// declaration of pins
unsigned int orangePin = 5;
unsigned int violetPin = 4; 
unsigned int bluePin = 3; 


//declaration of button
int button = 21; 


//PWM Values
const int maxDC = 255;              //max Duty Cycle = maxDC
const int minDC = 0;

void setup() {
  // setup mode for pins
pinMode(orangePin, OUTPUT);
pinMode(violetPin, OUTPUT);
pinMode(bluePin, OUTPUT);

//setup mode for buttons
pinMode(button, INPUT);

//initialize PINS/OUTPUT with a value 
digitalWrite(orangePin, LOW);
digitalWrite(violetPin, LOW);
digitalWrite(bluePin, LOW);

digitalWrite(button, LOW);

//begin Serial for tracking
Serial.begin(9600);
}

void loop() {

int buttonOn = digitalRead(button); 
if (buttonOn == HIGH)
{
Serial.println("Button has been pressed. Execute both for loops.");
float dc = 0.0;                   //float because it is a decimal number.
for ( dc = 0; dc <= 1; (dc=dc+0.25))

{
analogWrite (orangePin, maxDC*dc);
Serial.println("Star dim up orange LED.");

analogWrite (violetPin, maxDC*dc); 
Serial.println("Star dim up violet LED.");

analogWrite (bluePin, maxDC*dc); 
Serial.println("Star dim up blue LED.");
delay (250); 
}
for (dc = 1; dc >= 0; (dc=dc-0.25))
{
analogWrite (orangePin, maxDC*dc);
Serial.println("Star dim down orange LED.");

analogWrite (violetPin, maxDC*dc);
Serial.println("Star dim down violet LED.");

analogWrite (bluePin, maxDC*dc);
Serial.println("Star dim down blue LED.");
delay(250);
}

Serial.println("LEDs have been dimmed up and down once. Both loops ran through once.");
}

}