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39
include/README
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39
include/README
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This directory is intended for project header files.
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A header file is a file containing C declarations and macro definitions
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to be shared between several project source files. You request the use of a
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header file in your project source file (C, C++, etc) located in `src` folder
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by including it, with the C preprocessing directive `#include'.
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```src/main.c
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#include "header.h"
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int main (void)
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{
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...
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}
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```
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Including a header file produces the same results as copying the header file
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into each source file that needs it. Such copying would be time-consuming
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and error-prone. With a header file, the related declarations appear
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in only one place. If they need to be changed, they can be changed in one
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place, and programs that include the header file will automatically use the
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new version when next recompiled. The header file eliminates the labor of
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finding and changing all the copies as well as the risk that a failure to
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find one copy will result in inconsistencies within a program.
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In C, the usual convention is to give header files names that end with `.h'.
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It is most portable to use only letters, digits, dashes, and underscores in
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header file names, and at most one dot.
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Read more about using header files in official GCC documentation:
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* Include Syntax
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* Include Operation
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* Once-Only Headers
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* Computed Includes
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https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
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132
include/sensorapi/sensorapi.pde
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132
include/sensorapi/sensorapi.pde
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#include <Wire.h>
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#include <Adafruit_Sensor.h>
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#include <Adafruit_BMP085_U.h>
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/* This driver uses the Adafruit unified sensor library (Adafruit_Sensor),
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which provides a common 'type' for sensor data and some helper functions.
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To use this driver you will also need to download the Adafruit_Sensor
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library and include it in your libraries folder.
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You should also assign a unique ID to this sensor for use with
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the Adafruit Sensor API so that you can identify this particular
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sensor in any data logs, etc. To assign a unique ID, simply
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provide an appropriate value in the constructor below (12345
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is used by default in this example).
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Connections
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===========
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Connect SCL to analog 5
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Connect SDA to analog 4
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Connect VDD to 3.3V DC
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Connect GROUND to common ground
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History
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=======
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2013/JUN/17 - Updated altitude calculations (KTOWN)
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2013/FEB/13 - First version (KTOWN)
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*/
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Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
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/**************************************************************************/
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/*
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Displays some basic information on this sensor from the unified
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sensor API sensor_t type (see Adafruit_Sensor for more information)
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*/
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/**************************************************************************/
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void displaySensorDetails(void)
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{
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sensor_t sensor;
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bmp.getSensor(&sensor);
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Serial.println("------------------------------------");
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Serial.print ("Sensor: "); Serial.println(sensor.name);
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Serial.print ("Driver Ver: "); Serial.println(sensor.version);
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Serial.print ("Unique ID: "); Serial.println(sensor.sensor_id);
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Serial.print ("Max Value: "); Serial.print(sensor.max_value); Serial.println(" hPa");
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Serial.print ("Min Value: "); Serial.print(sensor.min_value); Serial.println(" hPa");
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Serial.print ("Resolution: "); Serial.print(sensor.resolution); Serial.println(" hPa");
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Serial.println("------------------------------------");
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Serial.println("");
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delay(500);
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}
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/**************************************************************************/
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/*
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Arduino setup function (automatically called at startup)
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*/
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/**************************************************************************/
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void setup(void)
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{
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Serial.begin(9600);
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Serial.println("Pressure Sensor Test"); Serial.println("");
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/* Initialise the sensor */
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if(!bmp.begin())
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{
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/* There was a problem detecting the BMP085 ... check your connections */
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Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
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while(1);
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}
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/* Display some basic information on this sensor */
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displaySensorDetails();
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}
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/**************************************************************************/
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/*
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Arduino loop function, called once 'setup' is complete (your own code
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should go here)
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*/
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/**************************************************************************/
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void loop(void)
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{
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/* Get a new sensor event */
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sensors_event_t event;
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bmp.getEvent(&event);
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/* Display the results (barometric pressure is measure in hPa) */
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if (event.pressure)
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{
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/* Display atmospheric pressue in hPa */
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Serial.print("Pressure: ");
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Serial.print(event.pressure);
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Serial.println(" hPa");
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/* Calculating altitude with reasonable accuracy requires pressure *
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* sea level pressure for your position at the moment the data is *
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* converted, as well as the ambient temperature in degress *
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* celcius. If you don't have these values, a 'generic' value of *
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* 1013.25 hPa can be used (defined as SENSORS_PRESSURE_SEALEVELHPA *
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* in sensors.h), but this isn't ideal and will give variable *
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* results from one day to the next. *
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* *
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* You can usually find the current SLP value by looking at weather *
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* websites or from environmental information centers near any major *
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* airport. *
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* *
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* For example, for Paris, France you can check the current mean *
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* pressure and sea level at: http://bit.ly/16Au8ol */
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/* First we get the current temperature from the BMP085 */
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float temperature;
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bmp.getTemperature(&temperature);
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Serial.print("Temperature: ");
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Serial.print(temperature);
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Serial.println(" C");
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/* Then convert the atmospheric pressure, and SLP to altitude */
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/* Update this next line with the current SLP for better results */
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float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;
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Serial.print("Altitude: ");
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Serial.print(bmp.pressureToAltitude(seaLevelPressure,
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event.pressure));
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Serial.println(" m");
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Serial.println("");
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}
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else
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{
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Serial.println("Sensor error");
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}
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delay(1000);
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}
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