Keep Your Home a Safe Place

An indoor air quality monitoring system with dust and air pollution sensors which operates a fan independently

Jul 28, 2021

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1954 views

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1 respects

air quality

clean air

dust

Components and supplies

Arduino Oplà IoT Kit

Axial Fan, 12 V

Grove - Dust Sensor（PPD42NS）

Grove - Air quality sensor v1.3

Project description

Code

c_cpp

1//#include"AirQuality.h"
2#include "thingProperties.h"
3#include   <Arduino_MKRIoTCarrier.h>
4MKRIoTCarrier carrier;
5
6//Colors
7uint32_t   noColor = carrier.leds.Color( 0, 0, 0); // no color
8uint32_t colorRed = carrier.leds.Color(0,   255, 0);   //RED
9uint32_t colorGreen = carrier.leds.Color(255, 0, 0);  //GREEN
10uint32_t   colorWhite = carrier.leds.Color( 255, 255, 255); // WHITE
11uint32_t colorYellow   = carrier.leds.Color( 255, 255, 0); // yellow
12uint32_t colorBlue = carrier.leds.Color(   0, 0, 255); // blue
13uint32_t colorPurple = carrier.leds.Color( 255, 0, 255);   // purple
14
15//int pir_movement = A4;
16int pir_movement_state = 0;
17
18int   pir_dust = A6;
19int air_quality_sensor = A5 ;
20
21
22unsigned long duration;
23unsigned   long start_time;
24unsigned long sample_time_ms = 3000;//sample 3s ;
25unsigned   long low_pulse_occupancy = 0;
26float ratio = 0;
27
28void setup() {
29  //   Initialize serial and wait for port to open:
30  Serial.begin(9600);
31 
32  //   Defined in thingProperties.h
33  initProperties();
34 
35  // Connect to Arduino   IoT Cloud
36  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
37  //Get Cloud   Info/errors , 0 (only errors) up to 4
38  setDebugMessageLevel(2);
39  ArduinoCloud.printDebugInfo();
40   
41  //Wait to get cloud connection to init the carrier
42  while (ArduinoCloud.connected()   != 1) {
43    ArduinoCloud.update();
44    delay(500);
45  }
46 
47  delay(500);
48   CARRIER_CASE = false;
49  carrier.begin();
50  carrier.display.setRotation(0);
51   delay(1000);
52  pinMode(A5, INPUT);
53  pinMode(A6, INPUT);
54  //pinMode(A4,   INPUT);
55  
56  start_time = millis();
57}
58
59void loop() {
60  ArduinoCloud.update();
61   carrier.Buttons.update();
62
63  temperature = carrier.Env.readTemperature();
64   humidity = carrier.Env.readHumidity();
65  Serial.print("Temperature: ");
66   Serial.print(temperature);
67  Serial.print(", Humidity: ");
68  Serial.println(humidity);
69   
70  
71  duration = pulseIn(pir_dust, LOW);
72  low_pulse_occupancy = low_pulse_occupancy   + duration;
73 
74  if ((millis()-start_time) > sample_time_ms)//if the sampel   time == 3s
75  {
76      // operations on the dust sensor
77      ratio = low_pulse_occupancy   / (sample_time_ms*10.0);  // Integer percentage 0=>100
78      concentration =   1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
79       Serial.print("concentration = ");
80      Serial.print(concentration);
81       Serial.println(" pcs/0.01cf  - ");
82      low_pulse_occupancy = 0;
83       start_time = millis();
84      
85      // operations on the air-pollution   sensor
86      current_quality = analogRead(air_quality_sensor);
87      if (current_quality   >= 1000){
88        Serial.println("Very High Pollution!");
89      }
90      else   if (current_quality >= 700){
91        Serial.println("High pollution!");
92       }
93      else if (current_quality >= 300){
94        Serial.println("Low   pollution!");
95      }
96      else{
97        Serial.println("Fresh air");
98       }
99      
100      if((concentration > 6000) || (current_quality >= 1000)){
101         carrier.display.fillScreen(ST77XX_BLACK); //black background
102        carrier.display.setTextColor(ST77XX_BLUE);   //blue text
103        carrier.display.setTextSize(3); //medium sized text
104        //sets   position for printing (x and y)
105        carrier.display.setCursor(45, 70);
106         carrier.display.println("HAZARD!");
107        carrier.leds.fill(colorBlue,   0, 5);
108        carrier.leds.show();
109        
110      }
111      
112      else   if((concentration > 4500 && concentration < 10000) || (current_quality <= 1000 &&   current_quality >= 700)){
