Air qualitiy sensor v1.3 with alarm

Products & Technology Grove
#1

Hi!

I changed a little bit the code of AQ-Sensor with a piezo sum and LED for quality.



/*

AirQuality Demo V1.0.

connect to A0 to start testing. it will needs about 20s to start

  • By: http://www.seeedstudio.com

    */

    #include"AirQuality.h"

    #include"Arduino.h"

    AirQuality airqualitysensor;

    int Tast = 2;

    #define LED 13

    const int Sum = 3;

    #define Red 5

    #define Yellow 6

    #define Green 7

    int current_quality =-1;

    void setup()

    {

    Serial.begin(9600);

    airqualitysensor.init(14);

    pinMode(Tast, INPUT_PULLUP);

    pinMode(LED, OUTPUT);

    pinMode(Sum, OUTPUT);

    pinMode(Red, OUTPUT);

    pinMode(Yellow, OUTPUT);

    pinMode(Green, OUTPUT);

    digitalWrite(LED, LOW);

    digitalWrite (Sum, LOW);

    digitalWrite (Red, LOW);

    digitalWrite (Yellow, LOW);

    digitalWrite (Green, LOW);



    }

    void loop()

    {

    current_quality=airqualitysensor.slope();

    if (current_quality >= 0)// if a valid data returned.

    {

    if (current_quality==0)

    {

    Serial.println(“High pollution! Force signal active”);

    digitalWrite(LED, LOW);

    digitalWrite (Green, LOW);

    digitalWrite (Yellow, LOW);

    tone (Sum, 2000);

    digitalWrite (Red, HIGH);

    }

    else if (current_quality==1)

    {

    Serial.println(“High pollution!”);

    digitalWrite(LED, LOW);

    digitalWrite(Green, LOW);

    digitalWrite(Yellow, LOW);

    noTone(Sum);

    digitalWrite(Red, HIGH);

    }

    else if (current_quality==2)

    {

    Serial.println(“Low pollution!”);

    digitalWrite(LED, LOW);

    digitalWrite(Green, LOW);

    digitalWrite(Red, LOW);

    noTone(Sum);

    digitalWrite(Yellow, HIGH);

    }

    else if (current_quality ==3)

    {

    Serial.println(“Fresh air”);

    digitalWrite(LED, LOW);

    digitalWrite(Red, LOW);

    digitalWrite(Yellow, LOW);

    noTone(Sum);

    digitalWrite(Green, HIGH);

    }

    }

    }

    ISR(TIMER1_OVF_vect)

    {

    if(airqualitysensor.counter==61)//set 2 seconds as a detected duty

    {



    airqualitysensor.last_vol=airqualitysensor.first_vol;

    airqualitysensor.first_vol=analogRead(A0);

    airqualitysensor.counter=0;

    airqualitysensor.timer_index=1;

    PORTB=PORTB^0x20;

    }

    else

    {

    airqualitysensor.counter++;

    }

    }



    *********

    Now, I would like to tunr off the piezo with Tast on Pin 2.

    It should do the following:
  • AQ = 0 and
  • Tast = 1

    then tone(Sum, 2000)


  • Tast = 0

    then noTone(Sum);



    and stay, until AQ > 0

    then it should reset the piezo until AQ = 0 again.



    I am not very good in programming - thanks for help!

    Peter
#2

Hi there:



*

AirQuality Demo V1.0.

connect to A0 to start testing. it will needs about 20s to start

  • By: http://www.seeedstudio.com

    /

    #include"AirQuality.h"

    #include"Arduino.h"

    AirQuality airqualitysensor;

    int Tast = 2;

    #define LED 13

    const int Sum = 3;

    #define Red 5

    #define Yellow 6

    #define Green 7

    int current_quality =-1;



    void setup()

    {

    Serial.begin(9600);

    airqualitysensor.init(14);

    pinMode(Tast, INPUT_PULLUP);

    pinMode(LED, OUTPUT);

    pinMode(Sum, OUTPUT);

    pinMode(Red, OUTPUT);

    pinMode(Yellow, OUTPUT);

    pinMode(Green, OUTPUT);





    digitalWrite(LED, LOW);

    digitalWrite (Sum, LOW);

    digitalWrite (Red, LOW);

    digitalWrite (Yellow, LOW);

    digitalWrite (Green, LOW);



    }

    void loop()

    {

    current_quality=airqualitysensor.slope();



    if (current_quality >= 0)// if a valid data returned.

