// 74HC595
const int dataPin595 = 11; // DS
const int clockPin595 = 12; // SHCP
const int latchPin595 = 13; // STCP

// 74HC165
const int dataPin165 = 8; // Q7
const int clockPin165 = 9; // CP
const int latchPin165 = 10; // PL

const byte dataArray[8] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};

void setup() {
  // 74HC595
  pinMode(dataPin595, OUTPUT); 
  pinMode(clockPin595, OUTPUT); 
  pinMode(latchPin595, OUTPUT); 

  // 74HC165
  pinMode(dataPin165, INPUT); 
  pinMode(clockPin165, OUTPUT);
  pinMode(latchPin165, OUTPUT);

  Serial.begin(9600);
}

void loop() {

  // Cycle through columns and enable them one by one
  for ( int i = 0; i < 8; i++) {
    digitalWrite(latchPin595, LOW);
    shiftOut(dataPin595, clockPin595, LSBFIRST, dataArray[i]);
    digitalWrite(latchPin595, HIGH);

    // Cycle through the rows and sample
    digitalWrite(latchPin165, LOW);
    digitalWrite(latchPin165, HIGH);

/*
    for (int j = 0; j < 8; j++) {
      int bit = digitalRead(dataPin165);
      if (bit == HIGH) {
        Serial.print("column: ");
        Serial.print(i+1);
        Serial.print(" row: ");
        Serial.print(j+1);
        Serial.println();
      } 
      digitalWrite(clockPin165, HIGH); // Shift out the next bit
      digitalWrite(clockPin165, LOW);
    }
    */

      // Step 2: Shift
  Serial.print("Bits: ");
  for (int i = 0; i < 8; i++) {
    int bit = digitalRead(dataPin165);
    if (bit == HIGH) {
      Serial.print("1");
    } else {
      Serial.print("0");
    }
    digitalWrite(clockPin165, HIGH); // Shift out the next bit
    digitalWrite(clockPin165, LOW);
  }
    Serial.println();

    delay(500);
  }

}