The RGB LED will have four pins as shown in figure.
- PIN1: Color 1 negative terminal in common anode or color 1 positive terminal in common cathode
- PIN2: Common positive for all three colors in Common anode type or common negative for all three colors in common cathode type RGB LED.
- PIN3: Color 2 negative terminal or color 2 positive terminal
- PIN4: Color 3 negative terminal or color 3 positive terminal
So there are two types of RGB LEDs, one is common cathode type (common negative) and other is common anode type (common positive) type. In CC (Common Cathode or Common Negative). There will be three positive terminals each terminal representing a color and one negative terminal representing all three colors. The internal circuit of a CC RGB LED can be represented as below.
In Common Cathode type, If we want RED to be On in above, we need to power the RED LED pin and ground the common negative. The same goes for all the LEDs. In CA (Common Anode or Common Positive). There will be three negative terminals each terminal representing a color and one positive terminal representing all three colors.
The internal circuit of a CA RGB LED can be represented as shown in figure.
In Common Anode type, if we want RED to be on in above, we need to ground the RED LED pin and power the common positive. The same goes for all the LEDs.
In our circuit we are going to use CA (Common Anode or Common Positive) type. If you want to connect more RGB LEDs, say 5, then you need 5×4= 20 PINS usually, but we can reduce this PIN usage to 8 by connecting RGB LEDs in parallel and by using a technique called multiplexing.
1 x RGB LED Diode Lights (Red Green Blue)
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