The module used here is a self-contained, compact common-cathode module containing four 7-segment LED numeric displays. Each segment in the display module is multiplexed, meaning it shares the same ...

LEDs are specially made diodes to emit light when a potential is applied to its anode and cathode. The history of LED date backs to 1907 when Captain Henry Joseph observed the property of ...

i.e. from the anode terminal to the cathode terminal. But if the voltage is reversed, current won’t flow in the opposite direction. Et voila, a diode is born. An LED is a diode that emits light.