The classic Arduino Nano is the smallest board to build your projects with.

Looking at a variety of alternatives:

• Arduino Nano
• Arduino Nano 33 IoT (with Bluetooth, WiFi, Internet-of-Things)
• Arduino Nano 33 BLE (with Bluetooth)
• Arduino Nano 33 BLE Sense (with Bluetooth and embedded sensors)

References#

• Getting started with the Arduino NANO 33 BLE Sense
  • e.g., gyroscopeAvailable() in the BLE Sense library