I'm a big fan of the Teensy, which is both a lot smaller than standard Arduino and (in the current version) a lot more powerful and easy to program. Not quite this small. But it retains USB ...

Arduino has introduced a Nano shaped board with a Wi-Fi and Bluetooth LE capable Espressif’s ESP32-S3 microcontroller, supporting it with the Arduino IDE and MicroPython. “Beginners can explore in an ...