#include <OneWire.h>
#include <DallasTemperature.h>
#include <SD.h>
#include <RTClib.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

const int sampleWindow = 50;  // Sample window width in mS (50 mS = 20Hz)
unsigned int sample;
 
#define SENSOR_PIN A0
#define DHTPIN 2     // what pin we're connected to
#define ONE_WIRE_BUS 4
#define CS_SD 10
#define DHTTYPE DHT22   // DHT 22  (AM2302)

RTC_DS3231 rtc; //Create rtc object
OneWire oneWire(ONE_WIRE_BUS);	// Setup a oneWire instance to communicate with any OneWire device
DallasTemperature sensors(&oneWire); // Pass oneWire reference to DallasTemperature library
File myFile; // Create a file to store the data
DHT dht(DHTPIN, DHTTYPE); // Create dht object
DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address
DateTime now;
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4);

int numberOfDevices; // Number of temperature devices found
float t1,t2,t3,t4,t5;
String date;
String time;
float humidity;
float db;

void setup(void) {
  sensors.begin();	// Start up the library
  Serial.begin(9600);
  pinMode (SENSOR_PIN, INPUT); // Set the signal pin as input  
  while (!rtc.begin()) {
    Serial.println("Connecting to RTC");
    delay(500);
  }
  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.print("Hello World");

  pinMode(CS_SD, OUTPUT);

  // Grab a count of devices on the wire
  numberOfDevices = sensors.getDeviceCount();
  
  // locate devices on the bus
  Serial.print("Locating devices...");
  Serial.print("Found ");
  Serial.print(numberOfDevices, DEC);
  Serial.println(" devices.");

  // setup for the SD card
  Serial.print("Initializing SD card...");

  if(!SD.begin(CS_SD)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");
    
  //open file
  myFile = SD.open("logger.txt", FILE_WRITE);

  // if the file opened ok, write to it:
  if (myFile) {
    Serial.println("File opened ok");
    // print the headings for our data
    myFile.println("Date,Time,T1,T2,T3,T4,T5,Humidity");
  }
  myFile.close();
}

void loop(void) {

  readClock();
  readTemp();
  humidity = dht.readHumidity();
  readDecibel();
  //printData();
  displayData();
  writeToSD();

  delay(5000);
}

void readTemp() {
  // Send the command to get temperatures
  sensors.requestTemperatures(); 
  t1 = sensors.getTempCByIndex(0);
  t2 = sensors.getTempCByIndex(1);
  t3 = sensors.getTempCByIndex(2);
  t4 = sensors.getTempCByIndex(3);
  t5 = sensors.getTempCByIndex(4);
}

void writeToSD() {
  //open file
  myFile = SD.open("logger.txt", FILE_WRITE);

  // if the file opened ok, write to it:
  if (myFile) {
    Serial.println("File opened ok");
    myFile.print(date);
    myFile.print(",");
    myFile.print(time);
    myFile.print(",");
    myFile.print(t1);
    myFile.print(",");
    myFile.print(t1);
    myFile.print(",");
    myFile.print(t2);
    myFile.print(",");
    myFile.print(t3);
    myFile.print(",");
    myFile.print(t4);
    myFile.print(",");
    myFile.print(t5);
    myFile.print(",");
    myFile.println(humidity);
  }
  myFile.close();

}

void readClock () {
  now = rtc.now();
  date = now.timestamp(DateTime::TIMESTAMP_DATE);
  time = now.timestamp(DateTime::TIMESTAMP_TIME);
}

void readDecibel() {
  unsigned long startMillis= millis();                   // Start of sample window
  float peakToPeak = 0;                                  // peak-to-peak level
 
  unsigned int signalMax = 0;                            //minimum value
  unsigned int signalMin = 1024;                         //maximum value
 
                                                          // collect data for 50 mS
  while (millis() - startMillis < sampleWindow) {
    sample = analogRead(SENSOR_PIN);                    //get reading from microphone
    if (sample < 1024)                                  // toss out spurious readings
    {
      if (sample > signalMax)
      {
        signalMax = sample;                           // save just the max levels
      }
      else if (sample < signalMin)
      {
        signalMin = sample;                           // save just the min levels
      }
    }
  }
 
  peakToPeak = signalMax - signalMin;                    // max - min = peak-peak amplitude
  db = map(peakToPeak,20,900,49.5,90);             //calibrate for deciBels
 
}

void displayData() {
  lcd.setCursor(0,0);
  lcd.print("T1:");
  lcd.print(t1);
  lcd.print("  T2:");
  lcd.print(t2);
  lcd.setCursor(0,1);
  lcd.print("T3:");
  lcd.print(t3);
  lcd.print("  T4:");
  lcd.print(t4);
  lcd.setCursor(0,2);
  lcd.print("T5:");
  lcd.print(t5);
  lcd.print("  H :");
  lcd.print(humidity);
  lcd.setCursor(0,3);
  lcd.print("db:");
  lcd.print(db);
}

void printData() {
  Serial.print(date);
  Serial.print(",");
  Serial.print(time);
  Serial.print(",");
  //print the temperature in Celsius
  Serial.print("T1: ");
  Serial.print(t1);
  Serial.print((char)176);//shows degrees character
  Serial.print(",");
  Serial.print("T2: ");
  Serial.print(t2);
  Serial.print((char)176);//shows degrees character
  Serial.print(",");
  Serial.print("T3: ");
  Serial.print(t3);
  Serial.print((char)176);//shows degrees character
  Serial.print(",");
  Serial.print("T4: ");
  Serial.print(t4);
  Serial.print((char)176);//shows degrees character
  Serial.print(",");
  Serial.print("T5: ");
  Serial.print(t5);
  Serial.print((char)176);//shows degrees character
  Serial.print(",");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("Loudness: ");
  Serial.print(db);
  Serial.println("dB");
}