113        carrier.display.fillScreen(ST77XX_BLACK); //black   background
114        carrier.display.setTextColor(ST77XX_RED); //red text
115        carrier.display.setTextSize(3);   //medium sized text
116        //sets position for printing (x and y)
117        carrier.display.setCursor(50,   70);
118        carrier.display.println("HEAVY");
119        carrier.leds.fill(colorRed,   0, 5);
120        carrier.leds.show();
121        
122      }
123      
124      else   if ((concentration > 3000 && concentration < 8000) || (current_quality <= 700 &&   current_quality >= 500)){
125        carrier.display.fillScreen(ST77XX_BLACK); //black   background
126        carrier.display.setTextColor(ST77XX_YELLOW); //yellow text
127         carrier.display.setTextSize(3); //medium sized text
128        //sets position   for printing (x and y)
129        carrier.display.setCursor(30, 70);
130        carrier.display.println("ACCEPTABLE");
131         carrier.leds.fill(colorYellow, 0, 5);
132        carrier.leds.show();
133         
134      }
135      
136      else if ((concentration > 1500 && concentration   < 6000) || (current_quality <= 500 && current_quality >= 300)) {
137        carrier.display.fillScreen(ST77XX_BLACK);   //black background
138        carrier.display.setTextColor(ST77XX_GREEN); //green   text
139        carrier.display.setTextSize(3); //medium sized text
140        //sets   position for printing (x and y)
141        carrier.display.setCursor(55, 70);
142         carrier.display.println("GOOD");
143        carrier.leds.fill(colorGreen,   0, 5);
144        carrier.leds.show();
145      }    
146      
147      else{
148         carrier.display.fillScreen(ST77XX_BLACK); //black background
149        carrier.display.setTextColor(ST77XX_WHITE);   //white text
150        carrier.display.setTextSize(3); //medium sized text
151         //sets position for printing (x and y)
152        carrier.display.setCursor(55,   70);
153        carrier.display.println("CLEAN");
154        carrier.leds.fill(colorWhite,   0, 5);
155        carrier.leds.show();
156      }
157      
158      if(fan_flag){
159         if(concentration > 6000 || current_quality >= 500) carrier.Relay1.open();
160         else carrier.Relay1.close(); 
161      } 
162      
163  }
164  
165  //   motion check
166  //pir_movement_state = digitalRead(pir_movement); 
167   
168   //if(pir_movement_state == HIGH) { // if motion detected
169  //  onMovementEventChange();
170   //}
171  
172  if(carrier.Button0.onTouchDown()) { // button press
173	  fan_flag   = !fan_flag;
174	  carrier.display.fillScreen(ST77XX_BLACK);
175    carrier.display.setTextColor(colorPurple);
176     carrier.display.setTextSize(2);
177	  if(fan_flag){
178      carrier.display.print("fan   mode is active");
179	  }
180	  else{
181	     carrier.display.print("fan mode   is off");
182	  }
183  }
184}
185
186void onMovementEventChange() {
187    carrier.leds.fill(colorPurple,   0, 5);
188    carrier.leds.show();  
189    carrier.display.fillScreen(ST77XX_BLACK);   //black background
190    carrier.display.setTextColor(colorPurple); //purple text
191     carrier.display.setTextSize(2); //medium sized text
192    //sets position for   printing (x and y)
193    carrier.display.setCursor(20, 40);
194    carrier.display.print("Temperature:   ");
195    carrier.display.println(temperature);
196    carrier.display.setCursor(20,   60);
197    carrier.display.print("Humidity: ");
198    carrier.display.println(humidity);
199     carrier.display.setCursor(20, 80);
200    carrier.display.print("concentration:   "); 
201    carrier.display.print(concentration);
202    carrier.display.println("   pcs/0.01cf");
203    carrier.display.setCursor(20, 100);
204    carrier.display.print("Air-Pollute   measure: "); 
205    carrier.display.print(current_quality);
206    delay(3000);
207}
208
209void   onHumidityChange() {
210  
211}
212
213void onTemperatureChange() {
214  // Do something
215}
216
217void   onConcentrationChange() {
218  // Do something
219}
220
221void onCurrentQualityChange()   {
222  // Do something
223}
224
225void onFanFlagChange() {
226  // Do something
227}
228

