Pro Micro RGB led loop

loop.ino

/* Pro Micro loop RGB led common cathode */

//int yellowPin = 10;
//int brightness = 8;
//int fadeAmount = 8;

int redPin = 3;
int greenPin = 5;
int bluePin = 6;

int redAmount = 8;
int greenAmount = 8;
int blueAmount = 8;

int redVal = 224;
int greenVal = 128;
int blueVal = 8;

void setup() {
//  pinMode(yellowPin, OUTPUT);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
//  analogWrite(yellowPin, brightness);

//  brightness = brightness + fadeAmount;
    
  analogWrite(redPin, redVal);
  analogWrite(greenPin, greenVal);
  analogWrite(bluePin, blueVal);

  redVal = redVal + redAmount;
  greenVal = greenVal + greenAmount;
  blueVal = blueVal + blueAmount;

//  if (brightness <= 8 || brightness >= 224) {
//    fadeAmount = -fadeAmount;
//  }

  if (redVal <= 8 || redVal >= 224) {
    redAmount = -redAmount;
  }
  if (greenVal <= 8 || greenVal >= 224) {
    greenAmount = -greenAmount;
  }
  if (blueVal <= 8 || blueVal >= 224) {
    blueAmount = -blueAmount;
  }

  delay(64);  // milliseconds
}