RGB LED(5mm)

This is a 4-pin RGB LED that expresses colors by adjusting the RGB values.

There are Cathode and Anode versions of the product; this document uses the Cathode version.

Specifications

• Operating Voltage [V]: Red (22.2), Green (33.2), Blue (3~3.2)
• Common Cathode type

Example Hardware Used

• Arduino board
• Jumper cables
• RGB LED
• Three 330-ohm resistors (100-ohm, 220-ohm resistors, etc., can also be used.)

Connection

The long leg is GND, and excluding the long leg, from left to right, it is R, G, B as shown in the image below.

Arduino	Resistor1	Resistor2	Resistor3	RGB LED
GND				GND
D11	Connected
D10		Connected
D9			Connected
	Connected			R
		Connected		G
			Connected	B

Example Code

This code sequentially lights up six different colors.

#define ledR 11
#define ledG 10
#define ledB 9

void brightness(int r, int g, int b) {
  analogWrite(ledR, r);
  analogWrite(ledG, g);
  analogWrite(ledB, b);
}

void setup() {
  brightness(0, 0, 0);
  delay(500);
  brightness(255, 0, 0);
  delay(500);
  brightness(0, 255, 0);
  delay(500);
  brightness(0, 0, 255);
  delay(500);
  brightness(255, 255, 0);
  delay(500);
  brightness(255, 0, 255);
  delay(500);
  brightness(0, 255, 255);
  delay(500);
  brightness(0, 0, 0);
}

void loop() {
}