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add BMP280 sensor

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noerw 2016-12-06 13:57:40 +01:00
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commit d847ba7f43
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/*
BME280.cpp
This code records data from the BME280 sensor and provides an API.
This file is part of the Arduino BME280 library.
Copyright (C) 2016 Tyler Glenn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written: Dec 30 2015.
Last Updated: Jan 1 2016. - Happy New year!
This header must be included in any derived code or copies of the code.
Based on the data sheet provided by Bosch for the Bme280 environmental sensor,
calibration code based on algorithms providedBosch, some unit conversations courtesy
of www.endmemo.com, altitude equation courtesy of NOAA, and dew point equation
courtesy of Brian McNoldy at http://andrew.rsmas.miami.edu.
*/
/* ==== Includes ==== */
#include <Wire.h>
#include "BME280.h"
/* ==== END Includes ==== */
/* ==== Methods ==== */
float BME280::CalculateTemperature(int32_t raw, int32_t& t_fine, bool celsius)
{
// Code based on calibration algorthim provided by Bosch.
int32_t var1, var2, final;
uint16_t dig_T1 = (dig[1] << 8) | dig[0];
int16_t dig_T2 = (dig[3] << 8) | dig[2];
int16_t dig_T3 = (dig[5] << 8) | dig[4];
var1 = ((((raw >> 3) - ((int32_t)dig_T1 << 1))) * ((int32_t)dig_T2)) >> 11;
var2 = (((((raw >> 4) - ((int32_t)dig_T1)) * ((raw >> 4) - ((int32_t)dig_T1))) >> 12) * ((int32_t)dig_T3)) >> 14;
t_fine = var1 + var2;
final = (t_fine * 5 + 128) >> 8;
return celsius ? final/100.0 : final/100.0*9.0/5.0 + 32.0;
}
float BME280::CalculateHumidity(int32_t raw, int32_t t_fine){
// Code based on calibration algorthim provided by Bosch.
int32_t var1;
int8_t dig_H1 = dig[24];
int16_t dig_H2 = (dig[26] << 8) | dig[25];
int8_t dig_H3 = dig[27];
int16_t dig_H4 = (dig[28] << 4) | (0x0F & dig[29]);
int16_t dig_H5 = (dig[30] << 4) | ((dig[29] >> 4) & 0x0F);
int8_t dig_H6 = dig[31];
var1 = (t_fine - ((int32_t)76800));
var1 = (((((raw << 14) - (((int32_t)dig_H4) << 20) - (((int32_t)dig_H5) * var1)) +
((int32_t)16384)) >> 15) * (((((((var1 * ((int32_t)dig_H6)) >> 10) * (((var1 *
((int32_t)dig_H3)) >> 11) + ((int32_t)32768))) >> 10) + ((int32_t)2097152)) *
((int32_t)dig_H2) + 8192) >> 14));
var1 = (var1 - (((((var1 >> 15) * (var1 >> 15)) >> 7) * ((int32_t)dig_H1)) >> 4));
var1 = (var1 < 0 ? 0 : var1);
var1 = (var1 > 419430400 ? 419430400 : var1);
return ((uint32_t)(var1 >> 12))/1024.0;
}
float BME280::CalculatePressure(int32_t raw, int32_t t_fine, uint8_t unit){
// Code based on calibration algorthim provided by Bosch.
int64_t var1, var2, pressure;
float final;
uint16_t dig_P1 = (dig[7] << 8) | dig[6];
int16_t dig_P2 = (dig[9] << 8) | dig[8];
int16_t dig_P3 = (dig[11] << 8) | dig[10];
int16_t dig_P4 = (dig[13] << 8) | dig[12];
int16_t dig_P5 = (dig[15] << 8) | dig[14];
int16_t dig_P6 = (dig[17] << 8) | dig[16];
int16_t dig_P7 = (dig[19] << 8) | dig[18];
int16_t dig_P8 = (dig[21] << 8) | dig[20];
int16_t dig_P9 = (dig[23] << 8) | dig[22];
var1 = (int64_t)t_fine - 128000;
var2 = var1 * var1 * (int64_t)dig_P6;
var2 = var2 + ((var1 * (int64_t)dig_P5) << 17);
var2 = var2 + (((int64_t)dig_P4) << 35);
var1 = ((var1 * var1 * (int64_t)dig_P3) >> 8) + ((var1 * (int64_t)dig_P2) << 12);
var1 = (((((int64_t)1) << 47) + var1)) * ((int64_t)dig_P1) >> 33;
if (var1 == 0) { return NAN; } // Don't divide by zero.
pressure = 1048576 - raw;
pressure = (((pressure << 31) - var2) * 3125)/var1;
var1 = (((int64_t)dig_P9) * (pressure >> 13) * (pressure >> 13)) >> 25;
var2 = (((int64_t)dig_P8) * pressure) >> 19;
pressure = ((pressure + var1 + var2) >> 8) + (((int64_t)dig_P7) << 4);
final = ((uint32_t)pressure)/256.0;
// Conversion units courtesy of www.endmemo.com.
