int red = 9;
int blue = 7;
int green = 8;

String rH;
String gH;
String bH;

int rV;
int gV;
int bV;

long counter;
String COLOUR = "#0000e0";

void setup() {
  // put your setup code here, to run once:
  counter = 0;
  pinMode(red,OUTPUT);
  pinMode(green,OUTPUT);
  pinMode(blue,OUTPUT);

  rH = COLOUR.charAt(1);
  rH.concat(COLOUR.charAt(2));
  gH = COLOUR.charAt(3);
  gH.concat(COLOUR.charAt(4));
  bH = COLOUR.charAt(5);
  bH.concat(COLOUR.charAt(6));

  //base is 16, as long as input is fine, this should work
  rV = strtoul(rH.c_str(),NULL,16);
  gV = strtoul(gH.c_str(),NULL,16);
  bV = strtoul(bH.c_str(),NULL,16);
  
  Serial.begin(9600);
  Serial.println(rV);
  Serial.println(gV);
  Serial.println(bV);
}

void loop() {
  // put your main code here, to run repeatedly:
  // modulus will reach 0 at counter = 256
  int temp = counter % 256;
  // any above 0 value of rV will get red led to glow
  // or any value that is less than the counter
  if (temp < rV) {
    digitalWrite(red,HIGH);
  } else {
    digitalWrite(red,LOW);
  }
  if (temp < gV) {
    digitalWrite(green,HIGH);
  } else {
    digitalWrite(green,LOW);
  }
  if (temp < bV) {
    digitalWrite(blue,HIGH);
  } else {
    digitalWrite(blue,LOW);
  }

  counter += 1;
  delayMicroseconds(10);
}