[Mega] 零知开源分享-使用SGP30模块进行空气质量监测

/*

*        空气质量：VOC,CO2测量

*         零知开源-www.lingzhilab.com

*/

  

#include "Adafruit_SGP30.h"

  

Adafruit_SGP30 sgp;

  

/* return absolute humidity [mg/m^3] with approximation formula

* @param temperature [°C]

* @param humidity [%RH]

*/

uint32_t getAbsoluteHumidity(float temperature, float humidity) {

    // approximation formula from Sensirion SGP30 Driver Integration chapter 3.15

    const float absoluteHumidity = 216.7f * ((humidity / 100.0f) * 6.112f * exp((17.62f * temperature) / (243.12f + temperature)) / (273.15f + temperature)); // [g/m^3]

    const uint32_t absoluteHumidityScaled = static_cast<uint32_t>(1000.0f * absoluteHumidity); // [mg/m^3]

    return absoluteHumidityScaled;

}

  

void setup() {

  Serial.begin(9600);

  Serial.println("SGP30 test");

  

  if (! sgp.begin()){

    Serial.println("Sensor not found :(");

    while (1);

  }

  Serial.print("Found SGP30 serial #");

  Serial.print(sgp.serialnumber[0], HEX);

  Serial.print(sgp.serialnumber[1], HEX);

  Serial.println(sgp.serialnumber[2], HEX);

  

  // If you have a baseline measurement from before you can assign it to start, to 'self-calibrate'

  //sgp.setIAQBaseline(0x8E68, 0x8F41);  // Will vary for each sensor!

}

  

int counter = 0;

void loop() {

  // If you have a temperature / humidity sensor, you can set the absolute humidity to enable the humditiy compensation for the air quality signals

  //float temperature = 22.1; // [°C]

  //float humidity = 45.2; // [%RH]

  //sgp.setHumidity(getAbsoluteHumidity(temperature, humidity));

  

  if (! sgp.IAQmeasure()) {

    Serial.println("Measurement failed");

    return;

  }

  Serial.print("TVOC "); Serial.print(sgp.TVOC); Serial.print(" ppb\t");

  Serial.print("eCO2 "); Serial.print(sgp.eCO2); Serial.println(" ppm");

  delay(1000);

  

  counter++;

  if (counter == 30) {

    counter = 0;

  

    uint16_t TVOC_base, eCO2_base;

    if (! sgp.getIAQBaseline(&eCO2_base, &TVOC_base)) {

      Serial.println("Failed to get baseline readings");

      return;

    }

    Serial.print("****Baseline values: eCO2: 0x"); Serial.print(eCO2_base, HEX);

    Serial.print(" & TVOC: 0x"); Serial.println(TVOC_base, HEX);

  }

}