#include <LiquidCrystal.h>
  #include "Wire.h"
    LiquidCrystal lcd(12,11, 5, 4, 3, 2);

   float  pressao;
   float p0,P;
   int altitude;
  byte i=0;
  float accuml =0; // varialvel para guardar o valor
  float temp = 0 ; //variavel para guardar o valor

  #define BMP085_ADDRESS 0x77

  const unsigned char oversampling_setting = 3;
  const unsigned char pressure_waittime[4] = {
  5, 8, 14, 26 };

  int ac1, ac2, ac3;
  unsigned int ac4, ac5, ac6;
  int b1, b2, mb, mc, md;
  int temperature=0;
  long pressure=0;
  //double Po;
  double pressaoB = 101325 ;
  long b5;

  void setup()
{
  Serial.begin(9600); // start serial for output
  lcd.begin(16,2);
   lcd.setCursor(10, 2);                        // Posiciona cursor posição 6 linha 0
  lcd.print("P");                             // Imprime P  Pressao
   lcd.setCursor(11, 0);                       // Posiciona cursor posição 11 linha 0
    lcd.print("T");
   lcd.setCursor(0,0);
   lcd.print("A");
   lcd.setCursor(1,0);
   lcd.print("-");
  lcd.setCursor(0,1);
   lcd.print("H");
  Serial.println("Setting up BMP085");

  Wire.begin();

  bmp085_get_cal_data( );
   void bmp085_read_temperature_and_pressure(int& temperature,long& pressure);
  Serial.print("Temperature:");
  lcd.setCursor(11,2);
   lcd.print(pressure/100);

 float temp =(float)temperature / 10.0;
   Serial.print(temp,2);
   lcd.setCursor(12,0);
   lcd.print(temp,2);
   float pressao = (float)pressao/100.0;
   Serial.print("Pressao:");
   Serial.print(pressure);
    Serial.print(" ");
    lcd.setCursor(12,2);
     lcd.print(pressure);
     lcd.setCursor(11,2);
     lcd.print("-");

}
void loop()
{
   bmp085_read_temperature_and_pressure(&temperature,& pressure);
   Serial.print("Temperature:");
   float temp =(float)temperature / 10.0;
  //  for ( i = 0; i<20; i++);                         // for de 20 vezes:  de 0 a 49 = 50 vezes
    // {
         //  temp =   temp =(float)temperature / 10.0; ;                          // le o valor da temperatura
          // accuml = accuml + xpto;        // Acumula 20vezes as temperatura lidas
     // }
     //temp_M = accuml / 20;                 //  calcula a temperatura média das ultima 20 leituras


   Serial.print(temp,2);

    lcd.setCursor(12,0);
   lcd.print(temp,2);
   Serial.print("Pressao:");
   Serial.print(pressure/100);
   Serial.print(" ");

       lcd.setCursor(12,2);
       lcd.print(pressure/100);


  pressao=  pressure;//
  p0 = pressaoB;

  altitude = (float)44330 * (1 - pow(((float) pressao/p0), 0.1902950));

  Serial.print("ALTITUDE barometrica;");
   Serial.print(altitude );

   Serial.println("m ");

   lcd.setCursor(2,0);
  lcd.print(altitude);
  lcd.setCursor(4,0);
  lcd.print("m");

   //ALTITUDE RELATIVA



    Serial.print("ALTITUDEreal;");
   Serial.print(altitude );
  Serial.print(altitude );
   Serial.println("m ");
    lcd.setCursor(2,1);
   lcd.print(altitude);
    lcd.setCursor(4,1);
    lcd.print("m");


}
 void bmp085_read_temperature_and_pressure(int* temperature, long* pressure) {
 int ut= bmp085_read_ut();
  long up = bmp085_read_up();
   long x1, x2, x3, b3, b5, b6, p;
    unsigned long b4, b7;

 //calculate the temperature
 x1 = ((long)ut - ac6) * ac5 >> 15;
 x2 = ((long) mc << 11) / (x1 + md);
  b5 = x1 + x2;
  *temperature = (b5 + 8) >> 4;

  //calculate the pressure
  b6 = b5 - 4000;
  x1 = (b2 * (b6 * b6 >> 12)) >> 11;
  x2 = ac2 * b6 >> 11;
  x3 = x1 + x2;