switch(unit){
case 0x1: /* hPa */
final /= 100.0;
break;
case 0x2: /* inHg */
final /= 3386.3752577878; /* final pa * 1inHg/3386.3752577878Pa */
break;
case 0x3: /* atm */
final /= 101324.99766353; /* final pa * 1 atm/101324.99766353Pa */
break;
case 0x4: /* bar */
final /= 100*1000; /* final pa * 1 bar/100kPa */
break;
case 0x5: /* torr */
final /= 133.32236534674; /* final pa * 1 torr/133.32236534674Pa */
break;
case 0x6: /* N/m^2 */
break; /* 1Pa / N/m^2 */
case 0x7: /* psi */
final /= 6894.744825494; /* final pa * 1psi/6894.744825494Pa */
break;
default: /* Pa (case: 0) */
break;
}
return final;
}
BME280::BME280(uint8_t tosr, uint8_t hosr, uint8_t posr, uint8_t mode, uint8_t st, uint8_t filter,
bool spiEnable):
tempOversamplingRate(tosr), humidityOversamplingRate(hosr),
pressureOversamplingRate(posr), mode(mode), standbyTime(st), filter(filter),
spiEnable(spiEnable)
{
// ctrl_hum register. (ctrl_hum[2:0] = Humidity oversampling rate.)
controlHumidity = humidityOversamplingRate;
// ctrl_meas register. (ctrl_meas[7:5] = temperature oversampling rate, ctrl_meas[4:2] = pressure oversampling rate, ctrl_meas[1:0] = mode.)
controlMeasure = (tempOversamplingRate << 5) | (pressureOversamplingRate << 2) | mode;
// config register. (config[7:5] = standby time, config[4:2] = filter, ctrl_meas[0] = spi enable.)
config = (standbyTime << 5) | (filter << 2) | spiEnable;
}
void BME280::setMode(uint8_t mode){
controlMeasure = controlMeasure | mode;
WriteRegister(CTRL_MEAS_ADDR, controlMeasure);
}
float BME280::temp(bool celsius){
int32_t data[8];
int32_t t_fine;
if(!ReadData(data)){ return NAN; }
uint32_t rawTemp = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
return CalculateTemperature(rawTemp, t_fine, celsius);
}
float BME280::press(uint8_t unit){
int32_t data[8];
int32_t t_fine;
if(!ReadData(data)){ return NAN; }
uint32_t rawTemp = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
uint32_t rawPressure = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
CalculateTemperature(rawTemp, t_fine);
return CalculatePressure(rawPressure, t_fine, unit);
}
float BME280::hum(){
int32_t data[8];
int32_t t_fine;
if(!ReadData(data)){ return NAN; }
uint32_t rawTemp = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
uint32_t rawHumidity = (data[6] << 8) | data[7];
CalculateTemperature(rawTemp, t_fine);
return CalculateHumidity(rawHumidity, t_fine);
}
void BME280::read(float& pressure, float& temp, float& humidity, bool metric, uint8_t p_unit){
int32_t data[8];
int32_t t_fine;
if(!ReadData(data)){
pressure = temp = humidity = NAN;
return;
}
uint32_t rawPressure = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
uint32_t rawTemp = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
uint32_t rawHumidity = (data[6] << 8) | data[7];
temp = CalculateTemperature(rawTemp, t_fine, metric);
pressure = CalculatePressure(rawPressure, t_fine, p_unit);
humidity = CalculateHumidity(rawHumidity, t_fine);
}
float BME280::alt(bool metric, float seaLevelPressure){
float temp, hum, pres;
read(pres, temp, hum, metric);
return alt(pres, metric, seaLevelPressure);
}
float BME280::alt(float pressure, bool metric, float seaLevelPressure){
// Equations courtesy of NOAA;
float altitude = NAN;
if (!isnan(pressure) && !isnan(seaLevelPressure)){
altitude = 1000.0 * ( seaLevelPressure - pressure ) / 3386.3752577878;
}
return metric ? altitude * 0.3048 : altitude;
}
float BME280::dew(bool metric){
float temp, hum, pres;
read(pres, temp, hum, metric);
return dew(temp, hum, metric);
}
float BME280::dew(float temp, float hum, bool metric){
// Equations courtesy of Brian McNoldy from http://andrew.rsmas.miami.edu;
float dewPoint = NAN;
if (metric && !isnan(temp) && !isnan(hum)){
dewPoint = 243.04 * (log(hum/100.0) + ((17.625 * temp)/(243.04 + temp)))
/(17.625 - log(hum/100.0) - ((17.625 * temp)/(243.04 + temp)));
}else if (!isnan(temp) && !isnan(hum)){
float ctemp = (temp - 32.0) * 5.0/9.0;
dewPoint = 243.04 * (log(hum/100.0) + ((17.625 * ctemp)/(243.04 + ctemp)))
/(17.625 - log(hum/100.0) - ((17.625 * ctemp)/(243.04 + ctemp)));
dewPoint = dewPoint * 9.0/5.0 + 32.0;
}
return dewPoint;
}
/* ==== END Methods ==== */

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/*
BME280.h
This code records data from the BME280 sensor and provides an API.
This file is part of the Arduino BME280 library.
Copyright (C) 2016 Tyler Glenn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written: Dec 30 2015.
Last Updated: Jan 1 2016. - Happy New year!
This code is licensed under the GNU LGPL and is open for ditrbution
and copying in accordance with the license.
