Use your arduino to generate two opposing polarity signals. Apply one to a pin and then the other to all other pins, one at a time. Segments will start to light up if one of them is a com.
Do this to all pins.
Use your arduino to generate two opposing polarity signals. Apply one to a pin and then the other to all other pins, one at a time. Segments will start to light up if one of them is a com.
Do this to all pins.