Project 3 - RGB LED's

Project 3 –Lighting up RGB LED’S

Molly explaining to me that her Pony has RGB LED's in
 them that use
similar programs that we wrote.

Hardware concepts we learned were:

• ·         How a RGB LED has a Red, Green, and Blue diode that can be used together to create any possible color
•  

Programming concepts we learned were:

• ·         Constant vs global vs local variables
• ·         Using subroutines (functions)
• ·         Using a For..To.. Loop with conditional statements

Our Program-  2 different programs.  The first one lights up each of the 9 “main” colors one at a time.  Then a “rainbow” program that goes though 768 different colors one by once, gradually going through the rainbow, turning on and off faster than the human eye can detect.

const int RED_PIN = 9;

const int GREEN_PIN = 10;

const int BLUE_PIN = 11;

int DISPLAY_TIME = 100; 

void setup()

{ pinMode(RED_PIN, OUTPUT);

  pinMode(GREEN_PIN, OUTPUT);

  pinMode(BLUE_PIN, OUTPUT);}

void loop()

{mainColors();

  showSpectrum();}

void mainColors()

{  digitalWrite(RED_PIN, LOW);

  digitalWrite(GREEN_PIN, LOW);

  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  digitalWrite(RED_PIN, HIGH);

  digitalWrite(GREEN_PIN, LOW);

  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  digitalWrite(RED_PIN, LOW);

  digitalWrite(GREEN_PIN, HIGH);

  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  digitalWrite(RED_PIN, LOW);

  digitalWrite(GREEN_PIN, LOW);

  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);

    digitalWrite(RED_PIN, HIGH);

  digitalWrite(GREEN_PIN, HIGH);

  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  digitalWrite(RED_PIN, LOW);

  digitalWrite(GREEN_PIN, HIGH);

  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);

  digitalWrite(RED_PIN, HIGH);

  digitalWrite(GREEN_PIN, LOW);

  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);

  digitalWrite(RED_PIN, HIGH);

  digitalWrite(GREEN_PIN, HIGH);

  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);}

 showSpectrum()

void showSpectrum()

{  int x; 

    for (x = 0; x < 768; x++)

  { showRGB(x);

    delay(10);     }}

void showRGB(int color)

{  int redIntensity;

  int greenIntensity;

  int blueIntensity;

  if (color <= 255)          // zone 1

  {    redIntensity = 255 - color;    // red goes from on to off

    greenIntensity = color;        // green goes from off to on

    blueIntensity = 0;             // blue is always off

  }

  else if (color <= 511)     // zone 2

  {    redIntensity = 0;                     // red is always off

    greenIntensity = 255 - (color - 256); // green on to off

    blueIntensity = (color - 256);        // blue off to on

  }

  else // color >= 512       // zone 3

  {    redIntensity = (color - 512);         // red off to on

    greenIntensity = 0;                   // green is always off

    blueIntensity = 255 - (color - 512);  // blue on to off

  }

  analogWrite(RED_PIN, redIntensity);

  analogWrite(BLUE_PIN, blueIntensity);

  analogWrite(GREEN_PIN, greenIntensity);}