This header must be included in any derived code or copies of the code.
Based on the data sheet provided by Bosch for the Bme280 environmental sensor.
*/
#ifndef TG_BME_280_H
#define TG_BME_280_H
/* ==== Includes ==== */
#include "Arduino.h"
/* ==== END Includes ==== */
/* ==== Defines ==== */
#define CTRL_HUM_ADDR 0xF2
#define CTRL_MEAS_ADDR 0xF4
#define CONFIG_ADDR 0xF5
#define PRESS_ADDR 0xF7
#define TEMP_ADDR 0xFA
#define HUM_ADDR 0xFD
#define TEMP_DIG_ADDR 0x88
#define PRESS_DIG_ADDR 0x8E
#define HUM_DIG_ADDR1 0xA1
#define HUM_DIG_ADDR2 0xE1
/* ==== END Defines ==== */
class BME280{
protected:
uint8_t tempOversamplingRate, humidityOversamplingRate, pressureOversamplingRate; // B000 = Skipped, B001 = x1, B010 = x2, B011 = x4, B100 = x8, B101/other = x16
uint8_t mode; // Sleep = B00, Normal = B01 and B10, Forced = B11
uint8_t standbyTime; // B000 = 0.5ms, B001 = 62.5ms, B010 = 125ms, B011 = 250ms, B100 = 250ms, B101 = 1000ms, B110 = 10ms, B111 = 20ms
uint8_t filter; // B000 = off, B001 = 2, B010 = 4, B011 = 8, B100/other = 16
uint8_t controlHumidity; // ctrl_hum register. (ctrl_hum[2:0] = Humidity oversampling rate.)
uint8_t controlMeasure; // ctrl_meas register. (ctrl_meas[7:5] = temperature oversampling rate, ctrl_meas[4:2] = pressure oversampling rate, ctrl_meas[1:0] = mode.)
uint8_t config; // config register. (config[7:5] = standby time, config[4:2] = filter, ctrl_meas[0] = spi enable.)
uint8_t dig[32];
bool spiEnable;
/* ==== Write values to BME280 registers. ==== */
virtual void WriteRegister(uint8_t addr, uint8_t data)=0;
/* ==== Read the the trim data from the BME280, return true if successful. ==== */
virtual bool ReadTrim()=0;
/* ==== Read the raw data from the BME280 into an array and return true if successful. ==== */
virtual bool ReadData(int32_t data[8])=0;
/* ==== Calculate the temperature from the BME280 raw data and BME280 trim, return a float. ==== */
float CalculateTemperature(int32_t raw, int32_t& t_fine, bool celsius = true);
/* ==== Calculate the humidity from the BME280 raw data and BME280 trim, return a float. ==== */
float CalculateHumidity(int32_t raw, int32_t t_fine);
/* ==== Calculate the pressure from the BME280 raw data and BME280 trim, return a float. ==== */
float CalculatePressure(int32_t raw, int32_t t_fine, uint8_t unit = 0x0); // unit: B000/other = Pa, B001 = hPa, B010 = inHg, B011 = atm, B100 = bar, B101 = torr, B110 = N/m^2, B111 = psi
public:
/* ==== Constructor used to create the class. All parameters have default values. ==== */
BME280(uint8_t tosr = 0x1, uint8_t hosr = 0x1, uint8_t posr = 0x1, uint8_t mode = 0x3,
uint8_t st = 0x5, uint8_t filter = 0x0, bool spiEnable = false); // Oversampling = 1, mode = normal, standby time = 1000ms, filter = none.
/* ==== Method used at start up to initialize the class. ==== */
virtual bool begin()=0;
void setMode(uint8_t mode);
/* ==== Read the temperature from the BME280 and return a float. ==== */
float temp(bool celsius = true);
/* ==== Read the pressure from the BME280 and return a float with the specified unit. ==== */
float press(uint8_t unit = 0x0); // unit: B000 = Pa, B001 = hPa, B010 = Hg, B011 = atm, B100 = bar, B101 = torr, B110 = N/m^2, B111 = psi
/* ==== Read the humidity from the BME280 and return a percentage as a float. ==== */
float hum();
/* ==== Read the data from the BME280 with the specified units. ==== */
void read(float& pressure, float& temp, float& humidity, bool metric = true, uint8_t p_unit = 0x0);
/* ==== Read the data from the BME280 with the specified units and then calculate the altitude. ==== */
float alt(bool metric = true, float seaLevelPressure = 101325);
/* ==== Calculate the altitude based on the pressure with the specified units. ==== */
float alt(float pressure, bool metric = true, float seaLevelPressure = 101325); // Pressure given in Pa.
/* ==== Read BME280 data and calculate the dew point with the specified units. ==== */
float dew(bool metric = true);
/* ==== Calculate the dew point based on the temperature and humidity with the specified units. ==== */
float dew(float temp, float hum, bool metric = true);
};
#endif // TG_BME_280_H

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/*
BME280I2CI2C.cpp
This code records data from the BME280I2C sensor and provides an API.
This file is part of the Arduino BME280I2C library.
Copyright (C) 2016 Tyler Glenn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written: Dec 30 2015.
Last Updated: Jan 1 2016. - Happy New year!
This header must be included in any derived code or copies of the code.
