example4_BME280_temp_rh_compensation_with_BME280.ino

/* example4_BME280_temp_rh_compensation_with_BME280.ino

 This example shows how to give the ENS160 Temperature and Relative Humidity
 Data for compensation with the BME280. Note that the values that are given for compensation are not
 populated in their registers until the Air Quality Sensor is set to "Standard" operation
 and when data is ready (i.e. the data ready bit is set). Also note that there will be some 
 rounding of the temperature and relative humidity values when they're given to the sensor
 and again when they're read back. 

 Please note that for compensation values the datasheet specifies that they can be written
 at any time. 

 Modified by:
  Ho Yun "Bobby" Chan @ SparkFun Electronics August, 2023
 Written by: 
	Elias Santistevan @ SparkFun Electronics October, 2022

 Products: 
  Air Quality Sensor  (ENS160)             -  https://www.sparkfun.com/products/20844
  Humidity and Temperature Sensor (BME280) -  https://www.sparkfun.com/products/13676 
  
 Repository:
	https://github.com/sparkfun/SparkFun_Indoor_Air_Quality_Sensor-ENS160_Arduino_Library

 SparkFun code, firmware, and software is released under the MIT
 License(http://opensource.org/licenses/MIT).

*/

#include <Wire.h>
#include "SparkFun_ENS160.h"// Click here to get the library: http://librarymanager/All#SparkFun_ENS160
#include "SparkFunBME280.h" // Click here to get the library: http://librarymanager/All#SparkFun_BME280

SparkFun_ENS160 myENS;
BME280 myBME280;

bool printedCompensation = false;
int ensStatus;

float rh;
float tempC;



void setup() {
  Wire.begin();

  Serial.begin(115200);

  if (!myENS.begin()) {
    Serial.println("Air Quality Sensor did not begin.");
    while (1)
      ;
  }

  if (myBME280.beginI2C() == false)  //Begin communication over I2C
  {
    Serial.println("The sensor did not respond. Please check wiring.");
    while (1)
      ;  //Freeze
  }

  rh = myBME280.readFloatHumidity();
  tempC = myBME280.readTempC();
  Serial.print("Relative Humidity (%): ");
  Serial.println(rh);
  Serial.print("Temperature (Celsius): ");
  Serial.println(tempC);

  // Reset the indoor air quality sensor's settings.
  if (myENS.setOperatingMode(SFE_ENS160_RESET))
    Serial.println("Ready.");

  delay(100);

  // Give values to Air Quality Sensor.
  myENS.setTempCompensationCelsius(tempC);
  myENS.setRHCompensationFloat(rh);

  delay(500);

  // Set to standard operation
  // Others include SFE_ENS160_DEEP_SLEEP and SFE_ENS160_IDLE
  myENS.setOperatingMode(SFE_ENS160_STANDARD);

  // There are four values here:
  // 0 - Operating ok: Standard Opepration
  // 1 - Warm-up: occurs for 3 minutes after power-on.
  // 2 - Initial Start-up: Occurs for the first hour of operation.
  //												and only once in sensor's lifetime.
  // 3 - No Valid Output
  ensStatus = myENS.getFlags();
  Serial.print("Gas Sensor Status Flag: ");
  Serial.println(ensStatus);
}

void loop() {
  if (myENS.checkDataStatus()) {

    if (printedCompensation == false) {
      Serial.println("---------------------------");
      Serial.print("Compensation Relative Humidity (%): ");
      Serial.println(myENS.getRH());
      Serial.println("---------------------------");
      Serial.print("Compensation Temperature (Celsius): ");
      Serial.println(myENS.getTempCelsius());
      Serial.println("---------------------------");
      printedCompensation = true;
      delay(500);
    }

    Serial.print("Air Quality Index (1-5) : ");
    Serial.println(myENS.getAQI());

    Serial.print("Total Volatile Organic Compounds: ");
    Serial.print(myENS.getTVOC());
    Serial.println("ppb");

    Serial.print("CO2 concentration: ");
    Serial.print(myENS.getECO2());
    Serial.println("ppm");

    Serial.println();
  }

  delay(200);
}