Then, chances are you already know what an Arduino is ... and A5 pins both double as SDA and SCL pins for I2C/TWI communication. However, the Nano offers a slight advantage as it has two more ...

The Arduino Nano and Raspberry Pi Pico have distinct pin configurations ... and SCK), and one I2C/TWI (pins A4 and A5 as SDA and SCL). The Pico, however, doubles these numbers.