Example Code for Arduino - Read VOC Index

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• SGP40 Air Quality Sensor x1
• Jumper wires

Software Preparation

• Arduino IDE
• Download and install the SGP40 Library. (About how to install the library?)

Wiring Diagram

Other Preparation Work

The product uses standard I2C wiring, which very easy to use. Connect the sensor with a main-board(UNO or others).

The sensor will output more accurate and stable VOC index data after using for 5 minutes.

Sample Code

/*!
 * @file getVocIndex.ino
 * @brief Read the environmental VOC index.  Range: 0-500;\n * @n Experimental phenomena: read environmental VOC index once per second and print the value in serial port
 *
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [yangfeng]<[email protected]>
 * @version  V1.0
 * @date  2020-12-18
 * @get from https://www.dfrobot.com
 * @url  https://github.com/DFRobot/DFRobot_SGP40
 */
#include <DFRobot_SGP40.h>

/* 
 * Method 1: pass in the specified I2C object address 
 * #include <Wire.h>
 * DFRobot_SGP40    mySgp40(&Wire);
 
 * Method 2: use the default I2C object&Wire
 * I2C Default Address：0x59
 */

//#include <Wire.h>
//DFRobot_SGP40    mySgp40(&Wire);
DFRobot_SGP40    mySgp40;


void setup() {
  Serial.begin(115200);
  Serial.println("sgp40 is starting, the reading can be taken after 10 seconds...");
  /*
   * Sensor preheat time: 10s
   * duration: init wait time. Unit: ms. It is suggested: duration>=10000ms
   */
  while(mySgp40.begin(/*duration = */10000) !=true){
    Serial.println("failed to init chip, please check if the chip connection is fine");
    delay(1000);
  }
  Serial.println("----------------------------------------------");
  Serial.println("sgp40 initialized successfully!");
  Serial.println("----------------------------------------------");
  /* 
   * Set the relative humidity and temperature of current environment 
   * The sensor has internal temerpature & humidity calibration. For more accurate VOC index, please open the function setRhT().
   * relativeHumidity：ambient relative humidity, refer to the moisture content in air. Range：0-90, unit: %RH，e.g. 50%
   * temperatureC：ambient temperature. Range: -10~50, unit: °C, e.g. 20°C
   */
  //mySgp40.setRhT(/*relativeHumidity = */ 50, /*temperatureC = */ 20);
  
}

void loop() {
  /* 
   * Get VOC index 
   * VOC index can directly indicate the condition of air quality. The larger the value, the worse the air quality
   *    0-100，no need to ventilate,purify
   *    100-200，no need to ventilate,purify
   *    200-400，ventilate,purify
   *    400-500，ventilate,purify intensely
   * Return VOC index, range: 0-500
   */
  uint16_t index = mySgp40.getVoclndex();
  
  Serial.print("vocIndex = ");
  Serial.println(index);
  delay(1000);
}

Result