//#include"AirQuality.h"
#include "thingProperties.h"
#include   <Arduino_MKRIoTCarrier.h>
MKRIoTCarrier carrier;

//Colors
uint32_t   noColor = carrier.leds.Color( 0, 0, 0); // no color
uint32_t colorRed = carrier.leds.Color(0,   255, 0);   //RED
uint32_t colorGreen = carrier.leds.Color(255, 0, 0);  //GREEN
uint32_t   colorWhite = carrier.leds.Color( 255, 255, 255); // WHITE
uint32_t colorYellow   = carrier.leds.Color( 255, 255, 0); // yellow
uint32_t colorBlue = carrier.leds.Color(   0, 0, 255); // blue
uint32_t colorPurple = carrier.leds.Color( 255, 0, 255);   // purple

//int pir_movement = A4;
int pir_movement_state = 0;

int   pir_dust = A6;
int air_quality_sensor = A5 ;


unsigned long duration;
unsigned   long start_time;
unsigned long sample_time_ms = 3000;//sample 3s ;
unsigned   long low_pulse_occupancy = 0;
float ratio = 0;

void setup() {
  //   Initialize serial and wait for port to open:
  Serial.begin(9600);
 
  //   Defined in thingProperties.h
  initProperties();
 
  // Connect to Arduino   IoT Cloud
  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
  //Get Cloud   Info/errors , 0 (only errors) up to 4
  setDebugMessageLevel(2);
  ArduinoCloud.printDebugInfo();
   
  //Wait to get cloud connection to init the carrier
  while (ArduinoCloud.connected()   != 1) {
    ArduinoCloud.update();
    delay(500);
  }
 
  delay(500);
   CARRIER_CASE = false;
  carrier.begin();
  carrier.display.setRotation(0);
   delay(1000);
  pinMode(A5, INPUT);
  pinMode(A6, INPUT);
  //pinMode(A4,   INPUT);
  
  start_time = millis();
}

void loop() {
  ArduinoCloud.update();
   carrier.Buttons.update();

  temperature = carrier.Env.readTemperature();
   humidity = carrier.Env.readHumidity();
  Serial.print("Temperature: ");
   Serial.print(temperature);
  Serial.print(", Humidity: ");
  Serial.println(humidity);
   
  
  duration = pulseIn(pir_dust, LOW);
  low_pulse_occupancy = low_pulse_occupancy   + duration;
 
  if ((millis()-start_time) > sample_time_ms)//if the sampel   time == 3s
  {
      // operations on the dust sensor
      ratio = low_pulse_occupancy   / (sample_time_ms*10.0);  // Integer percentage 0=>100
      concentration =   1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
       Serial.print("concentration = ");
      Serial.print(concentration);
       Serial.println(" pcs/0.01cf  - ");
      low_pulse_occupancy = 0;
       start_time = millis();
      
      // operations on the air-pollution   sensor
      current_quality = analogRead(air_quality_sensor);
      if (current_quality   >= 1000){
        Serial.println("Very High Pollution!");
      }
      else   if (current_quality >= 700){
        Serial.println("High pollution!");
       }
      else if (current_quality >= 300){
        Serial.println("Low   pollution!");
      }
      else{
        Serial.println("Fresh air");
       }
      
      if((concentration > 6000) || (current_quality >= 1000)){
         carrier.display.fillScreen(ST77XX_BLACK); //black background
        carrier.display.setTextColor(ST77XX_BLUE);   //blue text
        carrier.display.setTextSize(3); //medium sized text
        //sets   position for printing (x and y)
        carrier.display.setCursor(45, 70);
         carrier.display.println("HAZARD!");
        carrier.leds.fill(colorBlue,   0, 5);
        carrier.leds.show();
        
