#include <Stepper.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

const float BETA = 3950;
const int stepsPerRevolution = 200; 
float currentSpeed;


 // change this to fit the number of steps per revolution
// for your motor

// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

 void setup() 
 
 {
  lcd.init();
  lcd.backlight();
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(9600);
  
}


void loop() 

{
  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  
  
  float motorSpeed = (54*(celsius)) - 1290;

  if(celsius >= 25 && celsius <=35)
  {
    if(currentSpeed <= motorSpeed)
    {
      myStepper.setSpeed(motorSpeed);
      myStepper.step(stepsPerRevolution);
      currentSpeed = motorSpeed;
    }

   else if(currentSpeed >= motorSpeed )
    { 
      myStepper.setSpeed(motorSpeed);
      myStepper.step(stepsPerRevolution);
      currentSpeed = motorSpeed;
    }
    
  }

  // step one revolution  in one direction:
  //myStepper.step(stepsPerRevolution);
  //delay(500);

  // step one revolution in the other direction:
  //myStepper.step(-stepsPerRevolution);
  //delay(500);

  Serial.print(" Temp:  ");
  Serial.println(celsius);
  Serial.print (" MotorSpeed: ");
  Serial.println(motorSpeed);
  Serial.print(" CurrentSpeed:");
  Serial.println(currentSpeed);
}