Based on the data sheet provided by Bosch for the BME280I2C environmental sensor,
calibration code based on algorithms providedBosch, some unit conversations courtesy
of www.endmemo.com, altitude equation courtesy of NOAA, and dew point equation
courtesy of Brian McNoldy at http://andrew.rsmas.miami.edu.
*/
/* ==== Includes ==== */
#include <Wire.h>
#include "BME280I2C.h"
/* ==== END Includes ==== */
/* ==== Methods ==== */
bool BME280I2C::Initialize() {
WriteRegister(CTRL_HUM_ADDR, controlHumidity);
WriteRegister(CTRL_MEAS_ADDR, controlMeasure);
WriteRegister(CONFIG_ADDR, config);
return ReadTrim();
}
void BME280I2C::WriteRegister(uint8_t addr, uint8_t data)
{
Wire.beginTransmission(bme_280_addr);
Wire.write(addr);
Wire.write(data);
Wire.endTransmission();
}
bool BME280I2C::ReadTrim()
{
uint8_t ord(0);
// Temp. Dig
Wire.beginTransmission(bme_280_addr);
Wire.write(TEMP_DIG_ADDR);
Wire.endTransmission();
Wire.requestFrom(bme_280_addr, (uint8_t)6);
while(Wire.available()){
dig[ord++] = Wire.read();
}
// Pressure Dig
Wire.beginTransmission(bme_280_addr);
Wire.write(PRESS_DIG_ADDR);
Wire.endTransmission();
Wire.requestFrom(bme_280_addr, (uint8_t)18);
while(Wire.available()){
dig[ord++] = Wire.read();
}
// Humidity Dig 1
Wire.beginTransmission(bme_280_addr);
Wire.write(HUM_DIG_ADDR1);
Wire.endTransmission();
Wire.requestFrom(bme_280_addr, (uint8_t)1);
while(Wire.available()){
dig[ord++] = Wire.read();
}
// Humidity Dig 2
Wire.beginTransmission(bme_280_addr);
Wire.write(HUM_DIG_ADDR2);
Wire.endTransmission();
Wire.requestFrom(bme_280_addr, (uint8_t)7);
while(Wire.available()){
dig[ord++] = Wire.read();
}
return ord == 32;
}
bool BME280I2C::ReadData(int32_t data[8]){
uint8_t ord = 0;
// Registers are in order. So we can start at the pressure register and read 8 bytes.
Wire.beginTransmission(bme_280_addr);
Wire.write(PRESS_ADDR);
Wire.endTransmission();
Wire.requestFrom(bme_280_addr, (uint8_t)8);
while(Wire.available()){
data[ord++] = Wire.read();
}
return ord == 8;
}
BME280I2C::BME280I2C(uint8_t tosr, uint8_t hosr, uint8_t posr, uint8_t mode, uint8_t st, uint8_t filter,
bool spiEnable, uint8_t bme_280_addr):
BME280(tosr, hosr, posr, mode, st, filter, spiEnable), bme_280_addr(bme_280_addr)
{
// ctrl_hum register. (ctrl_hum[2:0] = Humidity oversampling rate.)
controlHumidity = humidityOversamplingRate;
// ctrl_meas register. (ctrl_meas[7:5] = temperature oversampling rate, ctrl_meas[4:2] = pressure oversampling rate, ctrl_meas[1:0] = mode.)
controlMeasure = (tempOversamplingRate << 5) | (pressureOversamplingRate << 2) | mode;
// config register. (config[7:5] = standby time, config[4:2] = filter, ctrl_meas[0] = spi enable.)
config = (standbyTime << 5) | (filter << 2) | spiEnable;
}
#if defined(ARDUINO_ARCH_ESP8266)
bool BME280I2C::begin(int SDA, int SCL) {
// allow config of pins
Wire.begin(SDA,SCL);
return Initialize();
}
#endif
bool BME280I2C::begin(){
Wire.begin();
return Initialize();
}
/* ==== END Methods ==== */

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/*
BME280I2C.h
This code records data from the BME280 sensor and provides an API.
This file is part of the Arduino BME280 library.
Copyright (C) 2016 Tyler Glenn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written: Sep 19 2016.
Last Updated: Sep 19 2016. - Happy Fall! <5
This code is licensed under the GNU LGPL and is open for ditrbution
and copying in accordance with the license.
This header must be included in any derived code or copies of the code.
Based on the data sheet provided by Bosch for the Bme280 environmental sensor.
*/
#ifndef TG_BME_280_I2C_H
#define TG_BME_280_I2C_H
/* ==== Includes ==== */
#include "BME280.h"
/* ==== END Includes ==== */
/* ==== Defines ==== */
/* ==== END Defines ==== */
class BME280I2C: public BME280{
uint8_t bme_280_addr;
/* ==== Write configuration to BME280, return true if successful. ==== */
bool Initialize();
/* ==== Write values to BME280 registers. ==== */
virtual void WriteRegister(uint8_t addr, uint8_t data);
/* ==== Read the the trim data from the BME280, return true if successful. ==== */
virtual bool ReadTrim();
/* ==== Read the raw data from the BME280 into an array and return true if successful. ==== */
virtual bool ReadData(int32_t data[8]);
public:
/* ==== Constructor used to create the class. All parameters have default values. ==== */
BME280I2C(uint8_t tosr = 0x1, uint8_t hosr = 0x1, uint8_t posr = 0x1, uint8_t mode = 0x3,
uint8_t st = 0x5, uint8_t filter = 0x0, bool spiEnable = false,
uint8_t bme_280_addr = 0x76); // Oversampling = 1, mode = normal, standby time = 1000ms, filter = none.
