Grove : capteur de qualitÃ© de l'air

De Wikidebrouillard.

Article incomplet en cours de rédaction

Sommaire

1 Introduction
2 Features
3 Cautions
4 Usage
5 Resources
6 Support
7 Crédits

Introduction

This sensor is designed for comprehensive monitor over indoor air condition.

It's responsive to a wide scope of harmful gases, as carbon monixide, alcohol, acetone, thinner, formaldehyde and so on. Due to the measuring mechanism, this sensor can not output specific data to describe target gases' concentrations quantitatively. But it's still competent enough to be used in applications that require only qualitative results, like auto refresher sprayers and auto air cycling systems.

Features

Responsive to a wide scope of target gases
Cost efficient
Durable

Cautions

Require relatively clean air as an initial condition.
Long time exposure to highly polluted air can significantly weaken its sensitivity.
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Usage

As described in Introduction, this sensor does better in providing qualitative results over a wide scope of target gases. In this demo, we difine 4 statuses for reference in the .cpp file. They are:

a. air fresh -- indicating a good air condition

b. low pollution -- indicating a rather low concentration of target gases exist.

c. high pollution(without "Force signal active" messeage printed on serial monitor) -- you should be aware of the pollution level and think if some measures should be taken.

d. high pollution(with "Force signal active" messeage printed on serial monitor) -- instant measures should be taken to improve the air quality.

We encapsulated the judge structure in .cpp file. You can find your way to modify the threholds in it.

Let's start to try it out!

1. Connect the Sensor to A0 port of Grove - Base Shield.

2. Download the File :AirQuality_Sensor Library.

3. Wait 2 min for heat-up of the sensor. Then open the example below by the path:File -> Example ->AirQuality_Sensor->AirQuality_Sensor.

/*
AirQuality Demo V1.0.
connect to A1 to start testing. it will needs about 20s to start
* By: http://www.seeedstudio.com
*/
#include "AirQuality.h"
#include "Arduino.h"
AirQuality airqualitysensor;
int current_quality =-1;
void setup()
{
Serial.begin(9600);
airqualitysensor.init(14);
}
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");
else if (current_quality==1)
Serial.println("High pollution!");
else if (current_quality==2)
Serial.println("Low pollution!");
else if (current_quality ==3)
Serial.println("Fresh air");
}
}
ISR(TIMER2_OVF_vect)
{
if(airqualitysensor.counter==122)//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++;
}
}

4. Upload the code. Please click here if you do not know how to upload it.
5. Open serial monitor.

To adjust the threholds and indicating messeages, refer the judge structure below in .cpp file.

 int AirQuality::slope(void)
{
while(timer_index)
{
if(first_vol-last_vol>400||first_vol>700)
{
Serial.println("High pollution! Force signal active."); 
timer_index=0; 
avg_voltage(); 
return 0; 

}
else if((first_vol-last_vol>400&&first_vol<700)||first_vol-vol_standard>150)
{ 
Serial.print("sensor_value:"); 
Serial.print(first_vol); 
Serial.println("\t High pollution!"); 
timer_index=0; 
avg_voltage();
return 1;

}
else if((first_vol-last_vol>200&&first_vol<700)||first_vol-vol_standard>50)
{
//Serial.println(first_vol-last_vol);
Serial.print("sensor_value:");
Serial.print(first_vol); 
Serial.println("\t Low pollution!"); 
timer_index=0;
avg_voltage();
return 2; 
}
else
{
avg_voltage(); 
Serial.print("sensor_value:");
Serial.print(first_vol);
Serial.println("\t Air fresh");
timer_index=0;
return 3;
}
}
return -1;
}