constexpr uint8_t S0 = 4;
constexpr uint8_t S1 = 5;
constexpr uint8_t CP = 6;
constexpr uint8_t Q0 = 7;
constexpr uint8_t Q7 = 8;
constexpr uint8_t DS0 = 9;
constexpr uint8_t DS7 = 10;
constexpr uint8_t OE1 = 12;
constexpr uint8_t OE2 = 11;

void setup() {
  Serial.begin(9600);
  pinMode(Q0, INPUT);
  pinMode(Q7, INPUT);
  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(CP, OUTPUT);
  pinMode(OE1, OUTPUT);
  pinMode(OE2, OUTPUT);
  pinMode(DS0, OUTPUT);
  pinMode(DS7, OUTPUT);
}

void parallelLoad() {
  digitalWrite(OE1, HIGH);
  digitalWrite(OE2, HIGH);
  digitalWrite(S0, HIGH);
  digitalWrite(S1, HIGH);
  digitalWrite(CP, HIGH);
  digitalWrite(CP, LOW);
}

void leftShift() {
  digitalWrite(OE1, HIGH);
  digitalWrite(OE2, HIGH);
  digitalWrite(S0, LOW);
  digitalWrite(S1, HIGH);
  Serial.print("Left shift parallel: ");
  Serial.println(shiftIn(Q0, CP, LSBFIRST));
  digitalWrite(OE1, LOW);
  digitalWrite(OE2, LOW);
  Serial.println("Blink sequence...");
  for (int i = 0; i < 3; ++i) {
    shiftOut(DS7, CP, LSBFIRST, 255);
    Serial.print("Left shift serial: ");
    Serial.println(shiftIn(Q0, CP, LSBFIRST));
    delay(500);
    shiftOut(DS7, CP, LSBFIRST, 0);
    Serial.print("Left shift serial: ");
    Serial.println(shiftIn(Q0, CP, LSBFIRST));
  }
  Serial.println("Done.");
}

void rightShift() {
  digitalWrite(OE1, HIGH);
  digitalWrite(OE2, HIGH);
  digitalWrite(S0, HIGH);
  digitalWrite(S1, LOW);
  Serial.print("Right shift parallel: ");
  Serial.println(shiftIn(Q7, CP, MSBFIRST));
  digitalWrite(OE1, LOW);
  digitalWrite(OE2, LOW);
  Serial.println("Blink sequence...");
  for (int i = 0; i < 3; ++i) {
    shiftOut(DS0, CP, MSBFIRST, 255);
    Serial.print("Right shift serial: ");
    Serial.println(shiftIn(Q7, CP, MSBFIRST));
    delay(500);
    shiftOut(DS0, CP, MSBFIRST, 0);
    Serial.print("Right shift serial: ");
    Serial.println(shiftIn(Q7, CP, MSBFIRST));
    delay(500);
  }
  Serial.println("Done.");
}

void loop() {
  parallelLoad();
  delay(3000);
  leftShift();
  delay(3000);
  parallelLoad();
  delay(3000);
  rightShift();
  delay(3000);
}