/* ==== Method used at start up to initialize the class. Starts the I2C interface. ==== */
virtual bool begin();
#if defined(ARDUINO_ARCH_ESP8266)
/* ==== On esp8266 it is possible to define I2C pins ==== */
bool begin(int SDA, int SCL);
#endif
};
#endif // TG_BME_280_I2C_H

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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software and other kinds of works.
The licenses for most software and other practical works are designed
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share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
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# BME280
Provides an Arduino library for reading and interpreting Bosch BME280 data.
## Table of Contents
* [BME280](#bme280)
* [Table of Contents](#table_of_contents)
* [Summary](#summary)
* [Installation](#installation)
* [Usage](#usage)
* [Methods](#methods)
* [BME280(uint8_t tosr = 0x1, uint8_t hosr = 0x1, uint8_t posr = 0x1, uint8_t mode = 0x3, uint8_t st = 0x5, uint8_t filter = 0x0, bool spiEnable = false, uint8_t bme_280_addr = 0x76)](#methods)
* [bool begin()](#methods)
* [void setMode(uint8_t mode)](#methods)
* [float temp(bool celsius = true)](#methods)
* [float pres(uint8_t unit = 0x0)](#methods)
* [float hum()](#methods)
* [void data(float& pressure, float& temp, float& humidity, bool metric = true, uint8_t p_unit = 0x0)](#methods)
* [float alt(bool metric = true, float seaLevelPressure = 101325)](#methods)
* [float alt(float pressure, bool metric = true, float seaLevelPressure = 101325)](#methods)
* [float dew(bool metric = true)](#methods)
* [float dew(float temp, float hum, bool metric = true)](#methods)
* [Contributing](#contributing)
* [History](#history)
* [Credits](#credits)
* [License](#license)
<snippet>
<content>
## Summary
Reads temperature, humidity, and pressure. Calculates altitude and dew point. Provides functions for english and metric. Also reads pressure in Pa, hPa, inHg, atm, bar, torr, N/m^2 and psi.
## Installation
To use this library download the zip file, uncompress it to a folder named BME280. Move the folder to {Arduino Path}/libraries.
## Usage
Include the library at the top of your Arduino script. `#include <BME280>`
Create a global or local variable. `BME280 bme`
In your start up call `bme.begin()`.
Read the temperature, humidity, pressure, altitude and/or dew point.
`float pres, temp, hum`
`bme.data(pres, temp, hum)`
or
`temp = bme.temp()`
`hum = bme.hum()`
`pres = bme.pres()`
`float altitude, dewPoint`
`altitude = bme.alt()`
`dewPoint = bme.dew()`
Use `setMode(0x01)` to trigger a new measurement in forced mode. NOTE: It takes ~8ms to measure all values (temp, humidity & pressure) when using x1 oversampling (see datasheet 11.1). Thus a delay of >8ms should be used after triggering a measurement and before reading data to ensure that read values are the latest ones.
## Methods
#### BME280(uint8_t tosr = 0x1, uint8_t hosr = 0x1, uint8_t posr = 0x1, uint8_t mode = 0x3, uint8_t st = 0x5, uint8_t filter = 0x0, bool spiEnable = false, uint8_t bme_280_addr = 0x76)
Constructor used to create the class. All parameters have default values.
Return: None
* Temperature Oversampling Rate (tosr): uint8_t, default = 0x1
values: B000 = Skipped, B001 = x1, B010 = x2, B011 = x4, B100 = x8, B101/other = x16
* Humidity Oversampling Rate (hosr): uint8_t, default = 0x1
values: B000 = Skipped, B001 = x1, B010 = x2, B011 = x4, B100 = x8, B101/other = x16
* Pressure Oversampling Rate (posr): uint8_t, default = 0x1
values: B000 = Skipped, B001 = x1, B010 = x2, B011 = x4, B100 = x8, B101/other = x16
* Mode: uint8_t, default = Normal
values: Sleep = B00, Forced = B01 and B10, Normal = B11
* Standby Time (st): uint8_t, default = 1000ms
values: B000 = 0.5ms, B001 = 62.5ms, B010 = 125ms, B011 = 250ms, B100 = 250ms, B101 = 1000ms, B110 = 10ms, B111 = 20ms
* Filter: uint8_t, default = None
values: B000 = off, B001 = 2, B010 = 4, B011 = 8, B100/other = 16
* SPI Enable: bool, default = false
values: true = enable, false = disable
* BME280 Address: uint8_t, default = 0x76
values: any uint8_t
#### bool begin()
Method used at start up to initialize the class. Starts the I2C interface.
Return: bool, true = success, false = failure (no device found)
#### void setMode(uint8_t mode)
Method to set the sensor mode. Sleep = B00, Forced = B01 and B10, Normal = B11. Set to B01 to trigger a new measurement when using forced mode.
