Air Quality Monitor

1#include <SPI.h>
2#include <Wire.h>
3#include <Adafruit_GFX.h>
4#include  <Adafruit_SSD1306.h>
5#include <Fonts/FreeSans9pt7b.h>
6#include <Fonts/FreeMonoOblique9pt7b.h>
7#include  <DHT.h>
8#define SCREEN_WIDTH 128 // OLED display width, in pixels
9#define  SCREEN_HEIGHT 64 // OLED display height, in pixels
10
11#define OLED_RESET     4  // Reset pin # (or -1 if sharing Arduino reset pin)
12Adafruit_SSD1306 display(SCREEN_WIDTH,  SCREEN_HEIGHT, &Wire, OLED_RESET);
13
14#define sensor    A0 
15#define DHTPIN  2          // Digital pin 2
16#define DHTTYPE DHT11     // DHT 11
17
18int gasLevel  = 0;         //int variable for gas level
19String quality =""; 
20DHT dht(DHTPIN,  DHTTYPE);
21
22
23
24void sendSensor()
25{
26  float h = dht.readHumidity();
27  float t = dht.readTemperature();
28
29  if (isnan(h) || isnan(t)) {
30  Serial.println("Failed  to read from DHT sensor!");
31    return;
32  }
33  display.setTextColor(WHITE);
34  display.setTextSize(1);
35  display.setFont();
36  display.setCursor(0, 43);
37  display.println("Temp  :");
38  display.setCursor(80, 43);
39  display.println(t);
40  display.setCursor(114, 43);
41  display.println("C");
42  display.setCursor(0,  56);
43  display.println("RH    :");
44  display.setCursor(80, 56);
45  display.println(h);
46  display.setCursor(114, 56);
47  display.println("%");
48}
49
50void air_sensor()
51{
52  gasLevel = analogRead(sensor);
53
54  if(gasLevel<181){
55    quality = "  GOOD!";
56  }
57  else if (gasLevel >181 && gasLevel<225){
58    quality =  "  Poor!";
59  }
60  else if (gasLevel >225 && gasLevel<300){
61    quality  = "Very bad!";
62  }
63    else if (gasLevel >300 && gasLevel<350){
64    quality  = "ur dead!";
65  }
66    else{
67    quality = " Toxic";   
68}
69  
70  display.setTextColor(WHITE);
71  display.setTextSize(1);  
72  display.setCursor(1,5);
73  display.setFont();
74  display.println("Air Quality:");
75  display.setTextSize(1);
76  display.setCursor(20,23);
77  display.setFont(&FreeMonoOblique9pt7b);
78  display.println(quality);  
79}
80
81void setup() {
82  Serial.begin(9600);
83  pinMode(sensor,INPUT);
84  dht.begin();
85  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c)) { // Address  0x3D for 128x64
86    Serial.println(F("SSD1306 allocation failed"));
87}
88  display.clearDisplay();
89  display.setTextColor(WHITE);
90  
91  display.setTextSize(2);
92  display.setCursor(50, 0);
93  display.println("Air");
94  display.setTextSize(1);
95  display.setCursor(23, 20);
96  display.println("Qulaity monitor");
97  display.display();
98  delay(1200);
99  display.clearDisplay();
100  
101  display.setTextSize(2);
102  display.setCursor(20, 20);
103  display.println("BY Abid");
104  display.display();
105  delay(1000);
106  display.clearDisplay();    
107}
108
109void loop() {
110display.clearDisplay();
111air_sensor();
112sendSensor();
113display.display();  
114}
115