#define _CW 120
#define _CCW 180
#define DIR_PIN 2
#define STEP_PIN 3

uint8_t newByte = 0;
uint8_t lastByte = 0;
uint8_t checkByte = 0;
int16_t count = 0;
bool X10 = false;

void setup() {

  Serial.begin(115200);
  Serial.println("Click once on RE up or down");
  Serial.println("Then use page up/down to operate");
  pinMode(10, INPUT);
  pinMode(11, INPUT);
  pinMode(4, INPUT_PULLUP);
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);

}

void loop() {

  newByte = (digitalRead(11) << 1) | digitalRead(10);

  if (newByte != lastByte) {
    (checkByte <<= 2) += newByte;
    lastByte = newByte;
    newByte = 0;
  }
  if (checkByte == _CW) { //0b 01 11 10 00

    digitalWrite(DIR_PIN, HIGH);
    if (X10) {
      count += 10;
      for (int i = 0; i < 10; i++) {
        digitalWrite(STEP_PIN, HIGH);
        delayMicroseconds(1000);
        digitalWrite(STEP_PIN, LOW);
        delayMicroseconds(1000);
      }
      Serial.print(" CW ");
      Serial.println(count);
    } else {
      count ++;
      digitalWrite(STEP_PIN, HIGH);
      delayMicroseconds(1000);
      digitalWrite(STEP_PIN, LOW);
      Serial.print(" CW ");
      Serial.println(count);
    }
    checkByte = 0;
  }
  if (checkByte == _CCW) { //0b 10 11 01 00

    digitalWrite(DIR_PIN, LOW);
    if (X10) {
      count -= 10;
      for (int i = 0; i < 10; i++) {
        digitalWrite(STEP_PIN, HIGH);
        delayMicroseconds(1000);
        digitalWrite(STEP_PIN, LOW);
        delayMicroseconds(1000);
      }
      Serial.print("CCW ");
      Serial.println(count);
    } else {
      count --;
      digitalWrite(STEP_PIN, HIGH);
      delayMicroseconds(1000);
      digitalWrite(STEP_PIN, LOW);
      Serial.print("CCW ");
      Serial.println(count);

    }
    checkByte = 0;
  }
  if (digitalRead(4)) X10 = 1;
  else X10 = 0;
}