If you want use two Arduino, you can use a simple I/O port to communicate. The point of question is the Ground.
by Giovanni Gentile
Show status information, change NW credentials, ping your gateway, show sensor values or get more details by activating debugging…
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Explore secondary features of the Arduino Web Editor and become a pro using it.
Arduino recently launched support for programming ARM-based SBCs using the Arduino web editor, and Raspberry Pi is one of those SBCs.
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