Arduino volume monitor

soundMeter.pde

int analogPin = 0;     // potentiometer wiper (middle terminal) connected to analog pin 3
                       // outside leads to ground and +5V

int writePin1 = 2;
int writePin2 = 3;
int writePin3 = 4;
int writePin4 = 5;
int writePin5 = 6;
int writePin6 = 7;
int val = 0;           // variable to store the value read

int threshold1 = 512;
int threshold2 = 500;
int threshold3 = 480;
int threshold4 = 460;
int threshold5 = 440;
int threshold6 = 420;

// 512 is the average for "silence"
// 511 is the average for "noise"

double thermister(int raw) {
 double temp;
 temp = log(((10240000/raw) - 10000));
 temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * temp * temp ))* temp );
 temp = temp - 273.15;            // Convert Kelvin to Celcius
 temp = (temp * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit
 return temp;
}


void setup() {
  Serial.begin(9600);          //  setup serial
}

void loop() {
  val = analogRead(analogPin);    // read the input pin
  if (val < threshold1) { digitalWrite(writePin1, HIGH); } else { digitalWrite(writePin1, LOW); }
  if (val < threshold2) { digitalWrite(writePin2, HIGH); } else { digitalWrite(writePin2, LOW); }
  if (val < threshold3) { digitalWrite(writePin3, HIGH); } else { digitalWrite(writePin3, LOW); }
  if (val < threshold4) { digitalWrite(writePin4, HIGH); } else { digitalWrite(writePin4, LOW); }
  if (val < threshold5) { digitalWrite(writePin5, HIGH); } else { digitalWrite(writePin5, LOW); }
  if (val < threshold6) { digitalWrite(writePin6, HIGH); } else { digitalWrite(writePin6, LOW); }
  Serial.println(val);             // debug value
}