Example Code for Arduino-Get Baseline

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• CCS811 Air Quality Sensor x 1
• Jumper wires

Software Preparation

• Arduino IDE
• Download and install the CCS811 Library and examples. (About how to install the library?)

Wiring Diagram

Other Preparation Work

• Please run the sensor for 48hours when using it for the first time.
• Place the sensor in a fresh air environment for 20 minutes or more to obtain the baseline.

Sample Code

/*!
 * @file getBaseLine.ino
 * @brief Put the module in clear air and work a few minutes, wait for baseline doing not change 
 * @n Experiment phenomenon: get
 *
 * @copyright	Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [LuoYufeng]([email protected])
 * @version  V0.1
 * @date  2019-07-19
 * @get from https://www.dfrobot.com
 * @url https://github.com/DFRobot/DFRobot_CCS811
 */
#include "DFRobot_CCS811.h"


/*
 * IIC address default 0x5A, the address becomes 0x5B if the ADDR_SEL is soldered.
 */
//DFRobot_CCS811 CCS811(&Wire, /*IIC_ADDRESS=*/0x5A);
DFRobot_CCS811 CCS811;

void setup(void)
{
    Serial.begin(115200);
    /*Wait for the chip to be initialized completely, and then exit*/
    while(CCS811.begin() != 0){
        Serial.println("failed to init chip, please check if the chip connection is fine");
        delay(1000);
    }
}
void loop() {
    if(CCS811.checkDataReady() == true){
        /*!
         * @brief Set baseline
         * @return baseline in clear air
         */
        Serial.println(CCS811.readBaseLine(), HEX);
        
    } else {
        Serial.println("Data is not ready!");
    }
    //delay cannot be less than measurement cycle
    delay(1000);
}

Result

After a while, the baseline reaches to a stable value.

Additional Information

• During the first week of running the sensor, it is recommended to save a new baseline every 24 hours. After 1 week of operation, it can be saved every 1-28 days.
• Different sensors, different measurement cycles have different baselines.