74HC165AP

配線

https://rephtone.com/electronics/arduino-74hc165/ 参照
CLK INH : GND
SER : GND
QH : 4
SH/LD : 2
CLK : 3

プログラム

/*
 * 74HC165
 * SH/LD 2
 * CLK 3
 * QH 4
 */

int const SL = 2;
int const CLK = 3;
int const SER = 4;

int array[8] = {0,0,0,0,0,0,0,0,};

void setup() {
  pinMode(CLK, OUTPUT);
  pinMode(SL, OUTPUT);
  pinMode(SER, INPUT);

  digitalWrite(SL, HIGH);
  digitalWrite(CLK, LOW);

  Serial.begin(9600);
}

void loop() {
  digitalWrite(SL, LOW);
  digitalWrite(SL, HIGH);
  for (int i=0; i<8; i++){
    array[i] = (digitalRead(SER));
    digitalWrite(CLK, HIGH);
    digitalWrite(CLK, LOW);
  }
  for (int i=0; i<8; i++){
    if (array[i] == 0){
      Serial.print("0, ");
    }
    if (array[i] == 1){
      Serial.print("1, ");
    }
  }
  Serial.println();
  
}