/**************************************************************************** * BMP085.h - BMP085/I2C (Digital Pressure Sensor) library for Arduino * * Copyright 2010-2012 Filipe Vieira & various contributors * * * * This file is part of BMP085 Arduino library. * * * * This library is free software: you can redistribute it and/or modify * * it under the terms of the GNU Lesser General Public License as published * * by the Free Software Foundation, either version 3 of the License, or * * (at your option) any later version. * * * * This program is distributed in the hope that it will be useful, * * but WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * * GNU Lesser General Public License for more details. * * * * You should have received a copy of the GNU Lesser General Public License * * along with this program. If not, see . * ****************************************************************************/ /**************************************************************************** * Tested on Arduino Mega with BMP085 Breakout * * SDA -> pin 20 (no pull up resistors) * * SCL -> pin 21 (no pull up resistors) * * XCLR -> not connected * * EOC -> not connected * * GND -> pin GND * * VCC -> pin 3.3V * * NOTE: SCL and SDA needs pull-up resistors for each I2C bus. * * 2.2kOhm..10kOhm, typ. 4.7kOhm * *****************************************************************************/ #ifndef BMP085_h #define BMP085_h #if defined(ARDUINO) && ARDUINO >= 100 #include "Arduino.h" #else #include "WProgram.h" #endif #define BMP085_ADDR 0x77 //0x77 default I2C address #define BUFFER_SIZE 3 #define AUTO_UPDATE_TEMPERATURE true //default is true // when true, temperature is measured everytime pressure is measured (Auto). // when false, user chooses when to measure temperature (just call calcTrueTemperature()). // used for dynamic measurement to increase sample rate (see BMP085 modes below). /* ---- Registers ---- */ #define CAL_AC1 0xAA // R Calibration data (16 bits) #define CAL_AC2 0xAC // R Calibration data (16 bits) #define CAL_AC3 0xAE // R Calibration data (16 bits) #define CAL_AC4 0xB0 // R Calibration data (16 bits) #define CAL_AC5 0xB2 // R Calibration data (16 bits) #define CAL_AC6 0xB4 // R Calibration data (16 bits) #define CAL_B1 0xB6 // R Calibration data (16 bits) #define CAL_B2 0xB8 // R Calibration data (16 bits) #define CAL_MB 0xBA // R Calibration data (16 bits) #define CAL_MC 0xBC // R Calibration data (16 bits) #define CAL_MD 0xBE // R Calibration data (16 bits) #define CONTROL 0xF4 // W Control register #define CONTROL_OUTPUT 0xF6 // R Output registers 0xF6=MSB, 0xF7=LSB, 0xF8=XLSB // unused registers #define SOFTRESET 0xE0 #define VERSION 0xD1 // ML_VERSION pos=0 len=4 msk=0F AL_VERSION pos=4 len=4 msk=f0 #define CHIPID 0xD0 // pos=0 mask=FF len=8 // BMP085_CHIP_ID=0x55 /************************************/ /* REGISTERS PARAMETERS */ /************************************/ // BMP085 Modes #define MODE_ULTRA_LOW_POWER 0 //oversampling=0, internalsamples=1, maxconvtimepressure=4.5ms, avgcurrent=3uA, RMSnoise_hPA=0.06, RMSnoise_m=0.5 #define MODE_STANDARD 1 //oversampling=1, internalsamples=2, maxconvtimepressure=7.5ms, avgcurrent=5uA, RMSnoise_hPA=0.05, RMSnoise_m=0.4 #define MODE_HIGHRES 2 //oversampling=2, internalsamples=4, maxconvtimepressure=13.5ms, avgcurrent=7uA, RMSnoise_hPA=0.04, RMSnoise_m=0.3 #define MODE_ULTRA_HIGHRES 3 //oversampling=3, internalsamples=8, maxconvtimepressure=25.5ms, avgcurrent=12uA, RMSnoise_hPA=0.03, RMSnoise_m=0.25 // "Sampling rate can be increased to 128 samples per second (standard mode) for // dynamic measurement.In this case it is sufficient to measure temperature only // once per second and to use this value for all pressure measurements during period." // (from BMP085 datasheet Rev1.2 page 10). // To use dynamic measurement set AUTO_UPDATE_TEMPERATURE to false and // call calcTrueTemperature() from your code. // Control register #define READ_TEMPERATURE 0x2E #define READ_PRESSURE 0x34 //Other #define MSLP 101325 // Mean Sea Level Pressure = 1013.25 hPA (1hPa = 100Pa = 1mbar) class BMP085 { public: BMP085(); // BMP initialization void init(); // sets current elevation above ground level to 0 meters void init(byte _BMPMode, int32_t _initVal, bool _centimeters); // sets a reference datum // if _centimeters=false _initVal is Pa // Who Am I byte getDevAddr(); // BMP mode byte getMode(); void setMode(byte _BMPMode); // BMP085 mode // initialization void setLocalPressure(int32_t _Pa); // set known barometric pressure as reference Ex. QNH void setLocalAbsAlt(int32_t _centimeters); // set known altitude as reference void setAltOffset(int32_t _centimeters); // altitude offset void sethPaOffset(int32_t _Pa); // pressure offset void zeroCal(int32_t _Pa, int32_t _centimeters);// zero Calibrate output to a specific Pa/altitude // BMP Sensors void getPressure(int32_t *_Pa); // pressure in Pa + offset void getAltitude(int32_t *_centimeters); // altitude in centimeters + offset void getTemperature(int32_t *_Temperature); // temperature in C� void calcTrueTemperature(); // calc temperature data b5 (only needed if AUTO_UPDATE_TEMPERATURE is false) void calcTruePressure(long *_TruePressure); // calc Pressure in Pa // dummy stuff void dumpCalData(); // debug only void writemem(uint8_t _addr, uint8_t _val); void readmem(uint8_t _addr, uint8_t _nbytes, uint8_t __buff[]); private: int ac1,ac2,ac3,b1,b2,mb,mc,md; // cal data unsigned int ac4,ac5,ac6; // cal data long b5, oldEMA; // temperature data uint8_t _dev_address; byte _buff[BUFFER_SIZE]; // buffer MSB LSB XLSB int _oss; // OverSamplingSetting int _pressure_waittime[4]; // Max. Conversion Time Pressure is ms for each mode int32_t _cm_Offset, _Pa_Offset; int32_t _param_datum, _param_centimeters; void getCalData(); }; #endif