      }
      
      else   if((concentration > 4500 && concentration < 10000) || (current_quality <= 1000 &&   current_quality >= 700)){
        carrier.display.fillScreen(ST77XX_BLACK); //black   background
        carrier.display.setTextColor(ST77XX_RED); //red text
        carrier.display.setTextSize(3);   //medium sized text
        //sets position for printing (x and y)
        carrier.display.setCursor(50,   70);
        carrier.display.println("HEAVY");
        carrier.leds.fill(colorRed,   0, 5);
        carrier.leds.show();
        
      }
      
      else   if ((concentration > 3000 && concentration < 8000) || (current_quality <= 700 &&   current_quality >= 500)){
        carrier.display.fillScreen(ST77XX_BLACK); //black   background
        carrier.display.setTextColor(ST77XX_YELLOW); //yellow text
         carrier.display.setTextSize(3); //medium sized text
        //sets position   for printing (x and y)
        carrier.display.setCursor(30, 70);
        carrier.display.println("ACCEPTABLE");
         carrier.leds.fill(colorYellow, 0, 5);
        carrier.leds.show();
         
      }
      
      else if ((concentration > 1500 && concentration   < 6000) || (current_quality <= 500 && current_quality >= 300)) {
        carrier.display.fillScreen(ST77XX_BLACK);   //black background
        carrier.display.setTextColor(ST77XX_GREEN); //green   text
        carrier.display.setTextSize(3); //medium sized text
        //sets   position for printing (x and y)
        carrier.display.setCursor(55, 70);
         carrier.display.println("GOOD");
        carrier.leds.fill(colorGreen,   0, 5);
        carrier.leds.show();
      }    
      
      else{
         carrier.display.fillScreen(ST77XX_BLACK); //black background
        carrier.display.setTextColor(ST77XX_WHITE);   //white text
        carrier.display.setTextSize(3); //medium sized text
         //sets position for printing (x and y)
        carrier.display.setCursor(55,   70);
        carrier.display.println("CLEAN");
        carrier.leds.fill(colorWhite,   0, 5);
        carrier.leds.show();
      }
      
      if(fan_flag){
         if(concentration > 6000 || current_quality >= 500) carrier.Relay1.open();
         else carrier.Relay1.close(); 
      } 
      
  }
  
  //   motion check
  //pir_movement_state = digitalRead(pir_movement); 
   
   //if(pir_movement_state == HIGH) { // if motion detected
  //  onMovementEventChange();
   //}
  
  if(carrier.Button0.onTouchDown()) { // button press
	  fan_flag   = !fan_flag;
	  carrier.display.fillScreen(ST77XX_BLACK);
    carrier.display.setTextColor(colorPurple);
     carrier.display.setTextSize(2);
	  if(fan_flag){
      carrier.display.print("fan   mode is active");
	  }
	  else{
	     carrier.display.print("fan mode   is off");
	  }
  }
}

void onMovementEventChange() {
    carrier.leds.fill(colorPurple,   0, 5);
    carrier.leds.show();  
    carrier.display.fillScreen(ST77XX_BLACK);   //black background
    carrier.display.setTextColor(colorPurple); //purple text
     carrier.display.setTextSize(2); //medium sized text
    //sets position for   printing (x and y)
    carrier.display.setCursor(20, 40);
    carrier.display.print("Temperature:   ");
    carrier.display.println(temperature);
    carrier.display.setCursor(20,   60);
    carrier.display.print("Humidity: ");
    carrier.display.println(humidity);
     carrier.display.setCursor(20, 80);
    carrier.display.print("concentration:   "); 
    carrier.display.print(concentration);
    carrier.display.println("   pcs/0.01cf");
    carrier.display.setCursor(20, 100);
    carrier.display.print("Air-Pollute   measure: "); 
    carrier.display.print(current_quality);
    delay(3000);
}

