namespace PISO // 74HC165
{
    const uint8_t latchPin = 25;  // SH/!LD
    const uint8_t clkInhPin = 33; // CLK INH
    const uint8_t clockPin = 26;  // CLK
    const uint8_t dataPin = 27;   // QH, Q7
}

const uint8_t registers = 2;
uint8_t input[registers];

void setup() {
  Serial.begin(115200);

  pinMode(PISO::latchPin, OUTPUT);
  pinMode(PISO::clkInhPin, OUTPUT);
  pinMode(PISO::clockPin, OUTPUT);
  pinMode(PISO::dataPin, INPUT);
}

void loop() {
  // Reading data using 74HC165
  digitalWrite(PISO::latchPin, LOW);
    delayMicroseconds(5);
    digitalWrite(PISO::latchPin, HIGH);
    delayMicroseconds(5);

    digitalWrite(PISO::clkInhPin, LOW);
    for (uint8_t i = 0; i < registers; i++)
    {
        input[i] = shiftIn(PISO::dataPin, PISO::clockPin, MSBFIRST);

        for (uint8_t j = 0; j < 8; j++)
        {
            Serial.print(!!(input[i] & (1 << j)));
            Serial.print(" ");
        }
        Serial.print("   ");
    }
    digitalWrite(PISO::clkInhPin, HIGH);

    Serial.println();
  
  delay(100);
}