    {

    if (current_quality==0)

    {

    Serial.println(“High pollution! Force signal active”);



    /     add coder :

    AQ = 0 and

    - Tast = 1

    /

    digitalWrite(Tast, HIGH);

    /    /



    digitalWrite(LED, LOW);

    digitalWrite (Green, LOW);

    digitalWrite (Yellow, LOW);

    tone (Sum, 2000);



    /     add coder : /

    digitalWrite(Tast, LOW);

    /    /



    digitalWrite (Red, HIGH);

    }

    else if (current_quality==1)

    {

    Serial.println(“High pollution!”);

    digitalWrite(LED, LOW);

    digitalWrite(Green, LOW);

    digitalWrite(Yellow, LOW);

    noTone(Sum);



    /     add /

    current_quality = 0;



    digitalWrite(Red, HIGH);

    }

    else if (current_quality==2)

    {

    Serial.println(“Low pollution!”);

    digitalWrite(LED, LOW);

    digitalWrite(Green, LOW);

    digitalWrite(Red, LOW);

    noTone(Sum);

    /     add /

    current_quality = 0;

    digitalWrite(Yellow, HIGH);

    }

    else if (current_quality ==3)

    {

    Serial.println(“Fresh air”);

    digitalWrite(LED, LOW);

    digitalWrite(Red, LOW);

    digitalWrite(Yellow, LOW);

    noTone(Sum);

    /     add */

    current_quality = 0;

    digitalWrite(Green, HIGH);

    }

    }

    }



    ISR(TIMER1_OVF_vect)

    {

    if(airqualitysensor.counter==61)//set 2 seconds as a detected duty

    {



    airqualitysensor.last_vol=airqualitysensor.first_vol;

    airqualitysensor.first_vol=analogRead(A0);

    airqualitysensor.counter=0;

    airqualitysensor.timer_index=1;

    PORTB=PORTB^0x20;

    }

    else

    {

    airqualitysensor.counter++;

    }

    }
#3

Hi There,

unfortunately I always get the error message: expected constructor, destructor, or type conversion before ‘(’ token. this message references the code line 101 ISR (TIMER1_OVF_vect).

What am I doing wrong?

Best Regards

Christoph

#4

Hi:

Could you please take a photo about your hardware? I have tested the code above, and get a right data.

Here is my .ino file<LINK_TEXT text=“https://github.com/SeeedDocument/forum_ … Sensor.ino”>https://github.com/SeeedDocument/forum_doc/raw/master/reg/Air_Quality_Sensor.ino</LINK_TEXT>, maybe you can download to have a test. When you test, please do not connect any other sensors, just connect Air Quality Sensor.

#5

Hello and thank you very much for your answer. Unfortunately, it still doesn’t work for me. Too bad, more information in the appendix. And I am very happy and grateful if you help me further. I use a board called ExpLoRer form Sodaq (https://shop.sodaq.com/explorer.html)

Best regards

Christoph
Unbenannt.JPG
IMG_20180809_185919.jpg

#6

Hi there,



ISR(TIMER1_OVF_vect) is run whenever the interrupt* “TIMER1_OVF_vect” is triggered. This is an interrupt that the ATmega328P * triggers whenever Timer 1 overflows past its maximum value.



I see you use the SAMD21 that’s the reason behind, it can’t be compiled successfully. You have to modify the library and code to make it work with SAMD21.



Bill