void   onHumidityChange() {
  
}

void onTemperatureChange() {
  // Do something
}

void   onConcentrationChange() {
  // Do something
}

void onCurrentQualityChange()   {
  // Do something
}

void onFanFlagChange() {
  // Do something
}

Code

c_cpp

1//#include"AirQuality.h"
2#include "thingProperties.h"
3#include  <Arduino_MKRIoTCarrier.h>
4MKRIoTCarrier carrier;
5
6//Colors
7uint32_t  noColor = carrier.leds.Color( 0, 0, 0); // no color
8uint32_t colorRed = carrier.leds.Color(0,  255, 0);   //RED
9uint32_t colorGreen = carrier.leds.Color(255, 0, 0);  //GREEN
10uint32_t  colorWhite = carrier.leds.Color( 255, 255, 255); // WHITE
11uint32_t colorYellow  = carrier.leds.Color( 255, 255, 0); // yellow
12uint32_t colorBlue = carrier.leds.Color(  0, 0, 255); // blue
13uint32_t colorPurple = carrier.leds.Color( 255, 0, 255);  // purple
14
15//int pir_movement = A4;
16int pir_movement_state = 0;
17
18int  pir_dust = A6;
19int air_quality_sensor = A5 ;
20
21
22unsigned long duration;
23unsigned  long start_time;
24unsigned long sample_time_ms = 3000;//sample 3s ;
25unsigned  long low_pulse_occupancy = 0;
26float ratio = 0;
27
28void setup() {
29  //  Initialize serial and wait for port to open:
30  Serial.begin(9600);
31 
32  //  Defined in thingProperties.h
33  initProperties();
34 
35  // Connect to Arduino  IoT Cloud
36  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
37  //Get Cloud  Info/errors , 0 (only errors) up to 4
38  setDebugMessageLevel(2);
39  ArduinoCloud.printDebugInfo();
40  
41  //Wait to get cloud connection to init the carrier
42  while (ArduinoCloud.connected()  != 1) {
43    ArduinoCloud.update();
44    delay(500);
45  }
46 
47  delay(500);
48  CARRIER_CASE = false;
49  carrier.begin();
50  carrier.display.setRotation(0);
51  delay(1000);
52  pinMode(A5, INPUT);
53  pinMode(A6, INPUT);
54  //pinMode(A4,  INPUT);
55  
56  start_time = millis();
57}
58
59void loop() {
60  ArduinoCloud.update();
61  carrier.Buttons.update();
62
63  temperature = carrier.Env.readTemperature();
64  humidity = carrier.Env.readHumidity();
65  Serial.print("Temperature: ");
66  Serial.print(temperature);
67  Serial.print(", Humidity: ");
68  Serial.println(humidity);
69  
70  
71  duration = pulseIn(pir_dust, LOW);
72  low_pulse_occupancy = low_pulse_occupancy  + duration;
73 
74  if ((millis()-start_time) > sample_time_ms)//if the sampel  time == 3s
75  {
76      // operations on the dust sensor
77      ratio = low_pulse_occupancy  / (sample_time_ms*10.0);  // Integer percentage 0=>100
78      concentration =  1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
79      Serial.print("concentration = ");
80      Serial.print(concentration);
81      Serial.println(" pcs/0.01cf  - ");
82      low_pulse_occupancy = 0;
83      start_time = millis();
84      
85      // operations on the air-pollution  sensor
86      current_quality = analogRead(air_quality_sensor);
87      if (current_quality  >= 1000){
88        Serial.println("Very High Pollution!");
89      }
90      else  if (current_quality >= 700){
91        Serial.println("High pollution!");
92      }
93      else if (current_quality >= 300){
94        Serial.println("Low  pollution!");
95      }
96      else{
97        Serial.println("Fresh air");
98      }
99      
100      if((concentration > 6000) || (current_quality >= 1000)){
101        carrier.display.fillScreen(ST77XX_BLACK); //black background
102        carrier.display.setTextColor(ST77XX_BLUE);  //blue text
103        carrier.display.setTextSize(3); //medium sized text
104        //sets  position for printing (x and y)
105        carrier.display.setCursor(45, 70);
106        carrier.display.println("HAZARD!");
107        carrier.leds.fill(colorBlue,  0, 5);
108        carrier.leds.show();
109        
110      }
111      
112      else  if((concentration > 4500 && concentration < 10000) || (current_quality <= 1000 &&  current_quality >= 700)){
113        carrier.display.fillScreen(ST77XX_BLACK); //black  background
