#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68

int* ano,i;
char* myStrings[]={"Segunda-Feira", "Terca-Feira", "Quarta-Feira","Quinta-Feira", "Sexta-Feira","Sabado","Domingo"};

int tempc = 0,tempf=0; // temperature variables
int samples[8]; // variables to make a better precision
int maxi = -100,mini = 100; // to start max/min temperature

// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
  return ( (val/10*16) + (val%10) );
}

// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
  return ( (val/16*10) + (val%16) );
}

// Stops the DS1307, but it has the side effect of setting seconds to 0
// Probably only want to use this for testing
/*void stopDs1307()
{
  Wire.beginTransmission(DS1307_I2C_ADDRESS);
  Wire.send(0);
  Wire.send(0x80);
  Wire.endTransmission();
}*/

// 1) Sets the date and time on the ds1307
// 2) Starts the clock
// 3) Sets hour mode to 24 hour clock
// Assumes you're passing in valid numbers
void setDateDs1307(byte second,        // 0-59
                   byte minute,        // 0-59
                   byte hour,          // 1-23
                   byte dayOfWeek,     // 1-7
                   byte dayOfMonth,    // 1-28/29/30/31
                   byte month,         // 1-12
                   byte year)          // 0-99
{
   Wire.beginTransmission(DS1307_I2C_ADDRESS);
   Wire.send(0);
   Wire.send(decToBcd(second));    // 0 to bit 7 starts the clock
   Wire.send(decToBcd(minute));
   Wire.send(decToBcd(hour));      // If you want 12 hour am/pm you need to set
                                   // bit 6 (also need to change readDateDs1307)
   Wire.send(decToBcd(dayOfWeek));
   Wire.send(decToBcd(dayOfMonth));
   Wire.send(decToBcd(month));
   Wire.send(decToBcd(year));
   Wire.endTransmission();
}

// Gets the date and time from the ds1307
void getDateDs1307(byte *second,
          byte *minute,
          byte *hour,
          byte *dayOfWeek,
          byte *dayOfMonth,
          byte *month,
          byte *year)
{
  // Reset the register pointer
  Wire.beginTransmission(DS1307_I2C_ADDRESS);
  Wire.send(0);
  Wire.endTransmission();

  Wire.requestFrom(DS1307_I2C_ADDRESS, 7);

  // A few of these need masks because certain bits are control bits
  *second     = bcdToDec(Wire.receive() & 0x7f);
  *minute     = bcdToDec(Wire.receive());
  *hour       = bcdToDec(Wire.receive() & 0x3f);  // Need to change this if 12 hour am/pm
  *dayOfWeek  = bcdToDec(Wire.receive());
  *dayOfMonth = bcdToDec(Wire.receive());
  *month      = bcdToDec(Wire.receive());
  *year       = bcdToDec(Wire.receive());
}

void setup()
{
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
  Wire.begin();
  Serial.begin(9600);

  // Change these values to what you want to set your clock to.
  // You probably only want to set your clock once and then remove
  // the setDateDs1307 call.
  second = 40;
  minute = 45;
  hour = 10;
  dayOfWeek = 6;
  dayOfMonth = 1;
  month = 8;
  year = 9;
  setDateDs1307(second, minute, hour, dayOfWeek, dayOfMonth, month, year);
}

void loop()
{

 
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;

  getDateDs1307(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);
  
  ano = 2000 + year; // Changed to a int so it can show the year in 20XX style
  
    for(i = 0;i< =7;i++){ // gets 8 samples of temperature

    samples[i] = ( 5 * analogRead(0) * 100) / 1024;
    tempc = tempc + samples[i];
    delay(50);
    }
    
    tempc = tempc/8; // better precision
    tempf = (tempc * 9)/ 5 + 32; // converts to fahrenheit
    
    if(tempc > maxi) {maxi = tempc;} // set max temperature
    if(tempc < mini) {mini = tempc;} // set min temperature
  
  if(hour<10) {Serial.print("0");} 
  Serial.print(hour, DEC);
  Serial.print(":");
  if(minute<10) {Serial.print("0");} 
  Serial.print(minute, DEC);
  Serial.print(":");
  if(second<10) {Serial.print("0");} 
  Serial.print(second, DEC);
  Serial.print("  ");
  if(dayOfMonth<10) {Serial.print("0");}
  Serial.print(dayOfMonth, DEC);
  Serial.print("/");
  if(month<10) {Serial.print("0");}
  Serial.print(month, DEC);
  Serial.print("/");
  Serial.print(ano, DEC);
  Serial.print("  Dia da semana: ");
  Serial.print(myStrings[dayOfWeek-1]);
   Serial.print(" - Temperatura:a: ");
  Serial.print(tempc,DEC);
  Serial.print("C ,  ");
  Serial.print(tempf,DEC);
  Serial.print("F - ");
  Serial.print(maxi,DEC);
  Serial.print(" Max, ");
  Serial.print(mini,DEC);
  Serial.println(" Min");

tempc = 0;

  delay(600);
}