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Of course, there’s nothing to stop you from using multiple microcontrollers — like the Arduino — together. ... Usually, when we see a cluster it uses Raspberry Pis. Or, sometimes, PCs.
Raspberry Pi also has a broader selection of I/Os, such as an audio jack, more USB ports, and more. And with 40 general-purpose I/O (GPIO) pins, you can even daisy chain multiple Raspberry Pis ...