Rgb Led Pinout

Rgb led pinout

RGB LED's have four pins, one for each color and either a common anode (+, 3V3) pin or a common cathode pin (-, GND). In the Particle maker kit you have one RGB LED that uses a common anode (+) pin.

Why does RGB LED have 4 pins?

What is this? In a common cathode RGB LED, all three LEDs share a negative connection (cathode). In a common anode RGB LED, the three LEDs share a positive connection (anode). This results in an LED that has 4 pins, one for each LED, and one common cathode or one common anode.

Do you need 3 resistors for RGB LED?

You will need three resistors because the diode voltages differ. A 5V Arduino should be able to drive the LEDs though you will need to choose the resistor values carefully. Measure the resistor voltage drops at full on, calculate the current and adjust the resistor values if necessary.

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