133 lines
4.9 KiB
Plaintext
133 lines
4.9 KiB
Plaintext
#include <Wire.h>
|
|
#include <Adafruit_Sensor.h>
|
|
#include <Adafruit_BMP085_U.h>
|
|
|
|
/* This driver uses the Adafruit unified sensor library (Adafruit_Sensor),
|
|
which provides a common 'type' for sensor data and some helper functions.
|
|
|
|
To use this driver you will also need to download the Adafruit_Sensor
|
|
library and include it in your libraries folder.
|
|
|
|
You should also assign a unique ID to this sensor for use with
|
|
the Adafruit Sensor API so that you can identify this particular
|
|
sensor in any data logs, etc. To assign a unique ID, simply
|
|
provide an appropriate value in the constructor below (12345
|
|
is used by default in this example).
|
|
|
|
Connections
|
|
===========
|
|
Connect SCL to analog 5
|
|
Connect SDA to analog 4
|
|
Connect VDD to 3.3V DC
|
|
Connect GROUND to common ground
|
|
|
|
History
|
|
=======
|
|
2013/JUN/17 - Updated altitude calculations (KTOWN)
|
|
2013/FEB/13 - First version (KTOWN)
|
|
*/
|
|
|
|
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
|
|
|
|
/**************************************************************************/
|
|
/*
|
|
Displays some basic information on this sensor from the unified
|
|
sensor API sensor_t type (see Adafruit_Sensor for more information)
|
|
*/
|
|
/**************************************************************************/
|
|
void displaySensorDetails(void)
|
|
{
|
|
sensor_t sensor;
|
|
bmp.getSensor(&sensor);
|
|
Serial.println("------------------------------------");
|
|
Serial.print ("Sensor: "); Serial.println(sensor.name);
|
|
Serial.print ("Driver Ver: "); Serial.println(sensor.version);
|
|
Serial.print ("Unique ID: "); Serial.println(sensor.sensor_id);
|
|
Serial.print ("Max Value: "); Serial.print(sensor.max_value); Serial.println(" hPa");
|
|
Serial.print ("Min Value: "); Serial.print(sensor.min_value); Serial.println(" hPa");
|
|
Serial.print ("Resolution: "); Serial.print(sensor.resolution); Serial.println(" hPa");
|
|
Serial.println("------------------------------------");
|
|
Serial.println("");
|
|
delay(500);
|
|
}
|
|
|
|
/**************************************************************************/
|
|
/*
|
|
Arduino setup function (automatically called at startup)
|
|
*/
|
|
/**************************************************************************/
|
|
void setup(void)
|
|
{
|
|
Serial.begin(9600);
|
|
Serial.println("Pressure Sensor Test"); Serial.println("");
|
|
|
|
/* Initialise the sensor */
|
|
if(!bmp.begin())
|
|
{
|
|
/* There was a problem detecting the BMP085 ... check your connections */
|
|
Serial.print("Ooops, no BMP085 detected ... Check your wiring or I2C ADDR!");
|
|
while(1);
|
|
}
|
|
|
|
/* Display some basic information on this sensor */
|
|
displaySensorDetails();
|
|
}
|
|
|
|
/**************************************************************************/
|
|
/*
|
|
Arduino loop function, called once 'setup' is complete (your own code
|
|
should go here)
|
|
*/
|
|
/**************************************************************************/
|
|
void loop(void)
|
|
{
|
|
/* Get a new sensor event */
|
|
sensors_event_t event;
|
|
bmp.getEvent(&event);
|
|
|
|
/* Display the results (barometric pressure is measure in hPa) */
|
|
if (event.pressure)
|
|
{
|
|
/* Display atmospheric pressue in hPa */
|
|
Serial.print("Pressure: ");
|
|
Serial.print(event.pressure);
|
|
Serial.println(" hPa");
|
|
|
|
/* Calculating altitude with reasonable accuracy requires pressure *
|
|
* sea level pressure for your position at the moment the data is *
|
|
* converted, as well as the ambient temperature in degress *
|
|
* celcius. If you don't have these values, a 'generic' value of *
|
|
* 1013.25 hPa 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 */
|
|
|
|
/* First we get the current temperature from the BMP085 */
|
|
float temperature;
|
|
bmp.getTemperature(&temperature);
|
|
Serial.print("Temperature: ");
|
|
Serial.print(temperature);
|
|
Serial.println(" C");
|
|
|
|
/* Then convert the atmospheric pressure, and SLP to altitude */
|
|
/* Update this next line with the current SLP for better results */
|
|
float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;
|
|
Serial.print("Altitude: ");
|
|
Serial.print(bmp.pressureToAltitude(seaLevelPressure,
|
|
event.pressure));
|
|
Serial.println(" m");
|
|
Serial.println("");
|
|
}
|
|
else
|
|
{
|
|
Serial.println("Sensor error");
|
|
}
|
|
delay(1000);
|
|
}
|