The hardware setup is fairly simple – just connect A4, A5, power, and ground on both Arduinos ... From there you’ve nearly doubled the number of Arduino pins your project can control.

As seen in the picture above, you’ll sacrifice 2 analog pins, but if you happen to need IO and have an extra Arduino lying around, this could really help. [Rod] also notes that this method could ...

As a microcontroller with a limited number of I/O pins and no operating system ... in USB connector due to its lower power consumption. Another way Arduino simplifies power requirements is ...

In response to community feedback for more I/O options, Seeed Studio has recently launched the Seeed Studio XIAO Plus series ...