// 74HC165 Input Shift Register
// PL pin
int load = 27;
// Q7 pin
int dataIn = 25;
// CP pin
int clockIn = 26;

// 74HC595 Output Shift Register
// DS pin
int dataOut = 15;
// STCP pin
int stcp = 4;
// SHCP pin
int shcp = 5;

const int8_t dec_digits[10] = {129,79,146,6,204,36,160,15,128,4};
uint8_t my_count = 0; 

void setup()
{
 
  // Setup Serial Monitor
  Serial.begin(115200);
 
  // Setup 74HC165 connections
  pinMode(load, OUTPUT);
  pinMode(clockIn, OUTPUT);
  pinMode(dataIn, INPUT);
  pinMode(stcp, OUTPUT);
  pinMode(shcp, OUTPUT);
  pinMode(dataOut, OUTPUT);
}
 
void loop()
{
 
  // Write pulse to load pin
  digitalWrite(load, LOW);
  delayMicroseconds(5);
  digitalWrite(load, HIGH);
  delayMicroseconds(5);
 
  // Get data from 74HC165
  digitalWrite(clockIn, HIGH);
  byte bitstate = shiftIn(dataIn, clockIn, LSBFIRST);
 
  // Print to serial monitor
  Serial.print("Pin States: ");
  Serial.println(bitstate, BIN);

  digitalWrite(stcp,LOW);
  shiftOut(dataOut, shcp, LSBFIRST, dec_digits[my_count]);
  digitalWrite(stcp, HIGH);
  my_count++;
  if (my_count > 9) my_count = 0;  

  delay(1000);
}