout at a lower price.
Where to buy Arduino boards in Australia
Arduino boards, official and compatible, along with sensors, shields, and accessories, are available through the Zaitronics Arduino collection, with fast shipping across Australia.