114        carrier.display.setTextColor(ST77XX_RED); //red text
115        carrier.display.setTextSize(3);  //medium sized text
116        //sets position for printing (x and y)
117        carrier.display.setCursor(50,  70);
118        carrier.display.println("HEAVY");
119        carrier.leds.fill(colorRed,  0, 5);
120        carrier.leds.show();
121        
122      }
123      
124      else  if ((concentration > 3000 && concentration < 8000) || (current_quality <= 700 &&  current_quality >= 500)){
125        carrier.display.fillScreen(ST77XX_BLACK); //black  background
126        carrier.display.setTextColor(ST77XX_YELLOW); //yellow text
127        carrier.display.setTextSize(3); //medium sized text
128        //sets position  for printing (x and y)
129        carrier.display.setCursor(30, 70);
130        carrier.display.println("ACCEPTABLE");
131        carrier.leds.fill(colorYellow, 0, 5);
132        carrier.leds.show();
133        
134      }
135      
136      else if ((concentration > 1500 && concentration  < 6000) || (current_quality <= 500 && current_quality >= 300)) {
137        carrier.display.fillScreen(ST77XX_BLACK);  //black background
138        carrier.display.setTextColor(ST77XX_GREEN); //green  text
139        carrier.display.setTextSize(3); //medium sized text
140        //sets  position for printing (x and y)
141        carrier.display.setCursor(55, 70);
142        carrier.display.println("GOOD");
143        carrier.leds.fill(colorGreen,  0, 5);
144        carrier.leds.show();
145      }    
146      
147      else{
148        carrier.display.fillScreen(ST77XX_BLACK); //black background
149        carrier.display.setTextColor(ST77XX_WHITE);  //white text
150        carrier.display.setTextSize(3); //medium sized text
151        //sets position for printing (x and y)
152        carrier.display.setCursor(55,  70);
153        carrier.display.println("CLEAN");
154        carrier.leds.fill(colorWhite,  0, 5);
155        carrier.leds.show();
156      }
157      
158      if(fan_flag){
159        if(concentration > 6000 || current_quality >= 500) carrier.Relay1.open();
160        else carrier.Relay1.close(); 
161      } 
162      
163  }
164  
165  //  motion check
166  //pir_movement_state = digitalRead(pir_movement); 
167   
168  //if(pir_movement_state == HIGH) { // if motion detected
169  //  onMovementEventChange();
170  //}
171  
172  if(carrier.Button0.onTouchDown()) { // button press
173	  fan_flag  = !fan_flag;
174	  carrier.display.fillScreen(ST77XX_BLACK);
175    carrier.display.setTextColor(colorPurple);
176    carrier.display.setTextSize(2);
177	  if(fan_flag){
178      carrier.display.print("fan  mode is active");
179	  }
180	  else{
181	     carrier.display.print("fan mode  is off");
182	  }
183  }
184}
185
186void onMovementEventChange() {
187    carrier.leds.fill(colorPurple,  0, 5);
188    carrier.leds.show();  
189    carrier.display.fillScreen(ST77XX_BLACK);  //black background
190    carrier.display.setTextColor(colorPurple); //purple text
191    carrier.display.setTextSize(2); //medium sized text
192    //sets position for  printing (x and y)
193    carrier.display.setCursor(20, 40);
194    carrier.display.print("Temperature:  ");
195    carrier.display.println(temperature);
196    carrier.display.setCursor(20,  60);
197    carrier.display.print("Humidity: ");
198    carrier.display.println(humidity);
199    carrier.display.setCursor(20, 80);
200    carrier.display.print("concentration:  "); 
201    carrier.display.print(concentration);
202    carrier.display.println("  pcs/0.01cf");
203    carrier.display.setCursor(20, 100);
204    carrier.display.print("Air-Pollute  measure: "); 
205    carrier.display.print(current_quality);
206    delay(3000);
207}
208
209void  onHumidityChange() {
210  
211}
212
213void onTemperatureChange() {
214  // Do something
215}
216
217void  onConcentrationChange() {
218  // Do something
219}
220
221void onCurrentQualityChange()  {
222  // Do something
223}
224
225void onFanFlagChange() {
226  // Do something
227}
228

