/*
  74HC165 Shift register input example
  (C) 2025, Kshyhoo
  const int loadPin = 4; // PL – Parallel load (aktywny LOW)
  const int dataPin = 5;   // Q7
  const int clockPin = 2;  // CP
  const int latchPin = 4;  // PL
  165 dla 8
*/
const int clockPin = 2; // CP
const int latchPin = 3; // /PL (aktywny LOW)
const int dataPin  = 4; // Q7

byte PISOdata = 4; // input from PiSo
byte PISOlatch = 3; // latch for PiSo, LOW=load
byte PISOclk = 2;  // PiSo clock
byte PISOreceivedData;

void setup() {
  pinMode(PISOdata, INPUT);
  pinMode(PISOlatch, OUTPUT);
  pinMode(PISOclk, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // load register
  digitalWrite(PISOlatch, LOW);
  // register at high, to allow reading
  digitalWrite(PISOlatch, HIGH);
  // here's the extra reading you suggested
  Serial.print(digitalRead(PISOdata));
  // also changed this from i<8 to i<7 since there was excess 0 at data
  for (byte i = 0; i < 7; i++) {
    digitalWrite(PISOclk, LOW);
    digitalWrite(PISOclk, HIGH);
    Serial.print(digitalRead(PISOdata));
  }
  Serial.println();
}