EMF detector

This project was originally performed by Collin Cunningham (MAKE). GO to the website below for more details:
http://makezine.com/2009/05/15/making-the-arduino-emf-detector/

Components Required:
(1) LED BAR (You can also use LEDs instead)
(2) 10 resistors (220 - 330 ohm)
(3) ONE 3.3M ohm resistor (Or, use multiple resister to make them equivalent to 3.3M ohm)
(4) Wires!
(5) Probe (basically, a wire)

SCHEMATIC:

Here, I just used an Android Nano instead of Arduino Uno. And, also used three- 1M resistors and one- 220 ohm resistor instead of using one- 3.3M resistor. (You can use what ever you want!)

CODE: (by Collin Cunningham)

// 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

#define NUMREADINGS 15 

void setup();
void loop();
int senseLimit = 15; 
int probePin = 5; 
int val = 0;

int LED1 = 11;  
int LED2 = 10;  
int LED3 = 9;   
int LED4 = 8;   
int LED5 = 7;  
int LED6 = 6; 
int LED7 = 5;  
int LED8 = 4;  
int LED9 = 3;   
int LED10 = 2;  

int readings[NUMREADINGS];               
int index = 0;                           
int total = 0;                            
int average = 0;                         

void setup() {

  pinMode(2, OUTPUT);  
  pinMode(3, OUTPUT);
  pinMode(8, OUTPUT); 
  pinMode(9, OUTPUT); 
  pinMode(10, OUTPUT); 
  pinMode(11, OUTPUT); 

  Serial.begin(9600);  

  for (int i = 0; i < NUMREADINGS; i++)
    readings[i] = 0;                     
}

void loop() {

  val = analogRead(probePin); 

  if(val >= 1){               

    val = constrain(val, 1, senseLimit); 
    val = map(val, 1, senseLimit, 1, 1023); 

    total -= readings[index];              
    readings[index] = val; 
    total += readings[index];               
    index = (index + 1);                   

    if (index >= NUMREADINGS)              
      index = 0;                           

    average = total / NUMREADINGS;         

    if (average > 50){                
      digitalWrite(LED1, HIGH);   
    }
    else{                         
      digitalWrite(LED1, LOW);    
    }

    if (average > 150){            
      digitalWrite(LED2, HIGH);
    }
    else{
      digitalWrite(LED2, LOW);
    }

    if (average > 250){
      digitalWrite(LED3, HIGH);
    }
    else{
      digitalWrite(LED3, LOW);
    }

    if (average > 350){
      digitalWrite(LED4, HIGH);
    }
    else{
      digitalWrite(LED4, LOW);
    }

    if (average > 450){
      digitalWrite(LED5, HIGH);
    }
    else{
      digitalWrite(LED5, LOW);
    }

    if (average > 550){
      digitalWrite(LED6, HIGH);
    }
    else{
      digitalWrite(LED6, LOW);
    }

    if (average > 650){
      digitalWrite(LED7, HIGH);
    }
    else{
      digitalWrite(LED7, LOW);
    }

    if (average > 750){
      digitalWrite(LED8, HIGH);
    }
    else{
      digitalWrite(LED8, LOW);
    }

    if (average > 850){
      digitalWrite(LED9, HIGH);
    }
    else{
      digitalWrite(LED9, LOW);
    }

    if (average > 950){
      digitalWrite(LED10, HIGH);
    }
    else{
      digitalWrite(LED10, LOW);
    }

    Serial.println(val); 
  }
}

int main(void)
{
init();
setup();
for (;;)
loop();
return 0;
}