// Author:  Nien Lam
// Date:    09-24-2009
// Title:   Double Sensors, Double LED Arrays 
// Descr:   2 sensors (aka variable resistors), are used to turn on corresponding arrays of LEDs.
//          Greater force/pressure applied to the sensors will cause more LEDs in the array to turn on.  
           

// Analog input pins variable resistors 1 and 2
int r1Pin = 0;   
int r2Pin = 1;   

// Analog values from variable resistors 1 and 2
int r1Val = 0;   
int r2Val = 0;   

// Min/Max values for resistors, ranges may be flipped based on resistor type
int r1ValMin = 0;
int r1ValMax = 600;
int r2ValMin = 100;
int r2ValMax = 40;

// LED arrays associated with variable reisistor 1 and 2
int r1LedArr[] = {11, 10, 9, 8};
int r2LedArr[] = {7, 6, 5, 4};

// Size of LED arrays
int r1LedArrSize = sizeof(r1LedArr)/sizeof(int); 
int r2LedArrSize = sizeof(r2LedArr)/sizeof(int);


void setup() {
  // Initialize serial communications at 9600 bps
  Serial.begin(9600); 

  // Declare the led pin as outputs
  for (int ii=0; ii < r1LedArrSize; ii++)
    pinMode(r1LedArr[ii], OUTPUT);

  for (int ii=0; ii < r2LedArrSize; ii++)
    pinMode(r2LedArr[ii], OUTPUT);
}



void loop() {
  // Reset LED arrays to LOW
  for (int ii=0; ii < r1LedArrSize; ii++)
    digitalWrite(r1LedArr[ii], LOW);  

  for (int ii=0; ii < r2LedArrSize; ii++)
    digitalWrite(r2LedArr[ii], LOW);  


  // Turn on LED array 1 based on forced applied to resistors 
  r1Val = analogRead(r1Pin); 
  int r1Force = map(r1Val, r1ValMin, r1ValMax, 0, 4);

  for (int ii=0; ii < r1LedArrSize; ii++) {
    if (r1Force > ii) 
      digitalWrite(r1LedArr[ii], HIGH);
  }


  // Turn on LED array 1 based on forced applied to resistors 
  r2Val = analogRead(r2Pin); 
  int r2Force = map(r2Val, r2ValMin, r2ValMax, 0, 4);

  for (int ii=0; ii < r2LedArrSize; ii++) {
    if (r2Force > ii) 
      digitalWrite(r2LedArr[ii], HIGH);
  }


  //Serial.println(r1Val);      
  //Serial.println(r2Val);      

  // Add a delay
  delay(200);                    
}