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This LED is connected to the Arduino’s digital input/output (I/O) pin 13. We ended that column by plugging one end of a flying lead into the header associated with this pin (the blue wire shown below) ...

The code initializes an Arduino object, specifies the digital pin connected to the LED, and toggles its state in a loop. As shown in the MATLAB code, the LED is wired to digital pin 13 of the Arduino ...