![]() ![]() Connect one of the 470 ohm resistor leads to the bottom positive voltage rail. Because of this, it is connected to the top GND rail of the breadboard. In the above circuit, pin 2 of the RGB LED is the long pin. RGB LED Common Cathode Breadboard Test Circuit The following image shows the test for a common cathode RGB LED. ![]() Instead of using a multimeter, an RGB LED can be tested in a breadboard circuit. In this way each LED color lights up in turn. Place the black COM lead probe on each of the other open LED pins in turn. The LED lights up if it is a common anode device. Afterwards, place the probe of the black COM lead on one of the other LED pins. Place the probe of the red multimeter lead on the long RGB LED pin. Again, do the test with the LED plugged into a breadboard and the multimeter on the diode test setting. If the above test fails, then the RGB LED is probably a common anode device. In addition to determining if the RGB LED is common cathode, the test also shows which pin is for which color LED. Each other LED lights up assuming it is a common cathode LED. Touch the red lead probe on each other LED pin in turn. The LED lights up if it is a common cathode LED. Finally place the probe of the red multimeter lead on one of the other LED pins. Thirdly, place the probe of the black or COM multimeter lead on the long RGB LED pin. Secondly, put the multimeter on to the diode test setting. Multimeter on the Diode Test Setting Common Cathode RGB LED Testįirstly, plug the RGB LED into a breadboard to make it easier to test. The next paragraph describes the RGB LED multimeter test procedure. See the below image for a multimeter set on the diode test setting. Use the diode test to determine if the RGB LED is common anode or common cathode. That is, a diode symbol represents the diode test. Most multimeters have a diode test setting. For example, use a multimeter or breadboard circuit as described next. When a RGB LED comes in a kit or is bought without knowing the part number, test the LED to find out its pin numbering. The datasheet can only be found if the part number of the RGB LED is known. For example, the forward voltages of each LED in the RGB LED and maximum current rating. Datasheets contain the pin numbers of parts, and their electrical characteristics. Every electronic manufacturer supplies datasheets for its components that contain technical details for each component. The primary source of information on an RGB LED, or any electronic component, is from the manufacturer’s datasheet. Three methods to determine if a RGB LED is common anode or common cathode are firstly to check the datasheet, secondly test using a multimeter, and thirdly, test using a breadboard circuit. How to Test if a RGB LED is Common Anode or Common Cathode ![]() Once again, not all common cathode LEDs have the same pin numbering. In other words, pin 2 is the common cathode, or where the three LED cathodes join. As with the common anode above, this symbol has pin 2 as the common pin. That is, it is the schematic symbol or circuit diagram symbol of the common cathode RGB LED. The following image shows the internal wiring of a common cathode RGB LED. How to test the RGB LED follows the next subsection. It is important to note that not all common anode RGB LEDs have the same pin numbers. In other words, this is where all the anodes of the LEDs join. As can be seen in the symbol, pin number 2 is the common anode. That is, it is the schematic symbol or circuit diagram symbol. The following image shows the internal wiring of a common anode RGB LED. That article shows what an LED anode and cathode is. For more information on normal LEDs, see the article on the basics of LEDs for beginners. The following images show how the individual LEDs in a RGB LED are configured. Internal Wiring of RGB LEDsĪs already mentioned, an RGB LED has either a common cathode, or a common anode. After that, the next subsection looks at how to test if an RGB LED has a common anode or common cathode. The following subsection looks at the internal wiring of RGB LEDs. Other pins are the red, green and blue LED anodes. The longest pin of the RGB LED shown below is the common cathode pin. The following image shows a common cathode RGB LED, although a common anode RGB LED has a similar appearance. Alternatively it has all of the anodes joined together (a common anode RGB LED). It is basically three LEDs in a single package with either all the LED cathodes joined together (a common cathode RGB LED).
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