Apple_Breath_RGB_LED.ino

/*
  Written by: Ho Yun "Bobby" Chan
  Modified: Dec 20, 2021
  @ SparkFun Electronics

  "Breathing sleep LED, like on a Mac."
  Originally Written By: Jeremy Saglimbeni 2011
  thecustomgeek.com

  Description: This sketch makes the LEDs breath like on a Mac.
  The code is modified to adjust for different colors on an
  RGB LED strip.

  -----RGB Common Anode LED Strip Connections-----
  RGB Common Anode LED Strip => BJT/MOSFET => Arduino
  R pin => transistor => 5
  G pin => transistor => 6
  B pin => transistor => 9
  - pin      
 
 License: ?
*/


// Define our LED pins:
#define redPin 5
#define greenPin 6
#define bluePin 9

// Create float variables for our LED color value:
int redValue = 1;
int greenValue = 1;
int blueValue = 1;

float tempRedValue = 1.0;
float tempGreenValue = 1.0;
float tempBlueValue = 1.0;

int brightness_LED = 0;

void setup() {

  Serial.begin(115200);
  Serial.println("Begin Breathing RGB LED");

  pinMode(redPin, OUTPUT);   // sets the red as output
  pinMode(greenPin, OUTPUT);   // sets the green as output
  pinMode(bluePin, OUTPUT);   // sets the blue as output

  // bring the LED up nicely from being off
  for (brightness_LED = 0 ; brightness_LED <= 15; brightness_LED += 1)
  {
    //CYAN
    tempRedValue = 0.0;
    tempGreenValue = 1.0;
    tempBlueValue = 1.0;

    redValue = int(tempRedValue * brightness_LED);
    greenValue = int(tempGreenValue * brightness_LED);
    blueValue = int(tempBlueValue * brightness_LED);

    show_RGB();

    delay(5);
  }
}//end setup()



void loop()
{
  for (brightness_LED = 15 ; brightness_LED <= 255; brightness_LED += 1)
  {

    //CYAN
    tempRedValue = 0.0;
    tempGreenValue = 1.0;
    tempBlueValue = 1.0;

    redValue = int(tempRedValue * brightness_LED);
    greenValue = int(tempGreenValue * brightness_LED);
    blueValue = int(tempBlueValue * brightness_LED);

    show_RGB();

    if (brightness_LED > 150) {
      delay(4);
    }
    if ((brightness_LED > 125) && (brightness_LED < 151)) {
      delay(5);
    }
    if (( brightness_LED > 100) && (brightness_LED < 126)) {
      delay(7);
    }
    if (( brightness_LED > 75) && (brightness_LED < 101)) {
      delay(10);
    }
    if (( brightness_LED > 50) && (brightness_LED < 76)) {
      delay(14);
    }
    if (( brightness_LED > 25) && (brightness_LED < 51)) {
      delay(18);
    }
    if (( brightness_LED > 1) && (brightness_LED < 26)) {
      delay(19);
    }
  }

  for (brightness_LED = 255; brightness_LED >= 15; brightness_LED -= 1)
  {

    //CYAN
    tempRedValue = 0.0;
    tempGreenValue = 1.0;
    tempBlueValue = 1.0;

    redValue = int(tempRedValue * brightness_LED);
    greenValue = int(tempGreenValue * brightness_LED);
    blueValue = int(tempBlueValue * brightness_LED);

    show_RGB();

    if (brightness_LED > 150) {
      delay(4);
    }
    if ((brightness_LED > 125) && (brightness_LED < 151)) {
      delay(5);
    }
    if (( brightness_LED > 100) && (brightness_LED < 126)) {
      delay(7);
    }
    if (( brightness_LED > 75) && (brightness_LED < 101)) {
      delay(10);
    }
    if (( brightness_LED > 50) && (brightness_LED < 76)) {
      delay(14);
    }
    if (( brightness_LED > 25) && (brightness_LED < 51)) {
      delay(18);
    }
    if (( brightness_LED > 1) && (brightness_LED < 26)) {
      delay(19);
    }
  }
  delay(970);

}//end loop()


void show_RGB() {
  //once value is calculated, show the LED color
  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}