//#include"AirQuality.h"
#include "thingProperties.h"
#include  <Arduino_MKRIoTCarrier.h>
MKRIoTCarrier carrier;

//Colors
uint32_t  noColor = carrier.leds.Color( 0, 0, 0); // no color
uint32_t colorRed = carrier.leds.Color(0,  255, 0);   //RED
uint32_t colorGreen = carrier.leds.Color(255, 0, 0);  //GREEN
uint32_t  colorWhite = carrier.leds.Color( 255, 255, 255); // WHITE
uint32_t colorYellow  = carrier.leds.Color( 255, 255, 0); // yellow
uint32_t colorBlue = carrier.leds.Color(  0, 0, 255); // blue
uint32_t colorPurple = carrier.leds.Color( 255, 0, 255);  // purple

//int pir_movement = A4;
int pir_movement_state = 0;

int  pir_dust = A6;
int air_quality_sensor = A5 ;


unsigned long duration;
unsigned  long start_time;
unsigned long sample_time_ms = 3000;//sample 3s ;
unsigned  long low_pulse_occupancy = 0;
float ratio = 0;

void setup() {
  //  Initialize serial and wait for port to open:
  Serial.begin(9600);
 
  //  Defined in thingProperties.h
  initProperties();
 
  // Connect to Arduino  IoT Cloud
  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
  //Get Cloud  Info/errors , 0 (only errors) up to 4
  setDebugMessageLevel(2);
  ArduinoCloud.printDebugInfo();
  
  //Wait to get cloud connection to init the carrier
  while (ArduinoCloud.connected()  != 1) {
    ArduinoCloud.update();
    delay(500);
  }
 
  delay(500);
  CARRIER_CASE = false;
  carrier.begin();
  carrier.display.setRotation(0);
  delay(1000);
  pinMode(A5, INPUT);
  pinMode(A6, INPUT);
  //pinMode(A4,  INPUT);
  
  start_time = millis();
}

void loop() {
  ArduinoCloud.update();
  carrier.Buttons.update();

  temperature = carrier.Env.readTemperature();
  humidity = carrier.Env.readHumidity();
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(", Humidity: ");
  Serial.println(humidity);
  
  
  duration = pulseIn(pir_dust, LOW);
  low_pulse_occupancy = low_pulse_occupancy  + duration;
 
  if ((millis()-start_time) > sample_time_ms)//if the sampel  time == 3s
  {
      // operations on the dust sensor
      ratio = low_pulse_occupancy  / (sample_time_ms*10.0);  // Integer percentage 0=>100
      concentration =  1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
      Serial.print("concentration = ");
      Serial.print(concentration);
      Serial.println(" pcs/0.01cf  - ");
      low_pulse_occupancy = 0;
      start_time = millis();
      
      // operations on the air-pollution  sensor
      current_quality = analogRead(air_quality_sensor);
      if (current_quality  >= 1000){
        Serial.println("Very High Pollution!");
      }
      else  if (current_quality >= 700){
        Serial.println("High pollution!");
      }
      else if (current_quality >= 300){
        Serial.println("Low  pollution!");
      }
      else{
        Serial.println("Fresh air");
      }
      
      if((concentration > 6000) || (current_quality >= 1000)){
        carrier.display.fillScreen(ST77XX_BLACK); //black background
        carrier.display.setTextColor(ST77XX_BLUE);  //blue text
        carrier.display.setTextSize(3); //medium sized text
        //sets  position for printing (x and y)
        carrier.display.setCursor(45, 70);
        carrier.display.println("HAZARD!");
        carrier.leds.fill(colorBlue,  0, 5);
        carrier.leds.show();
        
