112 lines
4.1 KiB
C++
112 lines
4.1 KiB
C++
// I2Cdev library collection - BMP085 basic Arduino example sketch
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// Based on register information stored in the I2Cdevlib internal database
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// 2012-06-28 by Jeff Rowberg <jeff@rowberg.net>
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// Updates should (hopefully) always be available at https://github.com/jrowberg/i2cdevlib
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//
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// Changelog:
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// 2012-06-28 - initial release, dynamically built
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/* ============================================
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I2Cdev device library code is placed under the MIT license
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Copyright (c) 2012 Jeff Rowberg
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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===============================================
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*/
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// Arduino Wire library is required if I2Cdev I2CDEV_ARDUINO_WIRE implementation
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// is used in I2Cdev.h
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#include "Wire.h"
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// I2Cdev and BMP085 must be installed as libraries, or else the .cpp/.h files
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// for both classes must be in the include path of your project
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#include "I2Cdev.h"
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#include "BMP085.h"
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// class default I2C address is 0x77
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// specific I2C addresses may be passed as a parameter here
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// (though the BMP085 supports only one address)
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BMP085 barometer;
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float temperature;
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float pressure;
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float altitude;
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int32_t lastMicros;
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#define LED_PIN 13 // (Arduino is 13, Teensy is 11, Teensy++ is 6)
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bool blinkState = false;
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void setup() {
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// join I2C bus (I2Cdev library doesn't do this automatically)
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Wire.begin();
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// initialize serial communication
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// (38400 chosen because it works as well at 8MHz as it does at 16MHz, but
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// it's really up to you depending on your project)
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Serial.begin(38400);
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// initialize device
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Serial.println("Initializing I2C devices...");
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barometer.initialize();
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// verify connection
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Serial.println("Testing device connections...");
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Serial.println(barometer.testConnection() ? "BMP085 connection successful" : "BMP085 connection failed");
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// configure LED pin for activity indication
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pinMode(LED_PIN, OUTPUT);
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}
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void loop() {
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// request temperature
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barometer.setControl(BMP085_MODE_TEMPERATURE);
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// wait appropriate time for conversion (4.5ms delay)
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lastMicros = micros();
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while (micros() - lastMicros < barometer.getMeasureDelayMicroseconds());
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// read calibrated temperature value in degrees Celsius
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temperature = barometer.getTemperatureC();
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// request pressure (3x oversampling mode, high detail, 23.5ms delay)
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barometer.setControl(BMP085_MODE_PRESSURE_3);
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while (micros() - lastMicros < barometer.getMeasureDelayMicroseconds());
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// read calibrated pressure value in Pascals (Pa)
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pressure = barometer.getPressure();
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// calculate absolute altitude in meters based on known pressure
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// (may pass a second "sea level pressure" parameter here,
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// otherwise uses the standard value of 101325 Pa)
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altitude = barometer.getAltitude(pressure);
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// display measured values if appropriate
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Serial.print("T/P/A\t");
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Serial.print(temperature); Serial.print("\t");
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Serial.print(pressure); Serial.print("\t");
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Serial.print(altitude);
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Serial.println("");
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// blink LED to indicate activity
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blinkState = !blinkState;
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digitalWrite(LED_PIN, blinkState);
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// delay 100 msec to allow visually parsing blink and any serial output
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delay(100);
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} |