I used a 12VDC green LED plate with its power supply to conduct my first test. Below is a casual snap of that setup. This is a snip of my Arduino Serial Monitor readout (yes, it worked quite well): ...

The +5V supply line (VCC) of the module is linked to the 5V line of the Arduino. GND of the module is the common (0V) connection. The digital signal output to be detected (usually marked as DO in the ...

“Arduino does not manage the buck converter module but only measures output voltage and current through a current sensor and then shows those values on a display. Power value is showed too.