The board has a set of connectors ... using an Arduino digital pin instead of the VCC pin to control the common anode signal of the LEDs. #include <ShiftOutX.h> #include <ShiftPinNo.h> // Digital pins ...

You can also go down more traditional routes, using trace code, where you print messages to the serial monitor, or signal through a GPIO pin that ... on the Arduino IDE 2, you generally need ...

Wyatt]’s CPUVolt library provides a fast way to measure voltage using no external components, and no I/O pin. It only applies to certain microcontrollers, but he provides example Arduino code ...