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- The longest pin takes 5v in.
- Grounding the other three illuminate red, blue and green.
- You can use digital PWM outputs to ground those pins.
- Setting a pin to 0 illuminates that color. 1023, off.
- Setting a pin to an intermediate value adjusts its brightness.
//
// RGB LED figure-er-out-er by gabe. gms@causalloop.com
// an Arduino & Beer (tm) Production. blog.fnaard.com
//
// Run your RGB LED's longest pin to 5v. Run the other pins to digital
// pins 9, 10 and 11. I've put a 330 ohm resistor, in series, between
// each of those three pins and its corresponding digital pin.
//
// This sketch runs through pins 9, 10, 11 grounding each one in turn ..
// for sussing out which pin illuminates which color inside the thing.
//
// You gotta set all the pins to OUTPUT, so that you can write values
// to them. They won't actually output any voltage .. in fact, they'll
// act as ground. Setting a value for the pin will adjust its PWM rate
// and that adjusts how much electricity can flow through that color LED.
//
// Put simply, it's what you do with single-color LEDs, but in reverse.
void setup () {
pinMode ( 11, OUTPUT );
pinMode ( 10, OUTPUT );
pinMode ( 9, OUTPUT );
}
// Now just run through the pins, setting each one to full brightness (0)
// for a half second, while setting the other two to off (255).
void loop () {
analogWrite ( 11, 255 );
analogWrite ( 10, 255 );
analogWrite ( 9, 0 ); // Red, on mine.
delay(500);
analogWrite ( 11, 255 );
analogWrite ( 10, 0 );
analogWrite ( 9, 255 ); // Green on mine.
delay(500);
analogWrite ( 11, 0 );
analogWrite ( 10, 255 );
analogWrite ( 9, 255 ); // Blue on mine.
delay(500);
analogWrite ( 11, 255 );
analogWrite ( 10, 255 ); // Everyone off.
analogWrite ( 9, 255 );
delay(1000); // Pause longer. For dramatic effect.
}
