const int In1 = 7;
const int In2 = 6;
const int In3 = 5;
const int In4 = 4;
const int In5 = 3;
const int In6 = 2;
const int In7 = A2;
const int In8 = A3;
const int Ot1 = A4;
const int Ot2 = 9;
const int Ot3 = 10;
const int Ot4 = 11;
const int Ot5 = 12;
const int Ot6 = 13;
const int Ot7 = A1;
const int Ot8 = A0;
const int Inputs[]={In1,In2,In3,In4,In5,In6,In7,In8};
const int Outputs[]={Ot1,Ot2,Ot3,Ot4,Ot5,Ot6,Ot7,Ot8};

const unsigned long debounceTime = 10; //milliseconds
unsigned long switchPressTime[8][8]; //when switches last changed state

byte currentSwitchState[8][8];
byte oldSwitchState[8][8]={0};
byte actualState[8][8];


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);

pinMode(In1,OUTPUT);
pinMode(In2,OUTPUT);
pinMode(In3,OUTPUT);
pinMode(In4,OUTPUT);
pinMode(In5,OUTPUT);
pinMode(In6,OUTPUT);
pinMode(In7,OUTPUT);
pinMode(In8,OUTPUT);

pinMode(Ot1,INPUT);
pinMode(Ot2,INPUT);
pinMode(Ot3,INPUT);
pinMode(Ot4,INPUT);
pinMode(Ot5,INPUT);
pinMode(Ot6,INPUT);
pinMode(Ot7,INPUT);
pinMode(Ot8,INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
for(int i = 0; i < 8; i++){
  digitalWrite(Inputs[i],HIGH);
  
  for(int j = 0; j < 8; j++){
    currentSwitchState[i][j]= digitalRead(Outputs[j]);

    if( currentSwitchState[i][j] != oldSwitchState[i][j] )
      { if( millis() - switchPressTime[i][j] >= debounceTime){
        switchPressTime[i][j] = millis();
        oldSwitchState[i][j] = currentSwitchState[i][j];
      }
     }   
    }
  
  digitalWrite(Inputs[i],LOW);
  };
for(int i=0; i < 8; i++){
  for(int j=0; j < 8; j++){
    Serial.write(oldSwitchState[i][j]);
  }
};
Serial.print("STOP");