Footpad game controller

/*
 * By Eye4Tech.info
 * Released under Creative Common Zero License
 * This code reads 4 analog signals from Piezo Electric Crystal elements and convert the signal into pressed yes=no.
 * Although set as a game controler for future use we made a small running game in which steps made in a set time are counted
 * Debug set to 1 prints additional information to the serial monitor is used to write the programme
 * Logic set to 1 gives the values of four sensors
 * Game  set to 1 counts the steps in a set time.
 */

// Treshold levels with higher up and lower down treshold "schmitt-trigger" approach
#define ThresholdUp  500           // value becomes high if reading becommes equal or higher than this value
#define ThresholdLow  50           // value becomes low  if reading becommes lower than this value

// Code inclusion excludion settings
#define Debug          0           // to test the code
#define Logic          0           // to have the logic printed out, best when not the running game counter
#define Game           1           // running game

// constant values 
const uint8_t PIEZO_0  =    A0;    // piezo output left
const uint8_t PIEZO_1  =    A1;    // piezo output back
const uint8_t PIEZO_2  =    A2;    // piezo output right
const uint8_t PIEZO_3  =    A3;    // piezo output front
bool Reading[4]    = {0,0,0,0};
bool OldReading[4] = {0,0,0,0};
bool change        =         0;
uint16_t EndTime   =         0;    // time to end of exercise
uint16_t ExerTime  =         0;    // duration of exercise in microseconds
int  StepCounter   =         0;

void setup() 
{
  Serial.begin(9600);
  // When game is set above this will ask for the time the person wants to race
  #if Game
    { 
      Serial.print  ("Give a one digit number of minutes you want to exercise: ");
      while (!ExerTime)
      {
        if (Serial.available() > 0)
        {
          char Minutes = Serial.read();
          if (isDigit(Minutes))
          { 
            Serial.print  (Minutes);
            ExerTime = 60000*(int(Minutes )-48);    // 1 is ASCII 49
            Serial.print  ("\nYour chosen exercise time is ");
            Serial.print  ( Minutes        );
            Serial.print  (" minutes or "  );
            Serial.print  ( ExerTime       );
            Serial.println(" microseconds.");
            Serial.println("We are ready to record your race ;-)");
          }
        }
      }
    }
  #endif
}

void loop() 
{
  // read Piezo ADC values
  int piezoADC0 = analogRead(PIEZO_0);
  int piezoADC1 = analogRead(PIEZO_1);
  int piezoADC2 = analogRead(PIEZO_2);
  int piezoADC3 = analogRead(PIEZO_3);
  
  // Use a schmitt trigger approach with higher up and lower down treshold to set yes no values.
  if (piezoADC0 >= ThresholdUp  & !Reading[0]) Reading[0] =1;
  if (piezoADC0 <  ThresholdLow &  Reading[0]) Reading[0] =0;
  if (piezoADC1 >= ThresholdUp  & !Reading[1]) Reading[1] =1;
  if (piezoADC1 <  ThresholdLow &  Reading[1]) Reading[1] =0;
  if (piezoADC2 >= ThresholdUp  & !Reading[2]) Reading[2] =1;
  if (piezoADC2 <  ThresholdLow &  Reading[2]) Reading[2] =0;
  if (piezoADC3 >= ThresholdUp  & !Reading[3]) Reading[3] =1;
  if (piezoADC3 <  ThresholdLow &  Reading[3]) Reading[3] =0;


  // verify if the reading changed the array values
  if (Logic)
  {
    change = 0;                      // assume no change at the start
    for (int i=0; i < 4; i++)
    {
      if (Reading[i] != OldReading[i])
      {
        change = 1;                  // indicate a change in values
        #if Debug
        {
          Serial.println("The values have been changed");
        }
        #endif
        break;                       // if one value is changed no other check is required
      }
    }
   
  }
  
  // if the value changed and Logic is on print the logic values
  if (change && Logic) 
  {
    Serial.print  (Reading[0]    );
    Serial.print  (",  "         );
    Serial.print  (Reading[1]    );
    Serial.print  (",  "         );
    Serial.print  (Reading[2]    );
    Serial.print  (",  "         );
    Serial.print  (Reading[3]    );
    Serial.print  (", || "       );
    Serial.print  (OldReading[0] );
    Serial.print  (",  "         );
    Serial.print  (OldReading[1] );
    Serial.print  (",  "         );
    Serial.print  (OldReading[2] );
    Serial.print  (",  "         );
    Serial.print  (OldReading[3] );
    Serial.println(""            );
    memcpy(OldReading, Reading, 4);
  }
  if (!change && Debug)
  {
    Serial.println("The values have been NOT been changed");
  }

  // step counter as a simple application for the pad
  if (Game)
  {
    // determine the start of the execise on the left foot when no step was set yet
    if (!EndTime && !StepCounter && Reading[0])
    {
      EndTime = millis() + ExerTime;
      Serial.print  ("Start running!\n");
      /*
      Serial.print  ("Now = "  );
      Serial.print  (millis()  );
      Serial.print  ("\tEnd = ");
      Serial.println(EndTime   );
      */
      OldReading[0]=1;
    }

    // as long as the end time of the exercise is not reached count steps
    // one step is a press left, press right. Counter count on the right step. 
    if (millis() < ExerTime)
    {
      if( OldReading[0] && !Reading[0] && Reading[2] )
      {
        /*
         * L[0] | R[2] | OL[0] | OR[2]
         * 0    | 0    | 0     | 0
         * 1    | 0    | 1     | 0     Conditions         => Set values
         * 0    | 1    | 0     | 1     OL_1 && L_0 && R_1 => OL_0 & OR_1
         * 1    | 0    |               OR_1 && L_1 && R_0 => OL_1 & OR_0
         */
        OldReading[0]= 0 ;
        OldReading[2]= 1 ;
        StepCounter += 1 ;
        Serial.println(StepCounter);
        
      }
      if( OldReading[2] && Reading[0] && !Reading[2] )
      {
        OldReading[0]= 1 ;
        OldReading[2]= 0 ;
      }
    }
    else
    {
      Serial.println("\nYou did it !"    ) ;
      Serial.print  ("You have done "    ) ;
      Serial.print  ( StepCounter        ) ;
      Serial.println(" steps. Well done!") ;
      Serial.print  ("You had around "   ) ;
      Serial.print  (StepCounter/(ExerTime/60000));
      Serial.println(" steps per minute!"          ) ;
      
      while (true)
      {
        // do nothing in a continious look to stop the program
      } 
    }
  }
}