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

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// for your motor
const int ledPin1 = 27;
const int ledPin2 = 26;
const int tempSensor = 33;
const float BETA = 3950; // should match the Beta Coefficient of the thermistor

//Temperature Threshold

const int temp_threshold = 25;


// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 19, 18, 5, 17);
LiquidCrystal_I2C lcd( 0x27 , 16, 2);



void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  // LCD Set Up
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("The IoT Thermal System!!");
}

void loop(){
  //lcd.clear();
  //lcd.setCursor(0,1);
  //lcd.print("The IoT Thermal System!!");

  //int temp_value = analogRead(tempSensor);
  float temp_value = getTemperature();
  delay(1000);
  
  if(temp_value > temp_threshold){
    lcd.clear();
    lcd.setCursor(0,1);
    lcd.print("Temperature ABOVE OPTM!!");
    motorStart();
    blinkLed(ledPin1);
    blinkLed(ledPin2);
  }
  else if(temp_value == temp_threshold){
    lcd.clear();
    lcd.setCursor(0,1);
    lcd.print("Temperature AT OPTM!!");

  }
  else{
    lcd.clear();
    lcd.setCursor(0,1);
    lcd.print("Temperature AT OPTM!!");

  }



}

float getTemperature()  {
  int analogValue = analogRead(tempSensor);
  float celsius = 1 / (log(1 / (4096.0 / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  return celsius;
  //delay(1000);
}

void motorStart() {
  // step one revolution  in one direction:
  Serial.println("clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);

  // step one revolution in the other direction:
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
}

void blinkLed(int pin){
  digitalWrite(pin , HIGH);
  delay(200);
  digitalWrite(pin , LOW);
  delay(200);
}