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libraries/Adafruit_BMP183_Library/examples/BMP183test/BMP183test.ino

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+#include <SPI.h>
+#include <Adafruit_Sensor.h>
+#include <Adafruit_BMP183.h>
+
+// For hardware SPI:
+// Connect SCK to SPI Clock, SDO to SPI MISO, and SDI to SPI MOSI
+// See  http://arduino.cc/en/Reference/SPI for your Arduino's SPI pins!
+// On UNO, Clock is #13, SDO/MISO is #12 and SDI/MOSI is #11
+
+// You can also use software SPI and define your own pins!
+#define BMP183_CLK  13
+#define BMP183_SDO  12  // AKA MISO
+#define BMP183_SDI  11  // AKA MOSI
+
+// You'll also need a chip-select pin, use any pin!
+#define BMP183_CS   10
+
+// initialize with hardware SPI
+//Adafruit_BMP183 bmp = Adafruit_BMP183(BMP183_CS);
+// or initialize with software SPI and use any 4 pins
+Adafruit_BMP183 bmp = Adafruit_BMP183(BMP183_CLK, BMP183_SDO, BMP183_SDI, BMP183_CS);
+
+/**************************************************************************/
+/*
+    Arduino setup function (automatically called at startup)
+*/
+/**************************************************************************/
+void setup(void) 
+{
+  Serial.begin(9600);
+  Serial.println("BMP183 Pressure Sensor Test"); Serial.println("");
+  
+  /* Initialise the sensor */
+  if(!bmp.begin())
+  {
+    /* There was a problem detecting the BMP183 ... check your connections */
+    Serial.print("Ooops, no BMP183 detected ... Check your wiring!");
+    while(1);
+  }
+}
+
+/**************************************************************************/
+/*
+    Arduino loop function, called once 'setup' is complete (your own code
+    should go here)
+*/
+/**************************************************************************/
+void loop(void) 
+{
+    /* Display atmospheric pressue in Pascals */
+    Serial.print("Pressure:    ");
+    Serial.print(bmp.getPressure());
+    Serial.print(" Pascals / ");
+    Serial.print(bmp.getPressure() / 100);
+    Serial.println(" millibar (hPa)");
+
+    /* First we get the current temperature from the BMP085 */
+    float temperature;
+    temperature = bmp.getTemperature();
+    Serial.print("Temperature: ");
+    Serial.print(temperature);
+    Serial.println(" C");
+    
+    /* Calculating altitude with reasonable accuracy requires pressure    *
+     * sea level pressure for your position at the moment the data is     *
+     * converted. If you don't have these values, a 'generic' value of    *
+     * 1013.25 mbar can be used (defined as SENSORS_PRESSURE_SEALEVELHPA  *
+     * in sensors.h), but this isn't ideal and will give variable         *
+     * results from one day to the next.                                  *
+     *                                                                    *
+     * You can usually find the current SLP value by looking at weather   *
+     * websites or from environmental information centers near any major  *
+     * airport.                                                           *
+     *                                                                    *
+     * For example, for Paris, France you can check the current mean      *
+     * pressure and sea level at: http://bit.ly/16Au8ol                   */
+     
+
+    /* Then convert the atmospheric pressure, SLP and temp to altitude    */
+    /* Update this next line with the current SLP for better results      */
+    float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA; // should be ~1000
+    Serial.print("Sea level pressure: "); 
+    Serial.print(SENSORS_PRESSURE_SEALEVELHPA);
+    Serial.println(" millibar/hPa");
+    
+    Serial.print("Altitude:    "); 
+    Serial.print(bmp.getAltitude(seaLevelPressure)); 
+    Serial.println(" m");
+    Serial.println("");
+
+    delay(1000);
+}