안녕하세요.
 
74HC165 3개를 이용하여 단선 체크를 하려고 합니다.
출력 데이터는 시리얼모니터에는 나오는데
LCD 출력 시 8개만 인식하고 16개는 인식을 못합니다.
LCD 출력에 
  byte incoming = shiftIn(data, clock, MSBFIRST); 
이것이 문제인 것 같은데, 어떻게 변경하면 좋을까요?
 
#include <ShiftIn.h>
// Init ShiftIn instance with one chip.
// The number in brackets defines the number of daisy-chained 74HC165 chips
// So if you are using two chips, you would write: ShiftIn<2> shift;
ShiftIn<3> shift;
 
#include <LiquidCrystal_I2C.h>
 
LiquidCrystal_I2C lcd(0x27, 20, 4);
 
 
#define enable 9 //15p
#define load 8   //1p
#define clock 12  //2p 
#define data 11   //9p 
 
 
void setup() {
 
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("HRS TEST KIT");
  lcd.setCursor(0, 1);
  lcd.print("Disconnect check");
  delay(5000);
  lcd.clear();
 
 
  pinMode(enable, OUTPUT);
  pinMode(load, OUTPUT);
  pinMode(clock, OUTPUT);
  pinMode(data, INPUT);
  digitalWrite(load, HIGH);
  digitalWrite(enable, HIGH);
 
 
  Serial.begin(9600);
  // declare pins: pLoadPin, clockEnablePin, dataPin, clockPin
  shift.begin(8, 9, 11, 12);
}
 
void displayValues() {
 
    for (int i = 0; i < shift.getDataWidth(); i++)
 
    
  Serial.print( shift.state(i) ); // get state of button i
  Serial.println();
 
}
 
 
 
 
 
void loop() {
  if (shift.update()) // read in all values. returns true if any button has changed
    displayValues();
 
 
digitalWrite(load, LOW);
  delayMicroseconds(5);
  digitalWrite(load, HIGH);
  delayMicroseconds(5);
 
  digitalWrite(clock, HIGH);
  digitalWrite(enable, LOW);
  byte incoming = shiftIn(data, clock, MSBFIRST);
  digitalWrite(enable, HIGH);
 
 
 for (int i = 23; i >= 0; i--)
  {
    if (bitRead(incoming, i) == 1)
    {
      lcd.setCursor(i, 0);
      lcd.print("O");
    }
    else
    {
      lcd.setCursor(i, 0);
      lcd.print("X");
    }
  }
 
 
    
  delay(50);
}