// Pins connected to 74HC165
const int loadPin = 8;
const int clockPin = 12;
const int dataPin = 11;

void setup() {
  Serial.begin(9600);
  pinMode(loadPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, INPUT);
}

void loop() {
  digitalWrite(loadPin, LOW); // load parallel data
  delayMicroseconds(5);
  digitalWrite(loadPin, HIGH); // start shifting in serial data
  delayMicroseconds(5);

  byte inputs = shiftIn(dataPin, clockPin, MSBFIRST); // read 8 inputs

  for (int i = 0; i < 8; i++) {
    Serial.println(bitRead(inputs, i)); // print state of each input
  }
  delay(1000);
}