RGB LED

Wiring Diagram

Program


//www.elegoo.com
//2016.12.8

// Define Pins
#define BLUE 3
#define GREEN 5
#define RED 6

void setup()
{
    pinMode(RED, OUTPUT);
    pinMode(GREEN, OUTPUT);
    pinMode(BLUE, OUTPUT);
    digitalWrite(RED, HIGH);
    digitalWrite(GREEN, LOW);
    digitalWrite(BLUE, LOW);
}

// define variables
int redValue;
int greenValue;
int blueValue;

// main loop
void loop()
{
    #define delayTime 10 // fading time between colors

    redValue = 255; // choose a value between 1 and 255 to change the color.
    greenValue = 0;
    blueValue = 0;

    // this is unnecessary as we've either turned on RED in SETUP
    // or in the previous loop ... regardless, this turns RED off
    // analogWrite(RED, 0);
    // delay(1000);

for(int i = 0; i < 255; i += 1) // fades out red bring green full when i=255
{
    redValue -= 1;
    greenValue += 1;
    // The following was reversed, counting in the wrong directions
    // analogWrite(RED, 255 - redValue);
    // analogWrite(GREEN, 255 - greenValue);
    analogWrite(RED, redValue);
    analogWrite(GREEN, greenValue);
    delay(delayTime);
}

redValue = 0;
greenValue = 255;
blueValue = 0;

for(int i = 0; i < 255; i += 1) // fades out green bring blue full when i=255
{
    greenValue -= 1;
    blueValue += 1;
    // The following was reversed, counting in the wrong directions
    // analogWrite(GREEN, 255 - greenValue);
    // analogWrite(BLUE, 255 - blueValue);
    analogWrite(GREEN, greenValue);
    analogWrite(BLUE, blueValue);
    delay(delayTime);
}

redValue = 0;
greenValue = 0;
blueValue = 255;

for(int i = 0; i < 255; i += 1) // fades out blue bring red full when i=255
{
    // The following code has been rearranged to match the other two similar sections
    blueValue -= 1;
    redValue += 1;
    // The following was reversed, counting in the wrong directions
    // analogWrite(BLUE, 255 - blueValue);
    // analogWrite(RED, 255 - redValue);
    analogWrite(BLUE, blueValue);
    analogWrite(RED, redValue);
    delay(delayTime);
}
}