Andrew's git - arduino-weather.git/blob - libraries/Adafruit_BMP085_Unified-master/examples/sensorapi/sensorapi.pde

   1#include <Wire.h>
   2#include <Adafruit_Sensor.h>
   3#include <Adafruit_BMP085_U.h>
   4
   5/* This driver uses the Adafruit unified sensor library (Adafruit_Sensor),
   6   which provides a common 'type' for sensor data and some helper functions.
   7   
   8   To use this driver you will also need to download the Adafruit_Sensor
   9   library and include it in your libraries folder.
  10
  11   You should also assign a unique ID to this sensor for use with
  12   the Adafruit Sensor API so that you can identify this particular
  13   sensor in any data logs, etc.  To assign a unique ID, simply
  14   provide an appropriate value in the constructor below (12345
  15   is used by default in this example).
  16   
  17   Connections
  18   ===========
  19   Connect SCL to analog 5
  20   Connect SDA to analog 4
  21   Connect VDD to 3.3V DC
  22   Connect GROUND to common ground
  23    
  24   History
  25   =======
  26   2013/JUN/17  - Updated altitude calculations (KTOWN)
  27   2013/FEB/13  - First version (KTOWN)
  28*/
  29   
  30Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
  31
  32/**************************************************************************/
  33/*
  34    Displays some basic information on this sensor from the unified
  35    sensor API sensor_t type (see Adafruit_Sensor for more information)
  36*/
  37/**************************************************************************/
  38void displaySensorDetails(void)
  39{
  40  sensor_t sensor;
  41  bmp.getSensor(&sensor);
  42  Serial.println("------------------------------------");
  43  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  44  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  45  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  46  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" hPa");
  47  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" hPa");
  48  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" hPa");  
  49  Serial.println("------------------------------------");
  50  Serial.println("");
  51  delay(500);
  52}
  53
  54/**************************************************************************/
  55/*
  56    Arduino setup function (automatically called at startup)
  57*/
  58/**************************************************************************/
  59void setup(void) 
  60{
  61  Serial.begin(9600);
  62  Serial.println("Pressure Sensor Test"); Serial.println("");
  63  
  64  /* Initialise the sensor */
  65  if(!bmp.begin())
  66  {
  67    /* There was a problem detecting the BMP085 ... check your connections */
  68    Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
  69    while(1);
  70  }
  71  
  72  /* Display some basic information on this sensor */
  73  displaySensorDetails();
  74}
  75
  76/**************************************************************************/
  77/*
  78    Arduino loop function, called once 'setup' is complete (your own code
  79    should go here)
  80*/
  81/**************************************************************************/
  82void loop(void) 
  83{
  84  /* Get a new sensor event */ 
  85  sensors_event_t event;
  86  bmp.getEvent(&event);
  87 
  88  /* Display the results (barometric pressure is measure in hPa) */
  89  if (event.pressure)
  90  {
  91    /* Display atmospheric pressue in hPa */
  92    Serial.print("Pressure:    ");
  93    Serial.print(event.pressure);
  94    Serial.println(" hPa");
  95    
  96    /* Calculating altitude with reasonable accuracy requires pressure    *
  97     * sea level pressure for your position at the moment the data is     *
  98     * converted, as well as the ambient temperature in degress           *
  99     * celcius.  If you don't have these values, a 'generic' value of     *
 100     * 1013.25 hPa can be used (defined as SENSORS_PRESSURE_SEALEVELHPA   *
 101     * in sensors.h), but this isn't ideal and will give variable         *
 102     * results from one day to the next.                                  *
 103     *                                                                    *
 104     * You can usually find the current SLP value by looking at weather   *
 105     * websites or from environmental information centers near any major  *
 106     * airport.                                                           *
 107     *                                                                    *
 108     * For example, for Paris, France you can check the current mean      *
 109     * pressure and sea level at: http://bit.ly/16Au8ol                   */
 110     
 111    /* First we get the current temperature from the BMP085 */
 112    float temperature;
 113    bmp.getTemperature(&temperature);
 114    Serial.print("Temperature: ");
 115    Serial.print(temperature);
 116    Serial.println(" C");
 117
 118    /* Then convert the atmospheric pressure, and SLP to altitude         */
 119    /* Update this next line with the current SLP for better results      */
 120    float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;
 121    Serial.print("Altitude:    "); 
 122    Serial.print(bmp.pressureToAltitude(seaLevelPressure,
 123                                        event.pressure)); 
 124    Serial.println(" m");
 125    Serial.println("");
 126  }
 127  else
 128  {
 129    Serial.println("Sensor error");
 130  }
 131  delay(1000);
 132}