What is RGB LED? | how it works?

 

What is RGB LED? | how it works?

 

HELLO FRIENDS.

 

RGB LED

 

An RGB LED, as name suggests is a special LED which is capable of producing all colors by mixing Red, Green and Blue colors.

In simple words It consists of 3 LEDs (Red, Green, Blue) together in a package and by variation of these 3 colors more colors can be formed.

 

An RGB LED is having 4 pins, one of which is a common anode and other 3 pins are for Red, Green and Blue respectively.

Or common cathode and other 3 pins are Red, Green, Blue.

 

So, to distinguish between common cathode and common anode RGB LEDs:

• Use a multimeter in continuity mode.
• If the LED lights up with the red tip on the longest lead and the black on one of the other leads – you have a common anode RGB LED
• If the LED lights up with the black tip on the longest lead and the red tip on one of the other leads – you have a common cathode RGB LED.

 

By manufacturers convention, the longest pin of LED is the one which is common anode for all three integrated LEDs.

 

This is the principle on which LED TV works.

 An LED TV contains millions of RGB LEDs very close of each other.

Each LED create one pixel of image.

According to the image, different voltage is applied on different LED and together they create a visual image, When looked from a distance we only see an image but when you look the screen from very close (maybe with a magnifying glass) you will observe LEDs.

 

NOW,

This is a demo circuit of

How RGB LED works.

 

Remember, it is just a demo. Don’t waste your money on making this circuit.

AIM:- To understand how colors of RGB LED changes

 

Components required:-

1pc RGB LED (common anode or common cathode).

1pc resistor (100Ω).

3pc preset (10kΩ).

3pc switch.

1pc battery (9v).

1pc battery cap.

& some wires.

 

It’s construction is simple as shown in fig.

But, if you have common anode rather then common cathode, you have to just change the terminals of battery.

 

WORKING:-

The switch turns a particular color LED.

Three switch for three colors.

Presets are used for changing the brightness of a particular colored LED.

The combination of different values of resistance, change the color of RGB LED.

 

THE COLOR CHART IS SHOWN BELOW FOR UNDERSTANDING BETTER.

 

 

There are other forms of RGB LEDs also available in market.

 

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