Arduino Uno vs Nano
Uno and Nano share the same ATmega328P brain — code you write for one runs on the other. Pick Uno if you're a beginner using a breadboard-plus-shield setup at a lab bench. Pick Nano when the project must be small enough to fit inside an enclosure.
| Feature | Arduino Uno R3 | Arduino Nano |
|---|---|---|
| MCU | ATmega328P | ATmega328P |
| Clock | 16 MHz | 16 MHz |
| Flash / SRAM / EEPROM | 32 / 2 / 1 KB | 32 / 2 / 1 KB |
| Digital I/O (PWM) | 14 (6) | 14 (6) |
| Analog inputs | 6 | 8 |
| USB | Type-B | Mini-B / Type-C |
| Form factor | 68 × 53 mm | 45 × 18 mm (breadboard) |
| Shield compatible | Yes | No |
| Best for | Beginners, labs | Compact final builds |
Pick Arduino Uno R3
You are a beginner or working in a college lab.
- Shield ecosystem
- Rugged form factor
- Every YouTube tutorial uses it
Pick Arduino Nano
You need the board inside a small enclosure.
- Sits on a breadboard
- Two extra analog pins
- Same code as Uno
FAQs
Is code portable between Uno and Nano?
Yes — both use ATmega328P. Just change the board selection in Arduino IDE.
Which is cheaper in India?
Nano clones are usually 20–30% cheaper than Uno clones. Original Arduino boards are pricier but well-tested.
