What Is The Air Quality Inside Your Room

Introduction

In this simple tutorial today, we shall see how to measure the air quality inside your room using the Grove SGP30 sensor

Video

Hardware Preparation

This is the list of items used in the video.

Building The Circuit

1. Constructing the circuit is very straight forward since both the sensor and the lcd use the Grove i2C type connection. Hence the circuit can be constructed as shown in the image below

Once the connection are made as per the figure above, we can now start to code.

Code

For the code, i have used the sample code and make few modification to it.

#include
#include "sensirion_common.h"
#include "sgp30.h"
#include
#include "rgb_lcd.h"

rgb_lcd lcd;

void setup() {
    s16 err;
    u32 ah = 0;
    u16 scaled_ethanol_signal, scaled_h2_signal;
    Serial.begin(115200);
    Serial.println("serial start!!");
    lcd.begin(16, 2);
    lcd.clear();
    delay(1000);

    /*For wio link!*/
    #if defined(ESP8266)
    pinMode(15, OUTPUT);
    digitalWrite(15, 1);
    Serial.println("Set wio link power!");
    delay(500);
    #endif
    /*  Init module,Reset all baseline,The initialization takes up to around 15 seconds, during which
        all APIs measuring IAQ(Indoor air quality ) output will not change.Default value is 400(ppm) for co2,0(ppb) for tvoc*/
    while (sgp_probe() != STATUS_OK) {
        Serial.println("SGP failed");
        while (1);
    }
    /*Read H2 and Ethanol signal in the way of blocking*/
    err = sgp_measure_signals_blocking_read(&scaled_ethanol_signal,
                                            &scaled_h2_signal);
    if (err == STATUS_OK) {
        Serial.println("get ram signal!");
    } else {
        Serial.println("error reading signals");
    }

    //ah=get_relative_humidity();
    /*
        The function sgp_set_absolute_humidity() need your own implementation
    */
    //sgp_set_absolute_humidity(ah);

    // Set absolute humidity to 13.000 g/m^3
    //It's just a test value
    sgp_set_absolute_humidity(13000);
    err = sgp_iaq_init();
    //
}

void loop() {
    s16 err = 0;
    u16 tvoc_ppb, co2_eq_ppm;
    err = sgp_measure_iaq_blocking_read(&tvoc_ppb, &co2_eq_ppm);
    if (err == STATUS_OK) {
        Serial.print("tVOC  Concentration:");
        Serial.print(tvoc_ppb);
        Serial.println("ppb");
        lcd.setCursor(0, 0);
        lcd.print("tVOC :");
        lcd.setCursor(6, 0);
        lcd.print(tvoc_ppb);
        lcd.setCursor(9, 0);
        lcd.print("ppb");

        Serial.print("CO2eq Concentration:");
        Serial.print(co2_eq_ppm);
        Serial.println("ppm");
        lcd.setCursor(0, 1);
        lcd.print("CO2eq:");
        lcd.setCursor(6, 1);
        lcd.print(co2_eq_ppm);
        lcd.setCursor(11, 1);
        lcd.print("ppm");
    } else {
        Serial.println("error reading IAQ values\n");
    }
    delay(1000);
}

Outcome

Thank You

Thanks for reading this tutorial. If you have any technical inquiries, please post at Cytron Technical Forum.

"Please be reminded, this tutorial is prepared for you to try and learn.
You are encouraged to improve the code for a better application."