// EMF Detector for LED Bargraph v1.0
// 5.12.2009
// original code/project by Aaron ALAI - aaronalai1@gmail.com
// modified for use w/ LED bargraph by Collin Cunningham - collin@makezine.com
// modified by Mirko Pavleski: Dot Led mode + Sound

#define NUMREADINGS 25 // raise this number to increase data smoothing

int senseLimit = 2; // raise this number to decrease sensitivity (up to 1023 max)
int probePin = 5; // analog 5
int val = 0; // reading from probePin

int LED1 = 12;  // connections
int LED2 = 10;  // to
int LED3 = 9;   // LED
int LED4 = 8;   // bargraph
int LED5 = 7;   // anodes
int LED6 = 6;   // with
int LED7 = 5;   // resistors
int LED8 = 4;   // in
int LED9 = 3;   // series
int LED10 = 2;  // 

// variables for smoothing

int readings[NUMREADINGS];                // the readings from the analog input
int index = 0;                            // the index of the current reading
int total = 0;                            // the running total
int average = 0;                          // final average of the probe reading

void setup() {

  pinMode(2, OUTPUT);  // specify LED bargraph outputs
  pinMode(3, OUTPUT); 
  pinMode(4, OUTPUT); 
  pinMode(5, OUTPUT); 
  pinMode(6, OUTPUT); 
  pinMode(7, OUTPUT); 
  pinMode(8, OUTPUT); 
  pinMode(9, OUTPUT); 
  pinMode(10, OUTPUT); 
  pinMode(12, OUTPUT); 

  Serial.begin(9600);  // initiate serial connection for debugging/etc

  for (int i = 0; i < NUMREADINGS; i++)
    readings[i] = 0;                      // initialize all the readings to 0
}

void loop() {

  val = analogRead(probePin);  // take a reading from the probe

  if(val >= 1){                // if the reading isn't zero, proceed

    val = constrain(val, 1, senseLimit);  // turn any reading higher than the senseLimit value into the senseLimit value
    val = map(val, 1, senseLimit, 1, 1023);  // remap the constrained value within a 1 to 1023 range

    total -= readings[index];               // subtract the last reading
    readings[index] = val; // read from the sensor
    total += readings[index];               // add the reading to the total
    index = (index + 1);                    // advance to the next index

    if (index >= NUMREADINGS)               // if we're at the end of the array...
      index = 0;                            // ...wrap around to the beginning

    average = total / NUMREADINGS;          // calculate the average

        int thisPitch = map (average, 50, 950, 100, 1500);
       tone(11, thisPitch,120);
       
    if (average > 50 && average < 150){                // if the average is over 50 ...
      digitalWrite(LED1, HIGH);   // light the first LED
     
    }
    else{                         // and if it's not ...
      digitalWrite(LED1, LOW);// turn that LED off
     
    }

    if (average >= 150 && average < 250){               // and so on ...
      digitalWrite(LED2, HIGH);      
    }
    else{
      digitalWrite(LED2, LOW);    
    }

    if (average >= 250 && average < 350){
      digitalWrite(LED3, HIGH);
    }
      
    else{
      digitalWrite(LED3, LOW);
     
    }

    if (average >= 350 && average < 450){
      digitalWrite(LED4, HIGH);
    
    }
    else{
      digitalWrite(LED4, LOW);
    
    }

    if (average >= 450 && average < 550){
      digitalWrite(LED5, HIGH);
      
    }
    else{
      digitalWrite(LED5, LOW);
    
    }

    if (average >= 550 && average < 650 ){
      digitalWrite(LED6, HIGH);
      
    }
    else{
      digitalWrite(LED6, LOW);
   
    }

    if (average >= 650 &&average < 750){
      digitalWrite(LED7, HIGH);
     
    }
    else{
      digitalWrite(LED7, LOW);
    
    }

    if (average >= 750 && average <850){
      digitalWrite(LED8, HIGH);
     
    }
    else{
      digitalWrite(LED8, LOW);
   
    }

    if (average >= 825 && average <900){
      digitalWrite(LED9, HIGH);
    }
     
    else{
      digitalWrite(LED9, LOW);
   
    }

    if (average > 900){
      digitalWrite(LED10, HIGH);
      
    }
    else{
      digitalWrite(LED10, LOW);
   
    }

    Serial.println(val); // use output to aid in calibrating
  }
}