void setup(){
  Serial.begin(9600);
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,INPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
}

void loop(){
  digitalWrite(2,!digitalRead(2));
  digitalWrite(8,LOW);
  digitalWrite(9,HIGH);
  digitalWrite(10,HIGH);
  Serial.print("000:");
  Serial.print(readpins(0000));
  Serial.print(",");
  Serial.print(readpins(0001));
  Serial.print(",");
  Serial.print(readpins(0010));
  Serial.print(",");
  Serial.print(readpins(0011));
  Serial.print(",");
  Serial.print(readpins(0100));
  Serial.print(",");
  Serial.print(readpins(0101));
  Serial.print(",");
  Serial.print(readpins(0110));
  Serial.print(",");
  Serial.print(readpins(0111));
  Serial.print(",");
  Serial.print(readpins(1000));
  Serial.print(",");
  Serial.print(readpins(1001));
  Serial.print(",");
  Serial.print(readpins(1010));
  Serial.print(",");
  Serial.print(readpins(1011));
  Serial.print(",");
  Serial.print(readpins(1100));
  Serial.print(",");
  Serial.print(readpins(1101));
  Serial.print(",");
  Serial.print(readpins(1110));
  Serial.print(",");
  Serial.print(readpins(1111));
  digitalWrite(8,HIGH);
  digitalWrite(9,LOW);
  digitalWrite(10,HIGH);
  Serial.print(",");
  Serial.print(readpins(0000));
  Serial.print(",");
  Serial.print(readpins(0001));
  Serial.print(",");
  Serial.print(readpins(0010));
  Serial.print(",");
  Serial.print(readpins(0011));
  Serial.print(",");
  Serial.print(readpins(0100));
  Serial.print(",");
  Serial.print(readpins(0101));
  Serial.print(",");
  Serial.print(readpins(0110));
  Serial.print(",");
  Serial.print(readpins(0111));
  Serial.print(",");
  Serial.print(readpins(1000));
  Serial.print(",");
  Serial.print(readpins(1001));
  Serial.print(",");
  Serial.print(readpins(1010));
  Serial.print(",");
  Serial.print(readpins(1011));
  Serial.print(",");
  Serial.print(readpins(1100));
  Serial.print(",");
  Serial.print(readpins(1101));
  Serial.print(",");
  Serial.print(readpins(1110));
  Serial.print(",");
  Serial.print(readpins(1111));
  digitalWrite(8,HIGH);
  digitalWrite(9,HIGH);
  digitalWrite(10,LOW);
  Serial.print(",");
  Serial.print(readpins(0000));
  Serial.print(",");
  Serial.print(readpins(0001));
  Serial.print(",");
  Serial.print(readpins(0010));
  Serial.print(",");
  Serial.print(readpins(0011));
  Serial.print(",");
  Serial.print(readpins(0100));
  Serial.print(",");
  Serial.print(readpins(0101));
  Serial.print(",");
  Serial.print(readpins(0110));
  Serial.print(",");
  Serial.print(readpins(0111));
  Serial.print(",");
  Serial.print(readpins(1000));
  Serial.print(",");
  Serial.print(readpins(1001));
  Serial.print(",");
  Serial.print(readpins(1010));
  Serial.print(",");
  Serial.print(readpins(1011));
  Serial.print(",");
  Serial.print(readpins(1100));
  Serial.print(",");
  Serial.print(readpins(1101));
  Serial.print(",");
  Serial.print(readpins(1110));
  Serial.print(",");
  Serial.print(readpins(1111));
  Serial.println("");
}

bool readpins(int id){
  int num4 = (id / 1) % 10;
  int num3 = (id / 10) % 10;
  int num2 = (id / 100) % 10;
  int num1 = (id / 1000) % 10;
  digitalWrite(3,num1);
  digitalWrite(4,num2);
  digitalWrite(5,num3);
  digitalWrite(6,num4);
  return digitalRead(7);
}