Grove Air Quality Sensor v1.3 Issues

Other Hardware Sensors
1

[Relatively new to coding on Arduino and messing around with plugging in new components]

Hello, I am working on an air quality sensor project and I am having some trouble with the sensor values not seeming to change even if I blow smoke into them. What I am using is a Arduino Nano 33 BLE Sense board and a Grove Air Quality Sensor v1.3 directly plugged into it.

Here is my code:

#include "Air_Quality_Sensor.h"

AirQualitySensor sensor(A0);

void setup(void) {
    Serial.begin(9600);
    while (!Serial);

    Serial.println("Waiting for sensor to initialize...");
    delay(20000);

    if (sensor.init()) {
        Serial.println("Sensor ready.");
    } else {
        Serial.println("Sensor ERROR!");
    }
}

void loop(void) {
    int quality = sensor.slope();
    int sensorValue = sensor.getValue();

    Serial.print("Sensor value: ");
    Serial.println(sensorValue);

    if (quality == AirQualitySensor::FORCE_SIGNAL) {
        Serial.println("High pollution! Force signal active.");
    } else if (quality == AirQualitySensor::HIGH_POLLUTION) {
        Serial.println("High pollution!");
    } else if (quality == AirQualitySensor::LOW_POLLUTION) {
        Serial.println("Low pollution.");
    } else if (quality == AirQualitySensor::FRESH_AIR) {
        Serial.println("Fresh air.");
    }

    int aqi = map(sensorValue, 0, 1023, 0, 500); 
    Serial.print("AQI: ");
    Serial.println(aqi);

    delay(1000);
}

The output of the code has the sensorValue never going below or above 200 by 4 values. The range is always 197-204. I have never seen it be different, even when I put bug spray or smoke in front of the sensor.

Any help would be greatly appreciated.

2

Sorry, that doesn't convey any useful information, and a wiring error would explain your problem.

Please post a picture of hand drawn wiring diagram, with connections and pins clearly labeled.

3

20230808_165621
20230808_1656211920×2560 320 KB

Sorry, like I said, I am new to this. All I have is the air quality sensor and the Arduino board

4

That's the sensor it uses

Of particular note is the 300mW power consumption and the line that says "Warm-up time More than 48 hours".

It sounds like there is a 'bake off' process that takes many hours before the sensor gives sensible readings.

5

Your picture shows the
Arduino Nano 33 BLE Sense board and a **Grove Air Quality Sensor v1.3 (OV7675) **
both mounted on a blue base board which you havent mentioned. What is that?
And also another blue board with U2 on it?

6

Are you sure the yellow wire is connected to A0?

7

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