Just wires, and it’ll most likely work. Now add a second device. The naïve solution found in thousands of Arduino tutorials do the same thing; just wires, and it’ll probably work.

Celebrate 20 years of Arduino software and tools with a spotlight aimed at industrial automation, AI, rapid prototyping and more. Since it began in 2014, Arduino Day has been an annual celebration ...

[Allan Schwartz] decided to document his experience using Fritzing to design, fabricate, and test a custom Arduino shield PCB, and his step-by-step documentation makes the workflow very clear.