The Arduino Uno SMD Edition features the same functionality as the standard Uno R3, but uses a surface-mount (SMD) version of the ATmega328P. It's perfect for projects needing a compact form factor and long-term durability.

The Arduino Uno R3 is a beginner-friendly, open-source microcontroller board based on the ATmega328P. Ideal for learning electronics, prototyping, and building real-world embedded systems, it's the most popular board in the Arduino family.

The Arduino Nano is a compact, breadboard-friendly microcontroller board based on the ATmega328P. It features 14 digital I/O pins, 8 analog inputs, PWM support, and USB connectivity, making it perfect for DIY electronics, robotics, automation, and IoT projects.