Stepper DS18B20 V2

/*
 * Stepper DS18B20 V2
 */

#include <OneWire.h>

int DS18S20_Pin = 12; // DS18S20 on digital 12

// Temperature chip i/o
OneWire ds(DS18S20_Pin); // on digital pin 12

// Variables
float temperature = 25.0; //sensor updates this

int substeps = 16;

int    stepperApinDir  = 7;
int    stepperApinStep = 4;
double stepperAcurrPosition = 0;
double stepperAdestPosition = 0;
double stepperAtimer = 0;
int    stepperAtoggle = 0;
double stepperAspeed = 4800 / substeps; //higher is slower

void setup(void) {

  Serial.begin(9600);
  Serial.println("Initializing...");
  Serial.println(temperature);

  //READY!
  delay(1000);
}

void loop(void) {

  temperature = getTemp();
  Serial.println(temperature);

  if (temperature < 27.0) {
    //Close vents.
    stepperAdestPosition = 100;

    Serial.println("CHECKPOINT 001");
  }

  if (temperature > 28.0) {
    //Open vents.
    stepperAdestPosition = 200; //calibrate these!

    Serial.println("CHECKPOINT 002");
  }

  while ((stepperAdistanceToGo() != 0) ) {
    stepperArun();
  }
  delay(1000);
}

// THESE CONTROL THE STEPPER MOTORS

double stepperAdistanceToGo() {
  return abs(stepperAdestPosition - stepperAcurrPosition);
}

void stepperArun() {
  double dir = 0;

  if (stepperAdistanceToGo() >= 1) {
    //SET DIRECTION
    if (stepperAdestPosition > stepperAcurrPosition) {
      digitalWrite(stepperApinDir, 1);
      dir = 1;
    } else {
      digitalWrite(stepperApinDir, 0);
      dir = -1;
    }
    if (micros() < (stepperAtimer - stepperAspeed)) {
      //rollover bug... fix
      stepperAtimer = micros();
    }
    //PULSE AT SPEED LIMIT
    if (micros() >= (stepperAtimer + stepperAspeed)) {
      digitalWrite(stepperApinStep, stepperAtoggle);
      stepperAtimer = micros();
      stepperAtoggle = !stepperAtoggle;
      stepperAcurrPosition += dir;
    }
  }
  Serial.println("STEPPER RUN COMPLETE");
}

float getTemp() {
  //DS18S20 temp in DEG Celsius

  byte data[12];
  byte addr[8];

  if ( !ds.search(addr)) {
    // no more sensors on chain, reset search
    ds.reset_search();
    return -1000;
  }

  if ( OneWire::crc8( addr, 7) != addr[7]) {
    Serial.println("CRC is not valid!");
    return -1000;
  }

  if ( addr[0] != 0x10 && addr[0] != 0x28) {
    Serial.print("Device is not recognized");
    return -1000;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44, 1); // start conversion, with parasite power on at the end

  byte present = ds.reset();
  ds.select(addr);
  ds.write(0xBE); // Read Scratchpad


  for (int i = 0; i < 9; i++) { // we need 9 bytes
    data[i] = ds.read();
  }

  ds.reset_search();

  byte MSB = data[1];
  byte LSB = data[0];

  float tempRead = ((MSB << 8) | LSB); // using two's compliment
  float TemperatureSum = tempRead / 16;

  return TemperatureSum;
}