      }
      
      else  if((concentration > 4500 && concentration < 10000) || (current_quality <= 1000 &&  current_quality >= 700)){
        carrier.display.fillScreen(ST77XX_BLACK); //black  background
        carrier.display.setTextColor(ST77XX_RED); //red text
        carrier.display.setTextSize(3);  //medium sized text
        //sets position for printing (x and y)
        carrier.display.setCursor(50,  70);
        carrier.display.println("HEAVY");
        carrier.leds.fill(colorRed,  0, 5);
        carrier.leds.show();
        
      }
      
      else  if ((concentration > 3000 && concentration < 8000) || (current_quality <= 700 &&  current_quality >= 500)){
        carrier.display.fillScreen(ST77XX_BLACK); //black  background
        carrier.display.setTextColor(ST77XX_YELLOW); //yellow text
        carrier.display.setTextSize(3); //medium sized text
        //sets position  for printing (x and y)
        carrier.display.setCursor(30, 70);
        carrier.display.println("ACCEPTABLE");
        carrier.leds.fill(colorYellow, 0, 5);
        carrier.leds.show();
        
      }
      
      else if ((concentration > 1500 && concentration  < 6000) || (current_quality <= 500 && current_quality >= 300)) {
        carrier.display.fillScreen(ST77XX_BLACK);  //black background
        carrier.display.setTextColor(ST77XX_GREEN); //green  text
        carrier.display.setTextSize(3); //medium sized text
        //sets  position for printing (x and y)
        carrier.display.setCursor(55, 70);
        carrier.display.println("GOOD");
        carrier.leds.fill(colorGreen,  0, 5);
        carrier.leds.show();
      }    
      
      else{
        carrier.display.fillScreen(ST77XX_BLACK); //black background
        carrier.display.setTextColor(ST77XX_WHITE);  //white text
        carrier.display.setTextSize(3); //medium sized text
        //sets position for printing (x and y)
        carrier.display.setCursor(55,  70);
        carrier.display.println("CLEAN");
        carrier.leds.fill(colorWhite,  0, 5);
        carrier.leds.show();
      }
      
      if(fan_flag){
        if(concentration > 6000 || current_quality >= 500) carrier.Relay1.open();
        else carrier.Relay1.close(); 
      } 
      
  }
  
  //  motion check
  //pir_movement_state = digitalRead(pir_movement); 
   
  //if(pir_movement_state == HIGH) { // if motion detected
  //  onMovementEventChange();
  //}
  
  if(carrier.Button0.onTouchDown()) { // button press
	  fan_flag  = !fan_flag;
	  carrier.display.fillScreen(ST77XX_BLACK);
    carrier.display.setTextColor(colorPurple);
    carrier.display.setTextSize(2);
	  if(fan_flag){
      carrier.display.print("fan  mode is active");
	  }
	  else{
	     carrier.display.print("fan mode  is off");
	  }
  }
}

void onMovementEventChange() {
    carrier.leds.fill(colorPurple,  0, 5);
    carrier.leds.show();  
    carrier.display.fillScreen(ST77XX_BLACK);  //black background
    carrier.display.setTextColor(colorPurple); //purple text
    carrier.display.setTextSize(2); //medium sized text
    //sets position for  printing (x and y)
    carrier.display.setCursor(20, 40);
    carrier.display.print("Temperature:  ");
    carrier.display.println(temperature);
    carrier.display.setCursor(20,  60);
    carrier.display.print("Humidity: ");
    carrier.display.println(humidity);
    carrier.display.setCursor(20, 80);
    carrier.display.print("concentration:  "); 
    carrier.display.print(concentration);
    carrier.display.println("  pcs/0.01cf");
    carrier.display.setCursor(20, 100);
    carrier.display.print("Air-Pollute  measure: "); 
    carrier.display.print(current_quality);
    delay(3000);
}

void  onHumidityChange() {
  
}

void onTemperatureChange() {
  // Do something
}

void  onConcentrationChange() {
  // Do something
}

void onCurrentQualityChange()  {
  // Do something
}

void onFanFlagChange() {
  // Do something
}

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Downloadable files