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Example2_BME280Compensation.ino (5403B)

      1 /******************************************************************************
      2   Compensating the CCS811 with humidity readings from the BME280
      3 
      4   Marshall Taylor @ SparkFun Electronics
      5 
      6   April 4, 2017
      7 
      8   https://github.com/sparkfun/CCS811_Air_Quality_Breakout
      9   https://github.com/sparkfun/SparkFun_CCS811_Arduino_Library
     10 
     11   This example uses a BME280 to gather environmental data that is then used
     12   to compensate the CCS811.
     13 
     14   Hardware Connections (Breakoutboard to Arduino):
     15   3.3V to 3.3V pin
     16   GND to GND pin
     17   SDA to A4
     18   SCL to A5
     19 
     20   Resources:
     21   Uses Wire.h for i2c operation
     22 
     23   Development environment specifics:
     24   Arduino IDE 1.8.1
     25 
     26   This code is released under the [MIT License](http://opensource.org/licenses/MIT).
     27 
     28   Please review the LICENSE.md file included with this example. If you have any questions
     29   or concerns with licensing, please contact techsupport@sparkfun.com.
     30 
     31   Distributed as-is; no warranty is given.
     32 ******************************************************************************/
     33 #include <Wire.h>
     34 #include <SparkFunBME280.h> //Click here to get the library: http://librarymanager/All#SparkFun_BME280
     35 #include <SparkFunCCS811.h> //Click here to get the library: http://librarymanager/All#SparkFun_CCS811
     36 
     37 #define CCS811_ADDR 0x5B //Default I2C Address
     38 //#define CCS811_ADDR 0x5A //Alternate I2C Address
     39 
     40 #define PIN_NOT_WAKE 5
     41 
     42 //Global sensor objects
     43 CCS811 myCCS811(CCS811_ADDR);
     44 BME280 myBME280;
     45 
     46 void setup()
     47 {
     48   Serial.begin(115200);
     49   Serial.println();
     50   Serial.println("Apply BME280 data to CCS811 for compensation.");
     51 
     52   Wire.begin();
     53 
     54   //This begins the CCS811 sensor and prints error status of .beginWithStatus()
     55   CCS811Core::CCS811_Status_e returnCode = myCCS811.beginWithStatus();
     56   Serial.print("CCS811 begin exited with: ");
     57   Serial.println(myCCS811.statusString(returnCode));
     58 
     59   //For I2C, enable the following and disable the SPI section
     60   myBME280.settings.commInterface = I2C_MODE;
     61   myBME280.settings.I2CAddress = 0x77;
     62 
     63   //Initialize BME280
     64   //For I2C, enable the following and disable the SPI section
     65   myBME280.settings.commInterface = I2C_MODE;
     66   myBME280.settings.I2CAddress = 0x77;
     67   myBME280.settings.runMode = 3; //Normal mode
     68   myBME280.settings.tStandby = 0;
     69   myBME280.settings.filter = 4;
     70   myBME280.settings.tempOverSample = 5;
     71   myBME280.settings.pressOverSample = 5;
     72   myBME280.settings.humidOverSample = 5;
     73 
     74   //Calling .begin() causes the settings to be loaded
     75   delay(10); //Make sure sensor had enough time to turn on. BME280 requires 2ms to start up.
     76   myBME280.begin();
     77 }
     78 //---------------------------------------------------------------
     79 void loop()
     80 {
     81   //Check to see if data is available
     82   if (myCCS811.dataAvailable())
     83   {
     84     //Calling this function updates the global tVOC and eCO2 variables
     85     myCCS811.readAlgorithmResults();
     86     //printInfoSerial fetches the values of tVOC and eCO2
     87     printInfoSerial();
     88 
     89     float BMEtempC = myBME280.readTempC();
     90     float BMEhumid = myBME280.readFloatHumidity();
     91 
     92     Serial.print("Applying new values (deg C, %): ");
     93     Serial.print(BMEtempC);
     94     Serial.print(",");
     95     Serial.println(BMEhumid);
     96     Serial.println();
     97 
     98     //This sends the temperature data to the CCS811
     99     myCCS811.setEnvironmentalData(BMEhumid, BMEtempC);
    100   }
    101   else if (myCCS811.checkForStatusError())
    102   {
    103     //If the CCS811 found an internal error, print it.
    104     printSensorError();
    105   }
    106 
    107   delay(2000); //Wait for next reading
    108 }
    109 
    110 //---------------------------------------------------------------
    111 void printInfoSerial()
    112 {
    113   //getCO2() gets the previously read data from the library
    114   Serial.println("CCS811 data:");
    115   Serial.print(" CO2 concentration : ");
    116   Serial.print(myCCS811.getCO2());
    117   Serial.println(" ppm");
    118 
    119   //getTVOC() gets the previously read data from the library
    120   Serial.print(" TVOC concentration : ");
    121   Serial.print(myCCS811.getTVOC());
    122   Serial.println(" ppb");
    123 
    124   Serial.println("BME280 data:");
    125   Serial.print(" Temperature: ");
    126   Serial.print(myBME280.readTempC(), 2);
    127   Serial.println(" degrees C");
    128 
    129   Serial.print(" Temperature: ");
    130   Serial.print(myBME280.readTempF(), 2);
    131   Serial.println(" degrees F");
    132 
    133   Serial.print(" Pressure: ");
    134   Serial.print(myBME280.readFloatPressure(), 2);
    135   Serial.println(" Pa");
    136 
    137   Serial.print(" Pressure: ");
    138   Serial.print((myBME280.readFloatPressure() * 0.0002953), 2);
    139   Serial.println(" InHg");
    140 
    141   Serial.print(" Altitude: ");
    142   Serial.print(myBME280.readFloatAltitudeMeters(), 2);
    143   Serial.println("m");
    144 
    145   Serial.print(" Altitude: ");
    146   Serial.print(myBME280.readFloatAltitudeFeet(), 2);
    147   Serial.println("ft");
    148 
    149   Serial.print(" %RH: ");
    150   Serial.print(myBME280.readFloatHumidity(), 2);
    151   Serial.println(" %");
    152 
    153   Serial.println();
    154 }
    155 
    156 //printSensorError gets, clears, then prints the errors
    157 //saved within the error register.
    158 void printSensorError()
    159 {
    160   uint8_t error = myCCS811.getErrorRegister();
    161 
    162   if (error == 0xFF) //comm error
    163   {
    164     Serial.println("Failed to get ERROR_ID register.");
    165   }
    166   else
    167   {
    168     Serial.print("Error: ");
    169     if (error & 1 << 5)
    170       Serial.print("HeaterSupply");
    171     if (error & 1 << 4)
    172       Serial.print("HeaterFault");
    173     if (error & 1 << 3)
    174       Serial.print("MaxResistance");
    175     if (error & 1 << 2)
    176       Serial.print("MeasModeInvalid");
    177     if (error & 1 << 1)
    178       Serial.print("ReadRegInvalid");
    179     if (error & 1 << 0)
    180       Serial.print("MsgInvalid");
    181     Serial.println();
    182   }
    183 }