| Model | Microcontroller | Digital Pins | Analog Pins | Flash Memory | SRAM | EEPROM |
|---|---|---|---|---|---|---|
| UNO R3 | ATmega328 | 14 | 6 | 32K | 2K | 1K |
| Leonardo | ATmega32u4 | 20 | 12 | 32KB | 2.5KB | 1K |
| Mega 2560 | ATmega2560 | 54 | 16 | 256K | 8K | 4K |
| Nano | ATmega328/168 | 14 | 8 | 32/16K | 2/1K | 1K/512 |
| Mini | ATmega168 | 14 | 8 | 16K | 1K | 512 |