#### float temp(bool celsius = true)
Read the temperature from the BME280 and return a float.
Return: float = temperature
* Celsius: bool, default = true
values: true = return temperature in degrees Celsius, false = return
temperature in degrees Fahrenheit
#### float pres(uint8_t unit = 0x0)
Read the pressure from the BME280 and return a float with the specified unit.
Return: float = pressure
* Unit: uint8_t, default = 0x0
values: B000 = Pa, B001 = hPa, B010 = Hg, B011 = atm, B100 = bar,
B101 = torr, B110 = N/m^2, B111 = psi
#### float hum()
Read the humidity from the BME280 and return a percentage as a float.
Return: float = percent relative humidity
#### void data(float& pressure, float& temp, float& humidity, bool metric = true, uint8_t p_unit = 0x0)
Read the data from the BME280 with the specified units.
Return: None, however, pressure, temp and humidity are changed.
* Pressure: float, reference
values: reference to storage float for pressure
* Temperature: float, reference
values: reference to storage float for temperature
* Humidity: float, reference
values: reference to storage float for humidity
* Metric: bool, default = true
values: true = meters, false = feet
* Pressure Unit: uint8_t, default = 0x0
values: B000 = Pa, B001 = hPa, B010 = Hg, B011 = atm, B100 = bar,
B101 = torr, B110 = N/m^2, B111 = psi
#### float alt(bool metric = true, float seaLevelPressure = 101325)
Read the data from the BME280 with the specified units and then calculate the altitude.
Return: float = altitude
* Metric: bool, default = true
values: true = meters, false = feet
* Sea Level Pressure: float, unit = Pa, default = 101325
values: any float
#### float alt(float pressure, bool metric = true, float seaLevelPressure = 101325)
Calculate the altitude based on the pressure with the specified units.
Return: float = altitude
* Pressure: float, unit = Pa
values: any float
* Metric: bool, default = true
values: true = meters, false = feet
* Sea Level Pressure: float, unit = Pa, default = 101325
values: any float
#### float dew(bool metric = true)
Read BME280 data and calculate the dew point with the specified units.
Return: float = dew point
* Metric: bool, default = true
values: true = return temperature in degrees Celsius, false = return
temperature in degrees Fahrenheit
#### float dew(float temp, float hum, bool metric = true)
Calculate the dew point based on the temperature and humidity with the specified units.
Return: float = dew point
* Temperature: float, unit = Celsius if metric is true, Fahrenheit if metric is false
values: any float
* Humidity: float, unit = % relative humidity
values: any float
* Metric: bool, default = true
values: true = return degrees Celsius, false = return degrees Fahrenheit
## Contributing
1. Fork the project.
2. Create your feature branch: `git checkout -b my-new-feature`
3. Commit your changes: `git commit -am 'Add some feature'`
4. Push to the branch: `git push origin my-new-feature`
5. Submit a pull request.
## History
Jan 1, 2016 - Version 1.0.0 released.
Sep 19, 2016 - Version 2.0.0 released (support for I2C and SPI).
## Credits
Written by Tyler Glenn, 2016.
Special thanks to Mike Glenn for editing and reviewing the code.
## License
GNU GPL, see License.txt
</content>
</snippet>

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/*
BME280I2C Modes.ino
This code shows how to use predefined recommended settings from Bosch for
the BME280I2C environmental sensor.
This file is an example file, part of the Arduino BME280I2C library.
Copyright (C) 2016 Tyler Glenn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written: Dec 30 2015.
Last Updated: Jan 1 2016.
*/
/* ==== Includes ==== */
#include <BME280I2C.h>
#include <Wire.h> // Needed for legacy versions of Arduino.
/* ==== END Includes ==== */
/* ==== Defines ==== */
#define SERIAL_BAUD 115200
/* ==== END Defines ==== */
/* ==== Global Variables ==== */
BME280I2C bme; // Default : forced mode, standby time = 1000 ms
// pressure ×1, temperature ×1, humidity ×1, filter off
/* Based on Bosch BME280I2C environmental sensor data sheet. */
//BME280I2C bme; // Weather Monitoring : forced mode, 1 sample/minute
// pressure ×1, temperature ×1, humidity ×1, filter off
// Current Consumption = 0.16 μA
// RMS Noise = 3.3 Pa/30 cm, 0.07 %RH
// Data Output Rate 1/60 Hz
//BME280I2C bme(0, 1, 1); // Humidity Sensing : forced mode, 1 sample/second
// pressure ×0, temperature ×1, humidity ×1, filter off
// Current Consumption = 2.9 μA
// RMS Noise = 0.07 %RH
// Data Output Rate = 1 Hz
//BME280I2C bme(5, 2, 1, 1, 0, 4); // Indoor Navigation : normal mode, standby time = 0.5ms
