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8mm RGB LED (Common Cathode) 8-pack

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Huge 8mm RGB (Red Green Blue) LEDs in a 4-pin package with a common cathode (negative) connection. Great for building colourful displays or status indicators that change colour! Comes in a handy 8-pack.

The "cathode" is the negative side of the LED, so having a common cathode means you can connect the cathode pin to 0V (GND) and then switch on the individual RGB elements by connecting their pins to +V using current limiting resistors. Using PWM pins on your Arduino you can then blend the red, green and blue colours together to create any colour you like.