Stigern

int ledPin1 =  3;
int ledPin2 =  4;
int ledPin3 =  5;
int ledPin4 =  6;
int ledPin5 =  7;
int ledPin6 =  8;
int ledPin7 =  9;
int ledPin8 =  10;
int ledPin9 =  11;


void setup()
{
  Serial.begin(9600);
  // Define the led pins as outputs
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);
  pinMode(ledPin5, OUTPUT);
  pinMode(ledPin6, OUTPUT);
  pinMode(ledPin7, OUTPUT);
  pinMode(ledPin8, OUTPUT);
  pinMode(ledPin9, OUTPUT);
}

void loop()
{

  // Read data from serial communication
  if (Serial.available() > 0) {
    int b = Serial.read();

    // Note, I made it so that it's more sensitive to 0-40% load.
    // Since thats where it's usually at when using the computer as normal.
    if (b > 0 && b < 5)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, LOW);
      digitalWrite(ledPin3, LOW);
      digitalWrite(ledPin4, LOW);
      digitalWrite(ledPin5, LOW);
      digitalWrite(ledPin6, LOW);
      digitalWrite(ledPin7, LOW);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 5 && b < 10)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, LOW);
      digitalWrite(ledPin4, LOW);
      digitalWrite(ledPin5, LOW);
      digitalWrite(ledPin6, LOW);
      digitalWrite(ledPin7, LOW);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 10 && b < 15)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, LOW);
      digitalWrite(ledPin5, LOW);
      digitalWrite(ledPin6, LOW);
      digitalWrite(ledPin7, LOW);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 15 && b < 20)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, HIGH);
      digitalWrite(ledPin5, LOW);
      digitalWrite(ledPin6, LOW);
      digitalWrite(ledPin7, LOW);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 25 && b < 30)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, HIGH);
      digitalWrite(ledPin5, HIGH);
      digitalWrite(ledPin6, LOW);
      digitalWrite(ledPin7, LOW);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 35 && b < 40)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, HIGH);
      digitalWrite(ledPin5, HIGH);
      digitalWrite(ledPin6, HIGH);
      digitalWrite(ledPin7, LOW);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 40 && b < 60)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, HIGH);
      digitalWrite(ledPin5, HIGH);
      digitalWrite(ledPin6, HIGH);
      digitalWrite(ledPin7, HIGH);
      digitalWrite(ledPin8, LOW);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 60 && b < 80)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, HIGH);
      digitalWrite(ledPin5, HIGH);
      digitalWrite(ledPin6, HIGH);
      digitalWrite(ledPin7, HIGH);
      digitalWrite(ledPin8, HIGH);
      digitalWrite(ledPin9, LOW);
    }
    if (b > 80 && b < 100)
    {
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, HIGH);
      digitalWrite(ledPin3, HIGH);
      digitalWrite(ledPin4, HIGH);
      digitalWrite(ledPin5, HIGH);
      digitalWrite(ledPin6, HIGH);
      digitalWrite(ledPin7, HIGH);
      digitalWrite(ledPin8, HIGH);
      digitalWrite(ledPin9, HIGH);
    }
    Serial.flush();
  }
}