 //b3 = (((int32_t) ac1 * 4 + x3)<> 2;

if (oversampling_setting == 3) b3 = ((int32_t) ac1 * 4 + x3 + 2) << 1;
if (oversampling_setting == 2) b3 = ((int32_t) ac1 * 4 + x3 + 2);
if (oversampling_setting == 1) b3 = ((int32_t) ac1 * 4 + x3 + 2) >> 1;
if (oversampling_setting == 0) b3 = ((int32_t) ac1 * 4 + x3 + 2) >> 2;

x1 = ac3 * b6 >> 13;
x2 = (b1 * (b6 * b6 >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (ac4 * (uint32_t) (x3 + 32768)) >> 15;
b7 = ((uint32_t) up - b3) * (50000 >> oversampling_setting);
p = b7 < 0x80000000 ? (b7 * 2) / b4 : (b7 / b4) * 2;

x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
*pressure = p + ((x1 + x2 + 3791) >> 4);

}

unsigned int bmp085_read_ut() {
write_register(0xf4,0x2e);
delay(5); //longer than 4.5 ms
return read_int_register(0xf6);
}

void bmp085_get_cal_data() {
Serial.println("Reading Calibration Data");
ac1 = read_int_register(0xAA);
Serial.print("AC1: ");
Serial.println(ac1,DEC);
ac2 = read_int_register(0xAC);
Serial.print("AC2: ");
Serial.println(ac2,DEC);
ac3 = read_int_register(0xAE);
Serial.print("AC3: ");
Serial.println(ac3,DEC);
ac4 = read_int_register(0xB0);
Serial.print("AC4: ");
Serial.println(ac4,DEC);
ac5 = read_int_register(0xB2);
Serial.print("AC5: ");
Serial.println(ac5,DEC);
ac6 = read_int_register(0xB4);
Serial.print("AC6: ");
Serial.println(ac6,DEC);
b1 = read_int_register(0xB6);
Serial.print("B1: ");
Serial.println(b1,DEC);
b2 = read_int_register(0xB8);
Serial.print("B2: ");
Serial.println(b1,DEC);
mb = read_int_register(0xBA);
Serial.print("MB: ");
Serial.println(mb,DEC);
mc = read_int_register(0xBC);
Serial.print("MC: ");
Serial.println(mc,DEC);
md = read_int_register(0xBE);
Serial.print("MD: ");
Serial.println(md,DEC);
}

long bmp085_read_up() {
write_register(0xf4,0x34+(oversampling_setting<<6));
delay(pressure_waittime[oversampling_setting]);

unsigned char msb, lsb, xlsb;
Wire.beginTransmission(BMP085_ADDRESS);
Wire.write(0xf6); // register to read
Wire.endTransmission();

Wire.requestFrom(BMP085_ADDRESS, 3); // read a byte
while(!Wire.available()) {
// waiting
}
msb = Wire.read();
while(!Wire.available()) {
// waiting
}
lsb |= Wire.read();
while(!Wire.available()) {
// waiting
}
xlsb |= Wire.read();
return (((long)msb<<16) | ((long)lsb<<8) | ((long)xlsb)) >>(8-oversampling_setting);
}

void write_register(unsigned char r, unsigned char v)
{
Wire.beginTransmission(BMP085_ADDRESS);
Wire.write(r);
Wire.write(v);
Wire.endTransmission();
}

char read_register(unsigned char r)
{
unsigned char v;
Wire.beginTransmission(BMP085_ADDRESS);
Wire.write(r); // register to read
Wire.endTransmission();

Wire.requestFrom(BMP085_ADDRESS, 1); // read a byte
while(!Wire.available()) {
// waiting
}
v = Wire.read();
return v;
}

int read_int_register(unsigned char r)
{
unsigned char msb, lsb;
Wire.beginTransmission(BMP085_ADDRESS);
Wire.write(r); // register to read
Wire.endTransmission();

Wire.requestFrom(BMP085_ADDRESS, 2); // read a byte
while(!Wire.available()) {
// waiting
}
msb = Wire.read();
while(!Wire.available()) {
// waiting
}
lsb = Wire.read();
return (((int)msb<<8) | ((int)lsb));
}