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//define where your pins are
int clockPin = 7;
int latchPin = 8;
int dataPin = 9;
//Pin connected to 74HC595
int OclockPin = 10;
int OlatchPin = 11;
int OdataPin = 12;
byte buttonVar = 0;
byte buttonVarold = 1;
byte switchVar = 0;



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

  //define pin modes
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT); 
  pinMode(dataPin, INPUT);
  
  pinMode(OlatchPin, OUTPUT);
  pinMode(OclockPin, OUTPUT);
  pinMode(OdataPin, OUTPUT);

}

void loop() {

  //Pulse the latch pin:
  //set it to 1 to collect parallel data
  digitalWrite(latchPin,1);
  //set it to 1 to collect parallel data, wait
  delayMicroseconds(20);
  //set it to 0 to transmit data serially  
  digitalWrite(latchPin,0);
  //while the shift register is in serial mode
  //collect each shift register into a byte
  //the register attached to the chip comes in first 
  switchVar = shiftIn(dataPin, clockPin);
  //campionamento del valore corrispondente alla pressione del pulsante:
    if (switchVar != 0){
    buttonVar = switchVar;
    }
    
    if (buttonVar != buttonVarold){
    digitalWrite(OlatchPin, LOW);
    // shift out the bits:
    shiftOut(OdataPin, OclockPin, MSBFIRST, buttonVar);
    shiftOut(OdataPin, OclockPin, MSBFIRST, buttonVar);    
    //take the latch pin high so the LEDs will light up:
    digitalWrite(OlatchPin, HIGH);
    buttonVarold = buttonVar;
    }  
}

//------------------------------------------------end main loop

////// ----------------------------------------shiftIn function
///// just needs the location of the data pin and the clock pin
///// it returns a byte with each bit in the byte corresponding
///// to a pin on the shift register. leftBit 7 = Pin 7 / Bit 0= Pin 0

byte shiftIn(int myDataPin, int myClockPin) { 
  int i;
  int temp = 0;
  int pinState;
  byte myDataIn = 0;

  pinMode(myClockPin, OUTPUT);
  pinMode(myDataPin, INPUT);
//we will be holding the clock pin high 8 times (0,..,7) at the
//end of each time through the for loop

//at the begining of each loop when we set the clock low, it will
//be doing the necessary low to high drop to cause the shift
//register's DataPin to change state based on the value
//of the next bit in its serial information flow.
//The register transmits the information about the pins from pin 7 to pin 0
//so that is why our function counts down
  for (i=7; i>=0; i--)
  {
    digitalWrite(myClockPin, 0);
    delayMicroseconds(0.2);
    temp = digitalRead(myDataPin);
    if (temp) {
      pinState = 1;
      //set the bit to 0 no matter what
      myDataIn = myDataIn | (1 << i);
    }
    else {
      //turn it off -- only necessary for debuging
     //print statement since myDataIn starts as 0
      pinState = 0;
    }

    //Debuging print statements
    //Serial.print(pinState);
    //Serial.print("     ");
    //Serial.println (dataIn, BIN);

    digitalWrite(myClockPin, 1);

  }
  //debuging print statements whitespace
  //Serial.println();
  //Serial.println(myDataIn, BIN);
  return myDataIn;
}