Subversion Repositories FlightCtrl

// BMP085_test2

// by Filipe Vieira

// Simple test of BMP085 output using default settings using dynamic update.

// In order to take full advantage of dynamic measurement, automatic temperature updates must be disabled.

// To disable automatic updates set AUTO_UPDATE_TEMPERATURE to false in bmp085.h.

// IMPORTANT!! To get correct values you MUST CHANGE init() parameters, in

// this example I've set 250m based on GPS data for my location.

#include <Wire.h>

#include <BMP085.h>

BMP085 dps = BMP085();      // Digital Pressure Sensor

long Pressure = 0, Altitude = 0;

unsigned long time1=0;

void setup(void) {

  Serial.begin(9600);

  Wire.begin();

  delay(1000);

  // uncomment for different initialization settings

  //dps.init();     // QFE (Field Elevation above ground level) is set to 0 meters.

                  // same as init(MODE_STANDARD, 0, true);

  //dps.init(MODE_STANDARD, 101850, false);  // 101850Pa = 1018.50hPa, false = using Pa units

                  // this initialization is useful for normalizing pressure to specific datum.

                  // OR setting current local hPa information from a weather station/local airport (QNH).

  dps.init(MODE_STANDARD, 25000, true);  // 250 meters, true = using meter units

                  // this initialization is useful if current altitude is known,

                  // pressure will be calculated based on TruePressure and known altitude.

  // note: use zeroCal only after initialization.

  // dps.zeroCal(101800, 0);    // set zero point

}

void loop(void) {

  // calculate temperature every 1 sec (dynamic measurement)

  // NOTE: in order to take full advantage of dynamic measurement set AUTO_UPDATE_TEMPERATURE to false in bmp085.h

  if (((millis() - time1)/1000.0) >= 1.0) {

     dps.calcTrueTemperature();

     time1 = millis();

  }

  dps.getPressure(&Pressure);

  dps.getAltitude(&Altitude);

  Serial.print("  Alt(cm):");

  Serial.print(Altitude);

  Serial.print("  Pressure(Pa):");

  Serial.println(Pressure);

}