// pressure ×16, temperature ×2, humidity ×1, filter = x16
// Current Consumption = 633 μA
// RMS Noise = 0.2 Pa/1.7 cm
// Data Output Rate = 25Hz
// Filter Bandwidth = 0.53 Hz
// Response Time (75%) = 0.9 s
//BME280I2C bme(3, 1, 0, 1, 0, 4); // Gaming : normal mode, standby time = 0.5ms
// pressure ×4, temperature ×1, humidity ×0, filter = x16
// Current Consumption = 581 μA
// RMS Noise = 0.3 Pa/2.5 cm
// Data Output Rate = 83 Hz
// Filter Bandwidth = 1.75 Hz
// Response Time (75%) = 0.3 s
bool metric = false;
/* ==== END Global Variables ==== */
/* ==== Prototypes ==== */
/* === Print a message to stream with the temp, humidity and pressure. === */
void printBME280Data(Stream * client);
/* === Print a message to stream with the altitude, dew point and. === */
void printBME280CalculatedData(Stream* client);
/* ==== END Prototypes ==== */
void setup() {
Serial.begin(SERIAL_BAUD);
while(!Serial) {} // Wait
while(!bme.begin()){
Serial.println("Could not find BME280I2C sensor!");
delay(1000);
}
}
void loop() {
printBME280Data(&Serial);
printBME280CalculatedData(&Serial);
delay(500);
}
void printBME280Data(Stream* client){
float temp(NAN), hum(NAN), pres(NAN);
uint8_t pressureUnit(3); // unit: B000 = Pa, B001 = hPa, B010 = Hg, B011 = atm, B100 = bar, B101 = torr, B110 = N/m^2, B111 = psi
bme.ReadData(pres, temp, hum, pressureUnit, metric); // Parameters: (float& pressure, float& temp, float& humidity, bool hPa = true, bool celsius = false)
/* Alternatives to ReadData():
float ReadTemperature(bool celsius = false);
float ReadPressure(uint8_t unit = 0);
float ReadHumidity();
Keep in mind the temperature is used for humidity and
pressure calculations. So it is more effcient to read
temperature, humidity and pressure all together.
*/
client->print("Temp: ");
client->print(temp);
client->print("°"+ String(metric ? 'C' :'F'));
client->print("\t\tHumidity: ");
client->print(hum);
client->print("% RH");
client->print("\t\tPressure: ");
client->print(pres);
client->print(" atm");
}
void printBME280CalculatedData(Stream* client){
float altitude = bme.CalculateAltitude(metric);
client->print("\t\tAltitude: ");
client->print(altitude);
client->print((metric ? "m" : "ft"));
client->println();
}

111
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/*
BME280 I2C Test.ino
This code shows how to record data from the BME280 environmental sensor
using I2C interface. This file is an example file, part of the Arduino
BME280 library.
Copyright (C) 2016 Tyler Glenn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Written: Dec 30 2015.
Last Updated: Sep 19 2016.
Connecting the BME280 Sensor:
Sensor -> Board
-----------------------------
Vin (Voltage In) -> 3.3V
Gnd (Ground) -> Gnd
SDA (Serial Data) -> A4 on Uno/Pro-Mini, 20 on Mega2560/Due, 2 Leonardo/Pro-Micro
SCK (Serial Clock) -> A5 on Uno/Pro-Mini, 21 on Mega2560/Due, 3 Leonardo/Pro-Micro
*/
/* ==== Includes ==== */
#include <BME280I2C.h>
#include <Wire.h> // Needed for legacy versions of Arduino.
/* ==== END Includes ==== */
/* ==== Defines ==== */
#define SERIAL_BAUD 115200
/* ==== END Defines ==== */
/* ==== Global Variables ==== */
BME280I2C bme; // Default : forced mode, standby time = 1000 ms
// Oversampling = pressure ×1, temperature ×1, humidity ×1, filter off,
bool metric = false;
/* ==== END Global Variables ==== */
/* ==== Prototypes ==== */
/* === Print a message to stream with the temp, humidity and pressure. === */
void printBME280Data(Stream * client);
/* === Print a message to stream with the altitude, and dew point. === */
void printBME280CalculatedData(Stream* client);
/* ==== END Prototypes ==== */
/* ==== Setup ==== */
void setup() {
Serial.begin(SERIAL_BAUD);
while(!Serial) {} // Wait
while(!bme.begin()){
Serial.println("Could not find BME280 sensor!");
delay(1000);
}
}
/* ==== END Setup ==== */
/* ==== Loop ==== */
void loop() {
printBME280Data(&Serial);
printBME280CalculatedData(&Serial);
delay(500);
}
/* ==== End Loop ==== */
/* ==== Functions ==== */
void printBME280Data(Stream* client){
float temp(NAN), hum(NAN), pres(NAN);
uint8_t pressureUnit(3); // unit: B000 = Pa, B001 = hPa, B010 = Hg, B011 = atm, B100 = bar, B101 = torr, B110 = N/m^2, B111 = psi
bme.read(pres, temp, hum, metric, pressureUnit); // Parameters: (float& pressure, float& temp, float& humidity, bool celsius = false, uint8_t pressureUnit = 0x0)
/* Alternatives to ReadData():
float temp(bool celsius = false);
float pres(uint8_t unit = 0);
float hum();
Keep in mind the temperature is used for humidity and
pressure calculations. So it is more effcient to read
temperature, humidity and pressure all together.
