SparkFun Indoor Air Quality Sensor - ENS160 (Qwiic) Hookup Guide

Example 2: Interrupts

Once the library is installed, go ahead and open up File->Examples->SparkFun Indoor Air Quality Sensor - ENS160->example2_interrupts. Make sure to select your board (SparkFun RedBoard) and COM port before hitting upload to begin experimenting with the air quality sensor.

Alternatively, you can copy and paste the code below into a nice new Arduino sketch:

language:c
/* example2_interrupts.ino

 This example shows how to configure interrupts for the SparkFun 
 Indoor Air Quality Sensor - ENS160.

 Written by: 
    Elias Santistevan @ SparkFun Electronics October, 2022

 Product: 
  https://www.sparkfun.com/products/20844

 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"

SparkFun_ENS160 myENS; 

int ensInt = 2; 
int ensStatus; 

void setup()
{
    pinMode(ensInt, INPUT_PULLUP);

    Wire.begin();

    Serial.begin(115200);

    if( !myENS.begin() )
    {
        Serial.println("Did not begin.");
        while(1);
    }

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

    delay(100);

    // Device needs to be set to idle to apply the following settings.
    myENS.setOperatingMode(SFE_ENS160_IDLE);

    //myENS.configureInterrupt(0x61); //If you want to do the following stuff but all at once.

    myENS.enableInterrupt();            // Enable physical interrupt.
    myENS.setDataInterrupt();           // Enable the data ready bit on the physical interrupt pin.
    //myENS.setInterruptPolarity(); // Changes interrupt from active low to active high.
    //myENS.setInterruptDrive();    //Changes interrupt from active low to push-pull.

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

    delay(100);


    // 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( digitalRead(ensInt) == LOW )
    {
        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");
    }

    delay(200);
}

Note that depending on which processor board you are using, you may need to alter the Interrupt Pin. Since we're using a RedBoard here, our Interrupt Pin is 2 (ensInt = 2). Also, in this example, we've soldered headers to our Air Quality Sensor so that we can use the interrupt pin. Your hardware hookup should look something like the following:

Once you've got your code uploaded, open up a Serial Monitor and check out your output. You should see something like the following: