Air Quality Cheker

5 mm LED: Red

Buzzer

Arduino Nano

Resistor 220 ohm

Graphic OLED, 128 x 64

Breadboard (generic)

Arduino IDE

5 mm LED: Yellow

MQ135 Gas Sensor

AirQualityMonitoringCheckingofairqualitybymeasuringpollutionofamountofgasespresentinair.<h3 >CODE FOR PROJECT: </h3>/* Air Pollution Monitoring System using Arduino and MQ135 Air Quality Sensor www.Electroduino.com*/#include "MQ135.h"//OLED Display libraries#include <SPI.h>#include <Wire.h>#include <Adafruit_GFX.h>#include <Adafruit_SSD1306.h>#define SCREEN_WIDTH 128 // OLED display width, in pixels#define SCREEN_HEIGHT 64 // OLED display height, in pixels#define OLED_RESET 4 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);//In and Outint RedLed = 9;int GreenLed = 8;int Buzzer = 7;void setup(){pinMode(RedLed, OUTPUT); // initialize digital pin RedLed as an output.pinMode(GreenLed, OUTPUT); // initialize digital pin GreenLed as an output.pinMode(Buzzer, OUTPUT); // initialize digital pin Buzzer as an output.// Start serial communication between arduino and your computerSerial.begin(9600); //initialize with the I2C addr 0x3C (128x64)display.begin(SSD1306_SWITCHCAPVCC, 0x3C);display.clearDisplay();delay(10);// Print text on displaydisplay.clearDisplay();display.setTextSize(1);display.setTextColor(WHITE);display.setCursor(0, 0);display.println("ELECTRODUIN0"); // Print textdisplay.display();display.setTextSize(1);display.setTextColor(WHITE);display.setCursor(0, 20);display.println("Air Pollution");display.display();display.setTextSize(1);display.setTextColor(WHITE);display.setCursor(0, 35);display.println(" Monitoring");display.display();delay(2000);}void loop(){// Read Senso valueMQ135 gasSensor = MQ135(A0);float air_quality = gasSensor.getPPM();// Print Senso value on Serial Monitor WindowSerial.print("Air Quality: "); Serial.print(air_quality);Serial.println(" PPM"); Serial.println();//Print Senso value or Air Quality Index on OLED Displaydisplay.clearDisplay();display.setCursor(0, 0); //oled display positiondisplay.setTextSize(1);display.setTextColor(WHITE);display.println("Air Quality Index");display.setCursor(0, 20); //oled display positiondisplay.setTextSize(2);display.setTextColor(WHITE);display.print(air_quality);display.setTextSize(1);display.setTextColor(WHITE);display.println(" PPM");display.display();// when air quality value less than 1000PPM if (air_quality<=1000){digitalWrite(GreenLed, HIGH); // turn the Green LED ondigitalWrite(RedLed, LOW); // turn the Red LED offnoTone(Buzzer); // turn the Buzzer off// Print text on OLED Displaydisplay.setTextSize(2);display.setTextColor(WHITE);display.setCursor(0, 45);display.println("Fresh Air"); //Messagedisplay.display();delay(2000);}// when air quality value greater than 1000PPM & less than 2000PPM elseif( air_quality>=1000 && air_quality<=2000 ){digitalWrite(GreenLed, LOW); // turn the Green LED offdigitalWrite(RedLed, HIGH ); // turn the Red LED onnoTone(Buzzer); // turn the Buzzer off // Print text on OLED Displaydisplay.setTextSize(2);display.setTextColor(WHITE);display.setCursor(0, 45);display.println(" Poor Air"); //Messagedisplay.display();delay(2000); }// when air quality value greater than 2000PPM elseif (air_quality>=2000 ){digitalWrite(GreenLed, LOW); // turn the Green LED offdigitalWrite(RedLed, HIGH); // turn the Red LED ontone(Buzzer, 1000, 200); // turn the Buzzer on// Print text on OLED Displaydisplay.setTextSize(2);display.setTextColor(WHITE);display.setCursor(0, 45);display.println("Danger!!"); //Messagedisplay.display();delay(2000);}}

CICUIT DIAGRAM

Air Quality Cheker

Checking quality of air using MQ135 sensor and arduino nano.