*/
client->print("Temp: ");
client->print(temp);
client->print("°"+ String(metric ? 'C' :'F'));
client->print("\t\tHumidity: ");
client->print(hum);
client->print("% RH");
client->print("\t\tPressure: ");
client->print(pres);
client->print(" atm");
}
void printBME280CalculatedData(Stream* client){
float altitude = bme.alt(metric);
float dewPoint = bme.dew(metric);
client->print("\t\tAltitude: ");
client->print(altitude);
client->print((metric ? "m" : "ft"));
client->print("\t\tDew point: ");
client->print(dewPoint);
client->println("°"+ String(metric ? 'C' :'F'));
}
/* ==== END Functions ==== */

8
lib/BME280/keywords.txt Normal file
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@ -0,0 +1,8 @@
BME280 KEYWORD1
begin KEYWORD2
temp KEYWORD2
pres KEYWORD2
hum KEYWORD2
data KEYWORD2
alt KEYWORD2
dew KEYWORD2
Side by side

After

Width:  |  Height:  |  Size: 114 B

9
lib/BME280/library.properties Normal file
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@ -0,0 +1,9 @@
name=BME280
version=2.0.01
author=Tyler Glenn <protglenn@gmail.com>
maintainer=Tyler Glenn <protglenn@gmail.com>
sentence=Provides a library for reading and interpreting Bosch BME280 environmental sensor data over I2C.
paragraph=Reads temperature, humidity, and pressure. Calculates altitude and dew point. Provides functions for english and metric. Also reads pressure in Pa, hPa, inHg, atm, bar, torr, N/m^2 and psi.
category=Sensors
url=https://www.github.com/finitespace/BME280
architectures=*

24
mobile-sensebox.ino
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@ -1,4 +1,5 @@
#include "lib/TinyGPS++/TinyGPS++.h"
#include "lib/BME280/BME280I2C.h"
#include "config.h"
#include "gps.h"
#include "wifi.h"
@ -15,6 +16,8 @@ TelnetPrint telnet = TelnetPrint();
OsemApi api = OsemApi();
Gps gps = Gps();
BME280I2C bme(1, 1, 1, 3, 5, 0, false, 0x77);
unsigned long cycleStart;
WifiState wifiState; // global, as both measure and upload need the state
TinyGPSLocation location;
@ -30,7 +33,8 @@ bool storeMeasurement(float lat, float lng, float value, const char* timeStamp,
}
void measure(WifiState& wifiState, TinyGPSLocation& loc) {
char dateString[20];
char dateString[22];
float temperature, humid, pressure;
// measure WiFi
wifiState = wifi.scan(WIFI_SSID);
@ -46,11 +50,16 @@ void measure(WifiState& wifiState, TinyGPSLocation& loc) {
loc = gps.getLocation();
gps.getISODate(dateString);
bme.read(pressure, temperature, humid, 1, true);
// print state
DEBUG_OUT << "homeAvailable: " << wifiState.homeAvailable << EOL;
DEBUG_OUT << "numAPs: " << wifiState.numAccessPoints << EOL;
DEBUG_OUT << "numNetworks: " << wifiState.numNetworks << EOL;
DEBUG_OUT << "numUnencrypted: " << wifiState.numUnencrypted << EOL;
DEBUG_OUT << "temperature: " << temperature << EOL;
DEBUG_OUT << "pressure: " << pressure << EOL;
DEBUG_OUT.print("lat: ");
DEBUG_OUT.print(loc.lat(), 8);
DEBUG_OUT.print(" lng: ");
@ -69,6 +78,12 @@ void measure(WifiState& wifiState, TinyGPSLocation& loc) {
if (!storeMeasurement(loc.lat(), loc.lng(), wifiState.numUnencrypted, dateString, ID_SENSOR_WIFI_OPEN))
DEBUG_OUT << "measurement (wifi open) store failed!" << EOL;
if (!storeMeasurement(loc.lat(), loc.lng(), temperature, dateString, ID_SENSOR_TEMP))
DEBUG_OUT << "measurement (temperature) store failed!" << EOL;
if (!storeMeasurement(loc.lat(), loc.lng(), pressure, dateString, ID_SENSOR_PRESSURE))
DEBUG_OUT << "measurement (pressure) store failed!" << EOL;
DEBUG_OUT << EOL;
}
@ -142,7 +157,7 @@ void adaptiveDelay(unsigned long ms, TinyGPSLocation& lastLoc, unsigned long off
/* MAIN ENTRY POINTS */
void setup() {
pinMode(BUILTIN_LED, OUTPUT); // status indicator LED: on = no GPS fix
pinMode(BUILTIN_LED, OUTPUT); // status indicator LED: on = no GPS fix
digitalWrite(BUILTIN_LED, LOW);
pinMode(PIN_MEASURE_MODE, INPUT_PULLUP); // switch for measurements (pull it down to disable)
pinMode(PIN_UPLOAD_MODE, INPUT_PULLUP); // switch for API uploads (pull it down to disable)
@ -152,6 +167,11 @@ void setup() {
wifi.begin(WIFI_SSID, WIFI_PASS);
DEBUG_OUT.begin(115200);
while(!bme.begin(D14, D15)){
adaptiveDelay(1000, location);
DEBUG_OUT.println("Could not find BME280I2C sensor!");
}
// wait until we got a first fix from GPS, and thus an initial time
// exception: measure mode is disabled (for quick upload only)
if (digitalRead(PIN_MEASURE_MODE) == HIGH) {