![]() At the end of this article, you will be able to play with multiple colors generated by the RGB LED. In this article, I will explain to you how an RGB LED can be operated using the Arduino Uno using two very basic examples for the same circuit connection. You can understand the structure of common cathode-type RGB LED using the image illustrated below. In the common cathode type, RGB LED all three colored LEDs leg shares a (negative) cathode connection. You can understand the structure of common anode-type RGB LEDs using the image illustrated below. In the common anode type, RGB LED all three colored LEDs leg shares a (positive) anode connection. You can identify the type of the RGB LED by using the multimeter in continuity mode or by reading the component data sheet provided by the manufacturing company. ![]() The third one is for green-colored LED and the fourth one is for blue-colored LED. The RGB LED has four legs, the first one is for red-colored LED, and the second one is for common anode or common cathode. There are two types of RGB LED one is a common anode type and the other one is a common cathode type. Common anode and common cathode type RGB LED: Similarly, if you need to generate white color, you would set all three LEDs with the highest intensity. If you want to produce red color, you will set the red LED at the highest intensity along with the green and blue LED with minimal (zero) intensity. We can generate any color by adjusting the brightness of each of the three LEDs of the RGB LED. RGB LED looks just like a regular LED or we can say that an RGB LED has three LEDs (red, green, and blue colored LED) inside a single packaged LED with four legs. RGB LED is the most amazing type of LED that can create millions of different shades of light colors using red, green, and blue colors. ![]() 470ohm) and you will measure a lower current flow and, of course, your LED look less bright.RGB LED is the abbreviation of ‘’Red Green Blue Light Emitting Diode’’. Try to measure voltage on resistor, and voltage on diode: it will be the same. If you have a digital/analog multimeter try to build the first 2 circuit in attachment (use 220ohm as resistor) and measure the current flow: It will be the same. Like Leon Heller say resistor and led are series-connected, both if you connect source/resistor/led/ground or source/led/resistor/ground, so the current flow will be the same. The commercial value of 220ohm would be fine. In a simple case as a 5v power from the resistance value is suitable: (5 - 1.5) V / 0.015A = 233ohm. a battery car) or the generator could be damaged.īecause the LED has a fixed voltage drop of 1.5V (it is a common value, but different LED could have different voltage drop) the resistance value to be used is calculated as as ohm laws tell. The LED might burn if the source can provide a lot of current (i.e. Without a resistance the LED would tend to absorb all of the current that the source (in our case the arduino pin which feeds it) can provide. To work properly a LED needs a current of about 15-20mA (or more if it is a high brightness LED). The role of resistance in a circuit powersource/resistance/LED/ground is essentially limiting the current that flows through the LED.
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