caliper_digital_arduino

int bit_array[25];
unsigned long time_now;
int CLOCK_PIN = 5;
int DATA_PIN = 4;
void setup() {
  Serial.begin(9600);
  pinMode(CLOCK_PIN, INPUT);
  pinMode(DATA_PIN, INPUT);
  Serial.println("caliper ready");
}
void loop() {
  while (digitalRead(CLOCK_PIN) == LOW) {};
  time_now = micros();
  while (digitalRead(CLOCK_PIN) == HIGH) {};
  if ((micros() - time_now) > 500) {
    //decode();
  }
}

void decode() {
  int sign = 1;
  int i = 0;
  float value = 0.0;
  float result = 0.0;
  bit_array[i] = digitalRead(DATA_PIN);
  while (digitalRead(CLOCK_PIN) == HIGH) {};
  for (i = 1; i <= 24; i++) {
    while (digitalRead(CLOCK_PIN) == LOW) {};
    bit_array[i] = digitalRead(DATA_PIN);
    while (digitalRead(CLOCK_PIN) == HIGH) {};
  }
  for (i = 0 ; i <= 24; i++) {
    Serial.print(bit_array[i]); // print binary data output caliper
    Serial.print(" ");
  }
  Serial.println();
  for (i = 1; i <= 20; i++) {
    value = value + (pow(2, i - 1) * bit_array[i]);
  }
  if (bit_array[21] == 1)sign = -1;
  if (bit_array[24] == 1) {
    result = (value * sign) / 2000.00;
    Serial.print(result, 3);
    Serial.println("in");
  } else {
    result = (value * sign) / 100.00;
    Serial.print(result, 2); //Serial.print(result,2) --> untuk dua digit
    Serial.println("mm");
  } delay(500);
}