![]() An anode is a positive terminal and we connect positive terminal of power supply to this terminal. Similarly, we connect the negative terminal with the cathode. Secondly, we can identify cathode from the flat surface and another one will anode legīefore interfacing LED with Pic microcontroller, we should find its forward current and forward voltage.The longer lead always an anode terminal and shorter one is a cathode.While using an actual LED, we can find cathode and anode terminal in two ways. The intensity of lights that emits from it depends on the forward current. Greater the forward, the higher will be light intensity. But every device has a peak forward current and voltage. It cannot withstand the current and voltage greater than the peak value.įor example, if we use a RED_LED that has a brightness of 5MCD, it will operate at 10mA current. ![]() Note: millicandela is a light intensity unit that is used to measure light brightness. ![]() The forward voltage depends on the color and size of an LED. This table shows the forward voltage drop of different color LEDs according to color and size. Therefore, we can conclude from the above table that the average forward voltage drop is about 2V. ![]() The typical forward current is about 10mA.
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