// PL pin 1
int load = 4;
// CE pin 15
int clockEnablePin = 5;
// Q7 pin 7
int dataIn = 2;
// CP pin 2
int clockIn = 3;
uint8_t newByte = 0;
uint8_t lastByte = 5;
int16_t count = 0;

void setup() {

  Serial.begin(115200);

  pinMode(load, OUTPUT);
  pinMode(clockEnablePin, OUTPUT);
  pinMode(clockIn, OUTPUT);
  pinMode(dataIn, INPUT);

}

void loop() {

  digitalWrite(load, LOW);
  delayMicroseconds(5);
  digitalWrite(load, HIGH);
  delayMicroseconds(5);

  for (int i = 0; i < 2; i++) {
    if (digitalRead(dataIn) == 1) {
      bitSet(newByte, i);
    }
    else {
      bitClear(newByte, i);
    }
    digitalWrite(clockIn, HIGH); // Shift out the next bit
    delayMicroseconds(10);
    digitalWrite(clockIn, LOW);
  }
  if (newByte != lastByte) {
    Serial.print(newByte);
    if (lastByte == 0) {
      if (newByte == 1) Serial.println(" CW");
      if (newByte == 2) Serial.println(" CCW");
    } else {Serial.println();}
    

    if (newByte == 0) {
      if (lastByte == 2) count ++;
      if (lastByte == 1) count --;
      Serial.print("c = ");
      Serial.println(count);
    }
    lastByte = newByte;
  }
  newByte = 0;

  delay(1);
}