#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS); // (a 4.7K resistor is necessary)
DallasTemperature sensors(&oneWire);
DeviceAddress Thermometer; // variable to hold device addresses
int deviceCount = 0;
// Addresses of 2 DS18B20s
uint8_t sensor1[8] = { 0x28, 0x63, 0x92, 0xF3, 0x62, 0x20, 0x01, 0x3C };
uint8_t sensor2[8] = { 0x28, 0x7F, 0x38, 0x01, 0x63, 0x20, 0x01, 0x49 };
 
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2

#define LOGO16_GLCD_HEIGHT 16 
#define LOGO16_GLCD_WIDTH  16 
static const unsigned char PROGMEM logo16_glcd_bmp[] =
{ B00000000, B11000000,
  B00000001, B11000000,
  B00000001, B11000000,
  B00000011, B11100000,
  B11110011, B11100000,
  B11111110, B11111000,
  B01111110, B11111111,
  B00110011, B10011111,
  B00011111, B11111100,
  B00001101, B01110000,
  B00011011, B10100000,
  B00111111, B11100000,
  B00111111, B11110000,
  B01111100, B11110000,
  B01110000, B01110000,
  B00000000, B00110000 };

#if (SSD1306_LCDHEIGHT != 32)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

const int Led = 9;

const int Relay = 4;

const int diffDegree = 3;

long waitTime = 60000;
long TimeRequestMillis; 

char* relaystate = "Close";

bool lock = false;

void setup() {
  Serial.begin(9600);
  Serial.println("-----------------");
  Serial.println("");
  Serial.println("Initialisation...");
  Serial.println("");
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x32)
  display.display();
  delay(2000);

  // Clear the buffer.
  display.clearDisplay();
  
  pinMode(Relay, OUTPUT);
  digitalWrite(Relay, LOW);

  TimeRequestMillis = millis();
}
   

void loop() {

  sensors.requestTemperatures(); 

  unsigned long currentMillis = millis();

  Serial.print("temperature_Panneaux - ");
  float temperature_Panneaux = getTemperature(sensor2);

  Serial.print("temperature_Boiler - ");
  float temperature_Boiler = getTemperature(sensor1);

  if(lock == false){
  
    if((temperature_Panneaux > temperature_Boiler + diffDegree) && (lock == false)){
      digitalWrite(Relay, HIGH);
      relaystate = "Open";
      Serial.println("Relay Open");
    }
    else{
      digitalWrite(Relay, LOW);
      relaystate = "Close"; 
      Serial.println("Relay Close");
    }   
    Serial.println("Lock");
    lock = true;
  }

  if(currentMillis - TimeRequestMillis > waitTime){    
    TimeRequestMillis = currentMillis;
    Serial.println("Unlocked !");
    lock = false;
  }
    
  // text display values
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.print("Panneaux: ");
  display.print(temperature_Panneaux);
  display.println("C");
  display.print("Boiler: ");
  display.print(temperature_Boiler);
  display.println("C");
  display.print("Statut relay : ");
  display.println(relaystate);
  display.display();
  delay(2000); //mettre plus ! ;) 
  display.clearDisplay();
  
}

float getTemperature(DeviceAddress deviceAddress)
{
  float tempC = sensors.getTempC(deviceAddress);
  Serial.print(tempC);
  Serial.print("C");
  Serial.println();
  return tempC;
}