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SMD RGB LED Module
1. Introduction
RGB LED module consists of a full-color LED made by R, G, B three pin PWM voltage
input can be adjusted. Primary colors (red / blue / green) strength in order to achieve
full color mixing effect. Control of the module with the Arduino can be achieved Cool
lighting effects.
Specification
Red Vf: 1.8 to 2.1V
Green Vf: 3.0 to 3.2V
Blue Vf: 3.0 to 3.2V
Red color: 620-625 nm
Green color: 520-525 nm
Blue color: 465-470 nm
Red brightness @ ~20mA: 600-800 mcd
Blue brightness @ ~20mA: 800-1000 mcd
Green brightness @ ~20mA: 1500-2000mcd
2. Pinout
Pin Name
Description
“R”
Red light
“G”
Green light
“B”
Blue light
“-”
Ground
3. Example
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In this example, we blink an LED and using an RGB LED we can generate any color we
want.
Here is the physical connection:
Code:
********Code begin********
int ledDigitalOne[] = {10, 11, 9}; //the three digital pins of the digital
LED
//10 = redPin, 11 = greenPin, 9 =
bluePin
const boolean ON = HIGH; //Define on as LOW (this is because we use
a common
//Anode RGB LED (common pin is connected to
+5 volts)
const boolean OFF = LOW; //Define off as HIGH
//Predefined Colors
const boolean RED[] = {ON, OFF, OFF};
const boolean GREEN[] = {OFF, ON, OFF};
const boolean BLUE[] = {OFF, OFF, ON};
const boolean YELLOW[] = {ON, ON, OFF};
const boolean CYAN[] = {OFF, ON, ON};
const boolean MAGENTA[] = {ON, OFF, ON};
const boolean WHITE[] = {ON, ON, ON};
const boolean BLACK[] = {OFF, OFF, OFF};
//An Array that stores the predefined colors (allows us to later randomly
display a color)
const boolean* COLORS[] = {RED, GREEN, BLUE, YELLOW, CYAN, MAGENTA, WHITE,
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BLACK};
void setup(){
for(int i = 0; i < 3; i++){
pinMode(ledDigitalOne[i], OUTPUT); //Set the three LED pins as
outputs
}
}
void loop(){
/* Example - 1 Set a color
Set the three LEDs to any predefined color
*/
setColor(ledDigitalOne, YELLOW); //Set the color of LED one
/* Example - 2 Go through Random Colors
Set the LEDs to a random color
*/
//randomColor();
}
void randomColor(){
int rand = random(0, sizeof(COLORS) / 2); //get a random number within
the range of colors
setColor(ledDigitalOne, COLORS[rand]); //Set the color of led one to
a random color
delay(1000);
}
/* Sets an led to any color
led - a three element array defining the three color pins (led[0] =
redPin, led[1] = greenPin, led[2] = bluePin)
color - a three element boolean array (color[0] = red value (LOW = on,
HIGH = off), color[1] = green value, color[2] =blue value)
*/
void setColor(int* led, boolean* color){
for(int i = 0; i < 3; i++){
digitalWrite(led[i], color[i]);
}
}
/* A version of setColor that allows for using const boolean colors
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*/
void setColor(int* led, const boolean* color){
boolean tempColor[] = {color[0], color[1], color[2]};
setColor(led, tempColor);
}
********Code End********
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