The PicoCray project connects multiple Raspberry Pi Pico microcontroller modules into a parallel architecture leveraging an I2C bus to communicate between nodes.

The Raspberry Pi Pico is both faster and cheaper than the Arduino Nano, but the nano has better resources and community.

As for UARTs, the Raspberry Pi’s one-and-a-half UART interface has long been an issue in robotics and home automation applications.

Raspberry Pi Pico 2 is faster and backward-compatible, still only $5 The second generation of the popular hobbyist chip just dropped and it has significantly more power than its predecessor.