The RGB LED
The RGB led aka the tricolor led
is a led that can help generate a multitude of colors by mixing red,
blue & green colors. Its more like 3 leds (red, green & blue)
put together into a single led.
It has 4 pins with 1 of
the pins being a common cathode and the other 3 pins acting as anodes
for the 3 different colours. by varying the intensity of each of the 3
colours individually, we can generate various colours. This led is the
same as 1 pixel of a LED TV!.
Here is how to wire it up
 |
| Pin Mappings of the RGB LED |
 |
| Place resistor between the common cathode and the '-'ve terminal |
 |
| Connect RED to Pin 11, Blue to Pin 10 & Green to Pin 9 on the Arduino (these are PWM pins) |
Now try the following code first. This code is a normal digital control of all the three colors separately.[RGB_Blink.ino]
/*
RGB_Blink
Turns on each of the color spectrums for 4 seconds, repeatedly.
*/
void setup() {
// initialize the digital pins as an output.
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);
}
void loop() {
digitalWrite(9,LOW);
digitalWrite(11, HIGH);
delay(4000);
digitalWrite(11, LOW);
digitalWrite(10, HIGH);
delay(4000);
digitalWrite(10, LOW);
digitalWrite(9, HIGH);
delay(4000);
}
Next Lets get generating Colors, try the following code. Play around with the values and get yourselves comfortable.[RGB.ino]
/* RGB
Sets some random intensity value to the various colours of the RGB LED
*/
void setup()
{
}
void loop()
{
analogWrite(11,153);// Setting the voltage for Blue to around 3 Volts
analogWrite(10,51);// Setting the voltage for Red to around 1 Volt
analogWrite(9,51);// Setting the voltage for Green to around 1 Volt
}
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