Put you multimeter is in continuity mode. The best way to distinguish between a common cathode and common anode RGB LEDs is using a multimeter. Distinguish between RGB LED common anode and common cathode With the LED facing you so the anode or cathode (the longest lead) is second from the left, the leads should be in the following order: red, anode or cathode, green, and blue. You can identify each lead by its length, as shown in the following figure. RGB LEDs have four leads-one for each LED and another for the common anode or cathode. This results in an LED that has 4 pins, one for each LED, and one common cathode or one common anode. In a common anode RGB LED, the three LEDs share a positive connection (anode). In a common cathode RGB LED, all three LEDs share a negative connection (cathode). The figure below illustrates a common anode and a common cathode LED. There are two kinds of RGB LEDs: common anode LED and common cathode LED. This is the simplest color mixing chart, but gives you an idea how it works and how to produce different colors. To have an idea on how to combine the colors, take a look at the following chart. To adjust the intensity of each LED you can use a PWM signal.īecause the LEDs are very close to each other, our eyes see the result of the combination of colors, rather than the three colors individually. To produce other colors, you can combine the three colors in different intensities. For a white light, you’d set all three LEDs to the highest intensity. With an RGB LED you can, of course, produce red, green, and blue light, and by configuring the intensity of each LED, you can produce other colors as well.įor example, to produce purely blue light, you’d set the blue LED to the highest intensity and the green and red LEDs to the lowest intensity. An RGB LED is shown in the following figure: You can produce almost any color by combining those three colors. How is this possible with just one single LED? In this article you’ll learn:Īn RGB LED is a combination of 3 LEDs in just one package: With an RGB LED you can produce almost any color.
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