RGB Eyes

// Defining the led pins variables
#define RED RED_LED // red led
#define GREEN GREEN_LED // green led
#define BLUE BLUE_LED // blue led
#define DELAYTIME 5 // delay time

// Introducing global variables to keep track of the RGB values and starting value RGB value
int redVal;
int greenVal;
int blueVal;
int rgbVal = 0;
/* each rgbVal corresponds to a certain color red = 0, orange = 1, yellow = 2, green = 3
aqua = 4, blue = 5, purple = 6, pink = 7. Each rgbVal keeps track of the fade to the next
color through if statements in void loop(), such that red goes to orange, orange goes to
yellow, and so on until it gets to pink and goes back to red*/

const int switch_pin = 6; // the pin the tilt swtich is connected to 

// Max LED value
int max_LED = 255;

void setup() {
  // put your setup code here, to run once:
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  pinMode(switch_pin, INPUT_PULLUP); 
  // reads LOW when the tilt switch is level and HIGH when the it is tilted

  // Test Red
  digitalWrite(RED, HIGH);
  digitalWrite(GREEN, LOW);
  digitalWrite(BLUE, LOW);
  delay(500);
  
  // Test Green
  digitalWrite(RED, LOW);
  digitalWrite(GREEN, HIGH);
  digitalWrite(BLUE, LOW);
  delay(500);
  
  // Test Blue
  digitalWrite(RED, LOW);
  digitalWrite(GREEN, LOW);
  digitalWrite(BLUE, HIGH);
  delay(500);
}

void loop() {
  // loop to run the fading lights continuously
  int tilt_state = digitalRead(switch_pin); // checking the state of the tilt switch
  if (tilt_state == HIGH) { // If the switch is tilted, it turns off all of the lights
    analogWrite(RED, LOW);
    analogWrite(GREEN, LOW);
    analogWrite(BLUE, LOW);
  }
  else { // Fades the lights if the switch is level
    if(rgbVal == 0) { // transition from red to orange
      redVal = 256;
      greenVal = 0;
      blueVal = 0;
      for(int i = 0 ; i < 86 ; i += 1) {
        redVal -= 1;
        greenVal += 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }
    
    else if(rgbVal == 1) { // transition from orange to yellow
      redVal = 171;
      greenVal = 85;
      blueVal = 0;
      for(int i = 0 ; i < 87 ; i += 1) {
        greenVal += 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }

    else if(rgbVal == 2) { // transition from yellow to green
      redVal = 170;
      greenVal = 170;
      blueVal = 0;
      for(int i = 0 ; i < 86 ; i += 1) {
        redVal -= 2;
        greenVal += 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }

    else if(rgbVal == 3) { // transition from green to aqua
      redVal = 0;
      greenVal = 256;
      blueVal = 0;
      for(int i = 0 ; i < 86 ; i += 1) {
        greenVal -= 1;
        blueVal += 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }

    else if(rgbVal == 4) { // transition from aqua to blue
      redVal = 0;
      greenVal = 170;
      blueVal = 85;
      for(int i = 0 ; i < 86 ; i += 1) {
        greenVal -= 2;
        blueVal += 2;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }

    else if(rgbVal == 5) { // transition from blue to purple
      redVal = 0;
      greenVal = 0;
      blueVal = 256;
      for(int i = 0 ; i < 86 ; i += 1) {
        redVal += 1;
        blueVal -= 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }

    else if(rgbVal == 6) { // transition purple to pink
      redVal = 85;
      greenVal = 0;
      blueVal = 171;
      for(int i = 0 ; i < 87 ; i += 1) {
        redVal += 1;
        blueVal -= 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal += 1;
      delay(DELAYTIME);
    }

    else if(rgbVal == 7) { // transition pink to purple
      redVal = 170;
      greenVal = 0;
      blueVal = 85;
      for(int i = 0 ; i < 86 ; i += 1) {
        redVal += 1;
        blueVal -= 1;
        analogWrite( RED, redVal ); // set the new red value
        analogWrite( GREEN, greenVal ); // set the new green value
        analogWrite( BLUE, blueVal ); // set the new blue value
        delay(DELAYTIME); // delays the color change
      }
      rgbVal = 0;
    }
  }
 }