/*
  Controlling a servo position using a potentiometer (variable resistor)
  by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

  modified on 8 Nov 2013
  by Scott Fitzgerald
  http://www.arduino.cc/en/Tutorial/Knob
*/

#include <OneWire.h>
#include <Servo.h>
#include <LiquidCrystal_I2C.h>
#include <DallasTemperature.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
Servo myservo;  // create servo object to control a servo

#define potPin 0
// Define to which pin of the Arduino the 1-Wire bus is connected:
#define ONE_WIRE_BUS 8
// Create a new instance of the oneWire class to communicate with any OneWire device:
OneWire oneWire(ONE_WIRE_BUS);
// Pass the oneWire reference to DallasTemperature library:
DallasTemperature sensors(&oneWire);

int val;    // variable to read the value from the analog pin
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
String degF = "\337F"; // degrees Farenheit symbol
int maxOpen = 4; 

int lastSetF;
float lastF;
float lastDifference;

void setup() {

  myservo.attach(9);  // attaches the servo on pin 9 to the servo object

  lcd.init(); // initialize the lcd
  lcd.backlight();

    // Start up the library:
  sensors.begin();

  Serial.begin(9600);
}

void loop() {

  int setValue = analogRead(potPin);
  // Send the command for all devices on the bus to perform a temperature conversion:
  sensors.requestTemperatures();
  // Fetch the temperature in degrees Celsius for device index:
  float celsius = sensors.getTempCByIndex(0); // the index 0 refers to the first device
  // Fetch the temperature in degrees Fahrenheit for device index:
  float farenheit = sensors.getTempFByIndex(0);

int setTempF = map(setValue,0,1023,59,72);
  
  if(lastSetF != setTempF || farenheit != lastF){

  lcd.setCursor(0,0);
  lcd.print("Set: ");
  lcd.print(setTempF);
  lcd.print(degF);
  lcd.print(" | ");
  lcd.print("Zone 1");
  //lcd.print();

  lcd.setCursor(0,1);
    lcd.print("Cur: ");
  lcd.print(round(farenheit));
  lcd.print(degF);
  lcd.print(" | ");
  lcd.print(" 1");
  //lcd.print(degC);

  lastSetF = setTempF;
  lastF = farenheit;
  }

float difference = farenheit - setTempF;
if(difference >= maxOpen && lastDifference != difference){
  myservo.write(180);                  // sets the servo position according to the scaled value
   lastDifference = difference;
  } else if( farenheit - setTempF >0){
    lastDifference = difference;
    float setPoint = (difference / maxOpen) * 90 + 90;
    myservo.write(setPoint);
  }  else {
    myservo.write(90);
    lastDifference = difference;
  }

}