#include "HX711.h"
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include "max6675.h"
#include <SD.h>
#include <SPI.h>
#include <DS3231.h>
#include <Adafruit_ssd1306syp.h>

//Calibration constant for load cell
#define calibration_factor -7050.0 //This value is obtained using the SparkFun_HX711_Calibration sketch

//Pin definitions
#define PIN1200 9
#define PIN2200 8  
#define DOUT  3
#define CLK  2

//Load cell object allocations
HX711 scale(DOUT, CLK);
HX711 scale200(PIN1200, PIN2200);

//LCD Object
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

//OLED Object
Adafruit_ssd1306syp display(37,35);

//Water value variable
int value = 0;

//Water level variable
int adc_id = 0;

//Clock object
DS3231 rtc(A4, A5);

//Pin allocation for thermocouple
int ktcSO = 49;
int ktcCS = 47;
int ktcCLK = 45;

//Constant for sd card
const int chipSelect = 53;

//Thermocouple object
MAX6675 ktc(ktcCLK, ktcCS, ktcSO);

void setup() {
  //Initializes LCD
  lcd.init();
  lcd.backlight();
  display.initialize();
  
  //Begins serial output
  Serial.begin(9600);
  
  //Begins SD Card Output
  pinMode(53, OUTPUT);

  //Starts day and time clock
  rtc.begin();
//Initializes date and time
//---------------------------
  //rtc.setDOW(WEDNESDAY);
  //rtc.setTime(14,06,20);
  //rtc.setDate(1,2,2019);
//---------------------------

  // SD initialization
  if (!SD.begin(chipSelect))
  {
    Serial.println("Card failed, or not present.");
  } 
  else
  {
    Serial.println("Card initialized");
  }

  //Sets scale calibrations and tares
  scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
  scale200.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
  scale200.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
  delay(500);
}

void loop() {
  display.clear();
  // make a string for assembling the data to log:
  String dataString = "";
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Acuitive Technologies");
  display.update();

  //Sets position and prints date and time
  lcd.setCursor(0,2);
  lcd.print(rtc.getDateStr());
  lcd.setCursor(0,3); 
  lcd.print(rtc.getTimeStr());

  //Adds date and time to datafile string
  dataString += String(rtc.getDateStr());
  dataString += " -- ";
  dataString += String(rtc.getTimeStr());
  dataString += ",";

  //Sets position and prints load cell 1 value
  lcd.setCursor(0,1);
  lcd.print("1: ");
  lcd.print(scale.get_units(), 1);

  //Adds load cell value to datafile string
  float scale1 = scale.get_units();
  dataString += String(scale1);
  dataString += ",";

  //Sets position and prints load cell 2 value
  lcd.setCursor(9,1);
  lcd.print("2: ");
  lcd.print(scale200.get_units(), 1);

  //Adds load cell value to datafile string
  float scale2 = scale200.get_units();
  dataString += String(scale2);
  dataString += ",";

  //Gets water level and prints to LCD
  float value = analogRead(adc_id); // get adc value
  lcd.setCursor(0,0);
  lcd.print("W: ");
  lcd.print(value);

  //Adds water level to datafile string
  dataString += String(value);
  dataString += ",";

  //Sets position and prints temperature in celsius
  lcd.setCursor(9,0);
  lcd.print("C: ");
  lcd.print(ktc.readCelsius());

  //Adds temperature to datafile string
  int ktcread = ktc.readCelsius();
  dataString += String(ktcread);

  //Open datafile 
  File dataFile = SD.open("DataLog.txt", FILE_WRITE);

  //If the datafile is available, write to it:
  if (dataFile) 
  {
    dataFile.println(dataString);
    dataFile.close();
  } 
  //If the file isn't open, pop up an error:
  else 
  {
    Serial.println("error opening datalog.txt");
  }
}